rule win_former_first_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.former_first_rat."
        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.former_first_rat"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 52 bb1c000000 8d742428 894c245c }
            // n = 4, score = 200
            //   52                   | push                edx
            //   bb1c000000           | mov                 ebx, 0x1c
            //   8d742428             | lea                 esi, [esp + 0x28]
            //   894c245c             | mov                 dword ptr [esp + 0x5c], ecx

        $sequence_1 = { e8???????? 8b3d???????? 8b0d???????? 69f608020000 03f1 eb13 3b3d???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b3d????????         |                     
            //   8b0d????????         |                     
            //   69f608020000         | imul                esi, esi, 0x208
            //   03f1                 | add                 esi, ecx
            //   eb13                 | jmp                 0x15
            //   3b3d????????         |                     

        $sequence_2 = { c78500efffff1c000000 8b85fceeffff 8bbd00efffff 03f8 8d4f20 8985f4eeffff 3bce }
            // n = 7, score = 200
            //   c78500efffff1c000000     | mov    dword ptr [ebp - 0x1100], 0x1c
            //   8b85fceeffff         | mov                 eax, dword ptr [ebp - 0x1104]
            //   8bbd00efffff         | mov                 edi, dword ptr [ebp - 0x1100]
            //   03f8                 | add                 edi, eax
            //   8d4f20               | lea                 ecx, [edi + 0x20]
            //   8985f4eeffff         | mov                 dword ptr [ebp - 0x110c], eax
            //   3bce                 | cmp                 ecx, esi

        $sequence_3 = { 837b0800 7421 897b04 8bbdd0fcffff 8b13 }
            // n = 5, score = 200
            //   837b0800             | cmp                 dword ptr [ebx + 8], 0
            //   7421                 | je                  0x23
            //   897b04               | mov                 dword ptr [ebx + 4], edi
            //   8bbdd0fcffff         | mov                 edi, dword ptr [ebp - 0x330]
            //   8b13                 | mov                 edx, dword ptr [ebx]

        $sequence_4 = { 85c0 7505 e8???????? 8d442410 50 6a02 ff15???????? }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax
            //   6a02                 | push                2
            //   ff15????????         |                     

        $sequence_5 = { 89bbe0000000 89bbdc000000 89bbd8000000 e8???????? 6808350000 e8???????? 83c410 }
            // n = 7, score = 200
            //   89bbe0000000         | mov                 dword ptr [ebx + 0xe0], edi
            //   89bbdc000000         | mov                 dword ptr [ebx + 0xdc], edi
            //   89bbd8000000         | mov                 dword ptr [ebx + 0xd8], edi
            //   e8????????           |                     
            //   6808350000           | push                0x3508
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_6 = { 8a08 40 84c9 75f9 2bc2 8d444706 }
            // n = 6, score = 200
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   40                   | inc                 eax
            //   84c9                 | test                cl, cl
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   8d444706             | lea                 eax, [edi + eax*2 + 6]

        $sequence_7 = { 40 89850cffffff 3b85f8feffff 0f82b2feffff 8bb508ffffff }
            // n = 5, score = 200
            //   40                   | inc                 eax
            //   89850cffffff         | mov                 dword ptr [ebp - 0xf4], eax
            //   3b85f8feffff         | cmp                 eax, dword ptr [ebp - 0x108]
            //   0f82b2feffff         | jb                  0xfffffeb8
            //   8bb508ffffff         | mov                 esi, dword ptr [ebp - 0xf8]

        $sequence_8 = { 03c1 89442468 413bc5 7250 }
            // n = 4, score = 100
            //   03c1                 | inc                 ecx
            //   89442468             | movzx               ecx, dl
            //   413bc5               | inc                 edx
            //   7250                 | xor                 dl, byte ptr [ecx + eax]

        $sequence_9 = { 03ca 0fb6c9 428a1401 4130143b }
            // n = 4, score = 100
            //   03ca                 | mov                 dword ptr [esp + 0x68], eax
            //   0fb6c9               | inc                 ecx
            //   428a1401             | cmp                 eax, ebp
            //   4130143b             | jb                  0x55

        $sequence_10 = { 02c8 488d05f0f60100 02c9 4002ce }
            // n = 4, score = 100
            //   02c8                 | mov                 eax, dword ptr [ecx + 0x10]
            //   488d05f0f60100       | cmp                 dword ptr [eax + 0x94], 0
            //   02c9                 | add                 cl, al
            //   4002ce               | dec                 eax

        $sequence_11 = { 017130 83793005 7407 33c0 }
            // n = 4, score = 100
            //   017130               | add                 dword ptr [ecx + 0x30], esi
            //   83793005             | cmp                 dword ptr [ecx + 0x30], 5
            //   7407                 | je                  9
            //   33c0                 | xor                 eax, eax

        $sequence_12 = { 03cd 8908 f6437804 7417 }
            // n = 4, score = 100
            //   03cd                 | jne                 0x1d
            //   8908                 | inc                 ecx
            //   f6437804             | mov                 eax, edx
            //   7417                 | add                 eax, edx

        $sequence_13 = { 03cf 8908 488b4340 48833800 }
            // n = 4, score = 100
            //   03cf                 | inc                 ecx
            //   8908                 | xor                 byte ptr [ebx + edi], dl
            //   488b4340             | add                 ecx, edx
            //   48833800             | movzx               ecx, cl

        $sequence_14 = { 03c2 83e003 3bc2 7516 418bc2 }
            // n = 5, score = 100
            //   03c2                 | mov                 byte ptr [ebx], dl
            //   83e003               | inc                 edx
            //   3bc2                 | xor                 byte ptr [ecx + eax], dl
            //   7516                 | inc                 edx
            //   418bc2               | mov                 cl, byte ptr [ecx + eax]

        $sequence_15 = { 02ca 4402d1 410fb6ca 42321401 }
            // n = 4, score = 100
            //   02ca                 | dec                 eax
            //   4402d1               | cmp                 edi, eax
            //   410fb6ca             | add                 cl, al
            //   42321401             | dec                 eax

    condition:
        7 of them and filesize < 626688
}