rule win_smokeloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.smokeloader."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.smokeloader"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { ff15???????? 8d45f0 50 8d45e8 50 8d45e0 50 }
            // n = 7, score = 1300
            //   ff15????????         |                     
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax

        $sequence_1 = { ff15???????? 8bf0 8d45dc 50 6a00 }
            // n = 5, score = 1100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_2 = { 50 8d45e0 50 56 ff15???????? 56 ff15???????? }
            // n = 7, score = 1100
            //   50                   | push                eax
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_3 = { 50 6a00 53 ff15???????? 8d45f0 }
            // n = 5, score = 1100
            //   50                   | push                eax
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8d45f0               | lea                 eax, [ebp - 0x10]

        $sequence_4 = { 57 ff15???????? 6a00 6800000002 6a03 6a00 }
            // n = 6, score = 1100
            //   57                   | push                edi
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   6800000002           | push                0x2000000
            //   6a03                 | push                3
            //   6a00                 | push                0

        $sequence_5 = { 50 56 681f000f00 57 }
            // n = 4, score = 900
            //   50                   | push                eax
            //   56                   | push                esi
            //   681f000f00           | push                0xf001f
            //   57                   | push                edi

        $sequence_6 = { ff15???????? bf90010000 8bcf e8???????? }
            // n = 4, score = 900
            //   ff15????????         |                     
            //   bf90010000           | mov                 edi, 0x190
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_7 = { 56 8d45fc 50 57 57 6a19 }
            // n = 6, score = 900
            //   56                   | push                0
            //   8d45fc               | push                ebx
            //   50                   | lea                 eax, [ebp - 0x10]
            //   57                   | push                eax
            //   57                   | push                eax
            //   6a19                 | push                0

        $sequence_8 = { 0fb64405dc 50 8d45ec 50 }
            // n = 4, score = 900
            //   0fb64405dc           | push                edi
            //   50                   | inc                 ebx
            //   8d45ec               | cmp                 ebx, 0xf
            //   50                   | lea                 eax, [ebp - 0x10]

        $sequence_9 = { e8???????? 8bf0 8d45fc 50 ff75fc 56 }
            // n = 6, score = 900
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   56                   | push                esi

        $sequence_10 = { 668ce8 6685c0 7406 fe05???????? }
            // n = 4, score = 900
            //   668ce8               | lea                 eax, [ebp - 0x10]
            //   6685c0               | push                eax
            //   7406                 | lea                 eax, [ebp - 0x18]
            //   fe05????????         |                     

        $sequence_11 = { 740a 83c104 83f920 72f0 }
            // n = 4, score = 900
            //   740a                 | je                  0xb
            //   83c104               | mov                 ax, gs
            //   83f920               | test                ax, ax
            //   72f0                 | je                  0xb

        $sequence_12 = { 8b07 03c3 50 ff15???????? }
            // n = 4, score = 800
            //   8b07                 | lea                 eax, [ebp - 0x24]
            //   03c3                 | push                eax
            //   50                   | push                0
            //   ff15????????         |                     

        $sequence_13 = { 7507 33c0 e9???????? e8???????? b904010000 }
            // n = 5, score = 800
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   e8????????           |                     
            //   b904010000           | mov                 ecx, 0x104

        $sequence_14 = { ff15???????? 50 56 6a00 ff15???????? }
            // n = 5, score = 800
            //   ff15????????         |                     
            //   50                   | push                ebx
            //   56                   | lea                 eax, [ebp - 0x10]
            //   6a00                 | mov                 esi, eax
            //   ff15????????         |                     

        $sequence_15 = { 0fb6c2 03f0 23f1 8a443418 88443c18 88543418 0fb64c3c18 }
            // n = 7, score = 700
            //   0fb6c2               | lea                 eax, [ebp - 4]
            //   03f0                 | push                eax
            //   23f1                 | push                dword ptr [ebp - 4]
            //   8a443418             | push                esi
            //   88443c18             | push                0x19
            //   88543418             | je                  0xc
            //   0fb64c3c18           | add                 ecx, 4

        $sequence_16 = { 8802 fec0 42 3c7a }
            // n = 4, score = 700
            //   8802                 | push                eax
            //   fec0                 | lea                 eax, [ebp - 0x14]
            //   42                   | push                eax
            //   3c7a                 | mov                 esi, eax

