rule win_vobfus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.vobfus."
        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.vobfus"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b5508 8b92e8000000 8b8298060000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b8298060000         | mov                 eax, dword ptr [edx + 0x698]
            //   50                   | push                eax

        $sequence_1 = { 8b5508 8b92e8000000 8b8248230000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b8248230000         | mov                 eax, dword ptr [edx + 0x2348]
            //   50                   | push                eax

        $sequence_2 = { 8b5508 8b92e8000000 8b82ac0a0000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b82ac0a0000         | mov                 eax, dword ptr [edx + 0xaac]
            //   50                   | push                eax

        $sequence_3 = { 8b5508 8b92e8000000 8b82800c0000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b82800c0000         | mov                 eax, dword ptr [edx + 0xc80]
            //   50                   | push                eax

        $sequence_4 = { 8b5508 8b92e8000000 8b82ac010000 50 50 8b10 ff5204 }
            // n = 7, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b82ac010000         | mov                 eax, dword ptr [edx + 0x1ac]
            //   50                   | push                eax
            //   50                   | push                eax
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   ff5204               | call                dword ptr [edx + 4]

        $sequence_5 = { 8b5508 8b92e8000000 8b8200110000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b8200110000         | mov                 eax, dword ptr [edx + 0x1100]
            //   50                   | push                eax

        $sequence_6 = { 8bec 8b5508 8b92e8000000 8b8218020000 50 }
            // n = 5, score = 200
            //   8bec                 | mov                 ebp, esp
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b8218020000         | mov                 eax, dword ptr [edx + 0x218]
            //   50                   | push                eax

        $sequence_7 = { 8b5508 8b92e8000000 8b82a80b0000 50 }
            // n = 4, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b92e8000000         | mov                 edx, dword ptr [edx + 0xe8]
            //   8b82a80b0000         | mov                 eax, dword ptr [edx + 0xba8]
            //   50                   | push                eax

        $sequence_8 = { bdb000d6c2 91 00d5 c19400d6c49500d7 }
            // n = 4, score = 100
            //   bdb000d6c2           | mov                 ebp, 0xc2d600b0
            //   91                   | xchg                eax, ecx
            //   00d5                 | add                 ch, dl
            //   c19400d6c49500d7     | rcl                 dword ptr [eax + eax + 0x95c4d6], 0xd7

        $sequence_9 = { ec f3ed ebf2 ed }
            // n = 4, score = 100
            //   ec                   | in                  al, dx
            //   f3ed                 | in                  eax, dx
            //   ebf2                 | jmp                 0xfffffff4
            //   ed                   | in                  eax, dx

        $sequence_10 = { 57 de0d???????? f5 24c0 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   de0d????????         |                     
            //   f5                   | cmc                 
            //   24c0                 | and                 al, 0xc0

        $sequence_11 = { 3dae8602f8 0853ac 866cedad b909dfd18c 9d 7454 2bcd }
            // n = 7, score = 100
            //   3dae8602f8           | cmp                 eax, 0xf80286ae
            //   0853ac               | or                  byte ptr [ebx - 0x54], dl
            //   866cedad             | xchg                byte ptr [ebp + ebp*8 - 0x53], ch
            //   b909dfd18c           | mov                 ecx, 0x8cd1df09
            //   9d                   | popfd               
            //   7454                 | je                  0x56
            //   2bcd                 | sub                 ecx, ebp

        $sequence_12 = { 0d50004900 3e3cff 46 14ff 0470 }
            // n = 5, score = 100
            //   0d50004900           | or                  eax, 0x490050
            //   3e3cff               | cmp                 al, 0xff
            //   46                   | inc                 esi
            //   14ff                 | adc                 al, 0xff
            //   0470                 | add                 al, 0x70

        $sequence_13 = { f2e8fae6d5f6 d2b5f2bb8ff3 ae 73f3 aa 5c }
            // n = 6, score = 100
            //   f2e8fae6d5f6         | bnd call            0xf6d5e700
            //   d2b5f2bb8ff3         | sal                 byte ptr [ebp - 0xc70440e], cl
            //   ae                   | scasb               al, byte ptr es:[edi]
            //   73f3                 | jae                 0xfffffff5
            //   aa                   | stosb               byte ptr es:[edi], al
            //   5c                   | pop                 esp