        $sequence_17 = { 8bec 83ec24 8d45f4 53 56 }
            // n = 5, score = 700
            //   8bec                 | cmp                 ecx, 0x20
            //   83ec24               | jb                  0xfffffff8
            //   8d45f4               | mov                 esi, eax
            //   53                   | lea                 eax, [ebp - 4]
            //   56                   | push                eax

        $sequence_18 = { 31c0 66894603 8d8de8fdffff 50 50 }
            // n = 5, score = 500
            //   31c0                 | xor                 eax, eax
            //   66894603             | mov                 word ptr [esi + 3], ax
            //   8d8de8fdffff         | lea                 ecx, [ebp - 0x218]
            //   50                   | push                eax
            //   50                   | push                eax

        $sequence_19 = { 89c6 6804010000 56 57 }
            // n = 4, score = 500
            //   89c6                 | mov                 esi, eax
            //   6804010000           | push                0x104
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_20 = { 8b4514 898608020000 56 6aff }
            // n = 4, score = 500
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   898608020000         | mov                 dword ptr [esi + 0x208], eax
            //   56                   | push                esi
            //   6aff                 | push                -1

        $sequence_21 = { 8d95f0fdffff c70200000000 6800800000 52 51 }
            // n = 5, score = 500
            //   8d95f0fdffff         | lea                 edx, [ebp - 0x210]
            //   c70200000000         | mov                 dword ptr [edx], 0
            //   6800800000           | push                0x8000
            //   52                   | push                edx
            //   51                   | push                ecx

        $sequence_22 = { ffb5f0fdffff 50 53 e8???????? 8d8decfdffff }
            // n = 5, score = 500
            //   ffb5f0fdffff         | push                dword ptr [ebp - 0x210]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8d8decfdffff         | lea                 ecx, [ebp - 0x214]

        $sequence_23 = { 8d85f0fdffff 8b750c 8b7d10 50 57 }
            // n = 5, score = 500
            //   8d85f0fdffff         | lea                 eax, [ebp - 0x210]
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_24 = { c60653 56 6a00 6a00 6a00 }
            // n = 5, score = 500
            //   c60653               | mov                 byte ptr [esi], 0x53
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_25 = { 50 50 50 51 50 50 56 }
            // n = 7, score = 500
            //   50                   | push                eax
            //   50                   | push                eax
            //   50                   | push                eax
            //   51                   | push                ecx
            //   50                   | push                eax
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_26 = { 89cf fc b280 31db }
            // n = 4, score = 400
            //   89cf                 | mov                 edi, 0x190
            //   fc                   | mov                 ecx, edi
            //   b280                 | jne                 9
            //   31db                 | xor                 eax, eax

        $sequence_27 = { 60 89c6 89cf fc }
            // n = 4, score = 400
            //   60                   | dec                 eax
            //   89c6                 | mov                 ecx, eax
            //   89cf                 | dec                 eax
            //   fc                   | mov                 esi, eax

        $sequence_28 = { fc 5f 5e 5b }
            // n = 4, score = 400
            //   fc                   | mov                 byte ptr [ebp - 0xb], 0x74
            //   5f                   | mov                 ecx, dword ptr [ebp - 0x60]
            //   5e                   | mov                 edx, dword ptr [ebp - 0x64]
            //   5b                   | mov                 dword ptr [ecx + 0x58], edx

        $sequence_29 = { 30d0 aa e2f3 7505 }
            // n = 4, score = 400
            //   30d0                 | xor                 al, dl
            //   aa                   | stosb               byte ptr es:[edi], al
            //   e2f3                 | loop                0xfffffff5
            //   7505                 | jne                 7

        $sequence_30 = { 55 89e5 81ec5c060000 53 56 }
            // n = 5, score = 400
            //   55                   | push                ebp
            //   89e5                 | mov                 ebp, esp
            //   81ec5c060000         | sub                 esp, 0x65c
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_31 = { 4885c0 7405 2b5804 75da b001 488b5c2440 488b6c2448 }
            // n = 7, score = 300
            //   4885c0               | inc                 ebp
            //   7405                 | test                bh, bh
            //   2b5804               | je                  0xc
            //   75da                 | dec                 eax
            //   b001                 | arpl                word ptr [ebx + 0x3c], cx
            //   488b5c2440           | mov                 edi, dword ptr [ecx + ebx + 0x28]
            //   488b6c2448           | dec                 eax

        $sequence_32 = { 85d2 0f8ea5000000 895dec 8955e8 }
            // n = 4, score = 300
            //   85d2                 | dec                 ecx
            //   0f8ea5000000         | dec                 ebx
            //   895dec               | test                edx, edx
            //   8955e8               | jle                 0xab

        $sequence_33 = { 49 8d3c8c 8b37 4c }
            // n = 4, score = 300
            //   49                   | dec                 ecx
            //   8d3c8c               | lea                 edi, [esp + ecx*4]
            //   8b37                 | mov                 esi, dword ptr [edi]
            //   4c                   | dec                 esp

        $sequence_34 = { 4f 8d1c10 41 8b4b18 }
            // n = 4, score = 300
            //   4f                   | dec                 edi
            //   8d1c10               | lea                 ebx, [eax + edx]
            //   41                   | inc                 ecx
            //   8b4b18               | mov                 ecx, dword ptr [ebx + 0x18]

        $sequence_35 = { 4c8bc3 4889442420 ff15???????? 4584ff 740a 48634b3c 8b7c1928 }
            // n = 7, score = 300
            //   4c8bc3               | je                  0x1b
            //   4889442420           | lea                 edx, [eax + 1]
            //   ff15????????         |                     
            //   4584ff               | dec                 esp
            //   740a                 | mov                 eax, ebx
            //   48634b3c             | dec                 eax
            //   8b7c1928             | mov                 dword ptr [esp + 0x20], eax

        $sequence_36 = { 7421 81fe7f000001 7419 8d5001 ff15???????? }
            // n = 5, score = 300
            //   7421                 | mov                 dword ptr [ebp - 0x14], ebx
            //   81fe7f000001         | mov                 dword ptr [ebp - 0x18], edx
            //   7419                 | je                  0x23
            //   8d5001               | cmp                 esi, 0x100007f
            //   ff15????????         |                     

        $sequence_37 = { 55 89e5 81ec54040000 53 }
            // n = 4, score = 300
            //   55                   | xor                 eax, eax
            //   89e5                 | lodsb               al, byte ptr [esi]
            //   81ec54040000         | add                 edx, eax
            //   53                   | test                eax, eax

        $sequence_38 = { 03ca 0fb6c1 8a0c04 300f 48ffc7 49ffcb }
            // n = 6, score = 300
            //   03ca                 | add                 ecx, edx
            //   0fb6c1               | movzx               eax, cl
            //   8a0c04               | mov                 cl, byte ptr [esp + eax]
            //   300f                 | xor                 byte ptr [edi], cl
            //   48ffc7               | dec                 eax
            //   49ffcb               | inc                 edi

        $sequence_39 = { c1e205 01c2 31c0 ac }
            // n = 4, score = 300
            //   c1e205               | dec                 ebp
            //   01c2                 | add                 esp, eax
            //   31c0                 | dec                 ecx
            //   ac                   | dec                 ecx

        $sequence_40 = { 4c 01c7 8b048f 4c }
            // n = 4, score = 300
            //   4c                   | dec                 esp
            //   01c7                 | add                 edi, eax
            //   8b048f               | mov                 eax, dword ptr [edi + ecx*4]
            //   4c                   | dec                 esp

        $sequence_41 = { 8b4b18 45 8b6320 4d 01c4 ffc9 49 }
            // n = 7, score = 300
            //   8b4b18               | mov                 ecx, dword ptr [ebx + 0x18]
            //   45                   | inc                 ebp
            //   8b6320               | mov                 esp, dword ptr [ebx + 0x20]
            //   4d                   | dec                 ebp
            //   01c4                 | add                 esp, eax
            //   ffc9                 | dec                 ecx
            //   49                   | dec                 ecx

        $sequence_42 = { 31c0 ac 01c2 85c0 }
            // n = 4, score = 300
            //   31c0                 | xor                 eax, eax
            //   ac                   | lodsb               al, byte ptr [esi]
            //   01c2                 | add                 edx, eax
            //   85c0                 | test                eax, eax

        $sequence_43 = { 4c 01c7 668b0c4f 41 8b7b1c 4c 01c7 }
            // n = 7, score = 300
            //   4c                   | dec                 esp
            //   01c7                 | add                 edi, eax
            //   668b0c4f             | mov                 cx, word ptr [edi + ecx*2]
            //   41                   | inc                 ecx
            //   8b7b1c               | mov                 edi, dword ptr [ebx + 0x1c]
            //   4c                   | dec                 esp
            //   01c7                 | add                 edi, eax