        $sequence_14 = { aa 5c f6ac4ff8b54ffb c058fcca 61 }
            // n = 5, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   5c                   | pop                 esp
            //   f6ac4ff8b54ffb       | imul                byte ptr [edi + ecx*2 - 0x4b04a08]
            //   c058fcca             | rcr                 byte ptr [eax - 4], 0xca
            //   61                   | popal               

        $sequence_15 = { 14ff 0470 fe0a d6 }
            // n = 4, score = 100
            //   14ff                 | adc                 al, 0xff
            //   0470                 | add                 al, 0x70
            //   fe0a                 | dec                 byte ptr [edx]
            //   d6                   | salc                

        $sequence_16 = { 00e0 d4b4 00d1 c9 c200d5 cdc5 00d8 }
            // n = 7, score = 100
            //   00e0                 | add                 al, ah
            //   d4b4                 | aam                 0xb4
            //   00d1                 | add                 cl, dl
            //   c9                   | leave               
            //   c200d5               | ret                 0xd500
            //   cdc5                 | int                 0xc5
            //   00d8                 | add                 al, bl

        $sequence_17 = { 1400 48 0008 78ff 0d50004900 3e3cff }
            // n = 6, score = 100
            //   1400                 | adc                 al, 0
            //   48                   | dec                 eax
            //   0008                 | add                 byte ptr [eax], cl
            //   78ff                 | js                  1
            //   0d50004900           | or                  eax, 0x490050
            //   3e3cff               | cmp                 al, 0xff

        $sequence_18 = { d127 8b8ec9322003 26c1a5d9924bb222 56 a1???????? ec 54 }
            // n = 7, score = 100
            //   d127                 | shl                 dword ptr [edi], 1
            //   8b8ec9322003         | mov                 ecx, dword ptr [esi + 0x32032c9]
            //   26c1a5d9924bb222     | shl                 dword ptr es:[ebp - 0x4db46d27], 0x22
            //   56                   | push                esi
            //   a1????????           |                     
            //   ec                   | in                  al, dx
            //   54                   | push                esp

        $sequence_19 = { f2ed ec f2ed ec f2ed }
            // n = 5, score = 100
            //   f2ed                 | in                  eax, dx
            //   ec                   | in                  al, dx
            //   f2ed                 | in                  eax, dx
            //   ec                   | in                  al, dx
            //   f2ed                 | in                  eax, dx

        $sequence_20 = { 7cc8 dc7acd e291 d2e8 }
            // n = 4, score = 100
            //   7cc8                 | jl                  0xffffffca
            //   dc7acd               | fdivr               qword ptr [edx - 0x33]
            //   e291                 | loop                0xffffff93
            //   d2e8                 | shr                 al, cl

        $sequence_21 = { 0006 3401 41 06 1001 ff06 }
            // n = 6, score = 100
            //   0006                 | add                 byte ptr [esi], al
            //   3401                 | xor                 al, 1
            //   41                   | inc                 ecx
            //   06                   | push                es
            //   1001                 | adc                 byte ptr [ecx], al
            //   ff06                 | inc                 dword ptr [esi]

        $sequence_22 = { 66f2eb32 8631 96 0a7f25 }
            // n = 4, score = 100
            //   66f2eb32             | bnd jmp             0x36
            //   8631                 | xchg                byte ptr [ecx], dh
            //   96                   | xchg                eax, esi
            //   0a7f25               | or                  bh, byte ptr [edi + 0x25]

        $sequence_23 = { 8161d356b32dee 57 7df8 ab }
            // n = 4, score = 100
            //   8161d356b32dee       | and                 dword ptr [ecx - 0x2d], 0xee2db356
            //   57                   | push                edi
            //   7df8                 | jge                 0xfffffffa
            //   ab                   | stosd               dword ptr es:[edi], eax

    condition:
        7 of them and filesize < 409600
}