        $sequence_44 = { 8b5590 895108 683174bc7f 8b45e4 50 }
            // n = 5, score = 200
            //   8b5590               | push                0xf001f
            //   895108               | push                edi
            //   683174bc7f           | movzx               eax, byte ptr [ebp + eax - 0x24]
            //   8b45e4               | push                eax
            //   50                   | lea                 eax, [ebp - 0x14]

        $sequence_45 = { 5b c9 c20800 55 89e5 83ec04 }
            // n = 6, score = 200
            //   5b                   | loop                0xfffffff6
            //   c9                   | jne                 0xb
            //   c20800               | je                  0xb
            //   55                   | xor                 al, dl
            //   89e5                 | stosb               byte ptr es:[edi], al
            //   83ec04               | loop                0xfffffff8

        $sequence_46 = { 85c0 7589 8b55fc 52 e8???????? 8be5 }
            // n = 6, score = 200
            //   85c0                 | push                eax
            //   7589                 | mov                 dword ptr [ebp - 0x5c], eax
            //   8b55fc               | mov                 edx, dword ptr [ebp - 0x70]
            //   52                   | mov                 dword ptr [ecx + 8], edx
            //   e8????????           |                     
            //   8be5                 | push                0x7fbc7431

        $sequence_47 = { e8???????? 8945b4 8b4da0 8b55b4 89514c 68a8edf2ce }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8945b4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b4da0               | push                eax
            //   8b55b4               | push                eax
            //   89514c               | push                9
            //   68a8edf2ce           | mov                 ecx, dword ptr [ebp - 0x54]

        $sequence_48 = { 8b55cc 895144 68d770a437 8b8578ffffff 50 e8???????? 8945a4 }
            // n = 7, score = 200
            //   8b55cc               | lea                 eax, [ebp - 4]
            //   895144               | push                eax
            //   68d770a437           | push                dword ptr [ebp - 4]
            //   8b8578ffffff         | push                esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8945a4               | push                esi

        $sequence_49 = { 89c2 8b453c 8b7c2878 01ef 8b7720 01ee 56 }
            // n = 7, score = 200
            //   89c2                 | xor                 ebx, ebx
            //   8b453c               | pushal              
            //   8b7c2878             | mov                 esi, eax
            //   01ef                 | mov                 edi, ecx
            //   8b7720               | cld                 
            //   01ee                 | mov                 dl, 0x80
            //   56                   | mov                 esi, eax

        $sequence_50 = { 01ee 56 ad 01e8 31c9 c1c108 3208 }
            // n = 7, score = 200
            //   01ee                 | sub                 esi, eax
            //   56                   | shr                 esi, 1
            //   ad                   | add                 esi, dword ptr [edi + 0x24]
            //   01e8                 | movzx               eax, word ptr [esi + ebp - 2]
            //   31c9                 | add                 esp, -0x30
            //   c1c108               | push                ds
            //   3208                 | push                ebx

        $sequence_51 = { 75f5 31d1 75ec 58 29c6 d1ee }
            // n = 6, score = 200
            //   75f5                 | add                 esi, ebp
            //   31d1                 | push                esi
            //   75ec                 | add                 eax, ebp
            //   58                   | pop                 esi
            //   29c6                 | ret                 
            //   d1ee                 | pushal              

        $sequence_52 = { 83c4d0 1e 53 56 }
            // n = 4, score = 200
            //   83c4d0               | mov                 edi, ecx
            //   1e                   | cld                 
            //   53                   | rol                 ecx, 8
            //   56                   | xor                 cl, byte ptr [eax]

        $sequence_53 = { 01e8 5e c3 60 89c6 }
            // n = 5, score = 200
            //   01e8                 | mov                 edi, ecx
            //   5e                   | cld                 
            //   c3                   | mov                 dl, 0x80
            //   60                   | xor                 ebx, ebx
            //   89c6                 | mov                 esi, eax

        $sequence_54 = { 50 6a09 8b4dac 51 e8???????? 8945b0 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   6a09                 | mov                 edx, dword ptr [ebp - 0x34]
            //   8b4dac               | mov                 dword ptr [ecx + 0x44], edx
            //   51                   | push                0x37a470d7
            //   e8????????           |                     
            //   8945b0               | mov                 eax, dword ptr [ebp - 0x88]

        $sequence_55 = { e8???????? 8945bc 8b4da0 8b55bc 8911 c645f46e c645f574 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8945bc               | push                edx
            //   8b4da0               | mov                 esp, ebp
            //   8b55bc               | mov                 dword ptr [ebp - 0x4c], eax
            //   8911                 | mov                 ecx, dword ptr [ebp - 0x60]
            //   c645f46e             | mov                 edx, dword ptr [ebp - 0x4c]
            //   c645f574             | mov                 dword ptr [ecx + 0x4c], edx

        $sequence_56 = { aa e2f3 7506 7404 }
            // n = 4, score = 200
            //   aa                   | push                ebx
            //   e2f3                 | leave               
            //   7506                 | ret                 0x10
            //   7404                 | push                ebp

        $sequence_57 = { 68afb61a39 8b45e4 50 e8???????? 8945c0 8b4da0 }
            // n = 6, score = 200
            //   68afb61a39           | push                ecx
            //   8b45e4               | mov                 dword ptr [ebp - 0x50], eax
            //   50                   | test                eax, eax
            //   e8????????           |                     
            //   8945c0               | jne                 0xffffff8d
            //   8b4da0               | mov                 edx, dword ptr [ebp - 4]

        $sequence_58 = { c1c108 3208 40 803800 }
            // n = 4, score = 200
            //   c1c108               | mov                 eax, dword ptr [ebp + 0x3c]
            //   3208                 | mov                 edi, dword ptr [eax + ebp + 0x78]
            //   40                   | add                 edi, ebp
            //   803800               | mov                 esi, dword ptr [edi + 0x20]

        $sequence_59 = { 8b4da0 8b559c 895158 682bed9b51 8b8578ffffff }
            // n = 5, score = 200
            //   8b4da0               | push                0xcef2eda8
            //   8b559c               | push                0x391ab6af
            //   895158               | mov                 eax, dword ptr [ebp - 0x1c]
            //   682bed9b51           | push                eax
            //   8b8578ffffff         | mov                 dword ptr [ebp - 0x40], eax

        $sequence_60 = { e8???????? d6 0055d0 28a9a228510b a2???????? a1???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   d6                   | xchg                eax, ebp
            //   0055d0               | aaa                 
            //   28a9a228510b         | jge                 0xe
            //   a2????????           |                     
            //   a1????????           |                     

        $sequence_61 = { fd 5d 5d 5d de9955d89d29 5a 9a18a15c5d5d5d }
            // n = 7, score = 100
            //   fd                   | je                  0xd
            //   5d                   | pop                 ebx
            //   5d                   | leave               
            //   5d                   | ret                 8
            //   de9955d89d29         | push                ebp
            //   5a                   | mov                 ebp, esp
            //   9a18a15c5d5d5d       | sub                 esp, 4

        $sequence_62 = { 189dd465d010 95 37 7d0a 37 5c }
            // n = 6, score = 100
            //   189dd465d010         | add                 ebx, ebp
            //   95                   | arpl                word ptr [ebp + 0x29], bx
            //   37                   | dec                 esp
            //   7d0a                 | or                  esp, dword ptr [edx - 0x6227baf2]
            //   37                   | push                edx
            //   5c                   | std                 

        $sequence_63 = { 6e a7 03b65759dcb3 197b5d 5d b658 5d }
            // n = 7, score = 100
            //   6e                   | pop                 ebp
            //   a7                   | pop                 ebp
            //   03b65759dcb3         | pop                 ebp
            //   197b5d               | ficomp              word ptr [ecx + 0x299dd855]
            //   5d                   | pop                 edx
            //   b658                 | lcall               0x5d5d:0x5d5ca118
            //   5d                   | sbb                 byte ptr [ebp + 0x10d065d4], bl

        $sequence_64 = { 03dd 635d29 4c 0ba20e45d89d 52 }
            // n = 5, score = 100
            //   03dd                 | jne                 0xd
            //   635d29               | xor                 al, dl
            //   4c                   | stosb               byte ptr es:[edi], al
            //   0ba20e45d89d         | loop                0xfffffff8
            //   52                   | jne                 0xd

    condition:
        7 of them and filesize < 245760
}