rule win_cobint_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.cobint."
        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.cobint"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 83c410 33c0 5d c3 55 8bec 837d0c08 }
            // n = 7, score = 400
            //   83c410               | add                 esp, 0x10
            //   33c0                 | xor                 eax, eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0c08             | cmp                 dword ptr [ebp + 0xc], 8

        $sequence_1 = { 59 59 50 ff35???????? ff15???????? ff35???????? }
            // n = 6, score = 400
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   ff35????????         |                     

        $sequence_2 = { 0f8cd3000000 8b543104 83c0fc 8955f8 3bc2 }
            // n = 5, score = 400
            //   0f8cd3000000         | jl                  0xd9
            //   8b543104             | mov                 edx, dword ptr [ecx + esi + 4]
            //   83c0fc               | add                 eax, -4
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   3bc2                 | cmp                 eax, edx

        $sequence_3 = { ff750c 890f 8b4d14 894f04 }
            // n = 4, score = 400
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   890f                 | mov                 dword ptr [edi], ecx
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   894f04               | mov                 dword ptr [edi + 4], ecx

        $sequence_4 = { 8b5d08 33c0 56 8b750c 8bc8 57 8906 }
            // n = 7, score = 400
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8bc8                 | mov                 ecx, eax
            //   57                   | push                edi
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_5 = { c745f404000000 50 8d4508 50 6805000020 }
            // n = 5, score = 400
            //   c745f404000000       | mov                 dword ptr [ebp - 0xc], 4
            //   50                   | push                eax
            //   8d4508               | lea                 eax, [ebp + 8]
            //   50                   | push                eax
            //   6805000020           | push                0x20000005

        $sequence_6 = { a1???????? 40 251f000080 7905 48 83c8e0 40 }
            // n = 7, score = 400
            //   a1????????           |                     
            //   40                   | inc                 eax
            //   251f000080           | and                 eax, 0x8000001f
            //   7905                 | jns                 7
            //   48                   | dec                 eax
            //   83c8e0               | or                  eax, 0xffffffe0
            //   40                   | inc                 eax

        $sequence_7 = { 8bd7 391a 740b 41 83c210 83f920 }
            // n = 6, score = 400
            //   8bd7                 | mov                 edx, edi
            //   391a                 | cmp                 dword ptr [edx], ebx
            //   740b                 | je                  0xd
            //   41                   | inc                 ecx
            //   83c210               | add                 edx, 0x10
            //   83f920               | cmp                 ecx, 0x20

        $sequence_8 = { 33db 8a06 8d7602 3c61 7202 04e0 }
            // n = 6, score = 200
            //   33db                 | xor                 ebx, ebx
            //   8a06                 | mov                 al, byte ptr [esi]
            //   8d7602               | lea                 esi, [esi + 2]
            //   3c61                 | cmp                 al, 0x61
            //   7202                 | jb                  4
            //   04e0                 | add                 al, 0xe0

        $sequence_9 = { 83ec14 53 56 8bf1 8955f0 33d2 57 }
            // n = 7, score = 200
            //   83ec14               | sub                 esp, 0x14
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx
            //   33d2                 | xor                 edx, edx
            //   57                   | push                edi

        $sequence_10 = { 7c90 90 90 90 90 90 }
            // n = 6, score = 200
            //   7c90                 | jl                  0xffffff92
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 

        $sequence_11 = { 90 90 bffc807c28 1a807c170e81 7cd7 }
            // n = 5, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   bffc807c28           | mov                 edi, 0x287c80fc
            //   1a807c170e81         | sbb                 al, byte ptr [eax - 0x7ef1e884]
            //   7cd7                 | jl                  0xffffffd9

        $sequence_12 = { 7cd7 9b 807c909090 90 90 }
            // n = 5, score = 200
            //   7cd7                 | jl                  0xffffffd9
            //   9b                   | wait                
            //   807c909090           | cmp                 byte ptr [eax + edx*4 - 0x70], 0x90
            //   90                   | nop                 
            //   90                   | nop                 

        $sequence_13 = { 8975f4 85c0 7505 b301 }
            // n = 4, score = 200
            //   8975f4               | mov                 dword ptr [ebp - 0xc], esi
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   b301                 | mov                 bl, 1

        $sequence_14 = { 8802 eb0b 8b4d08 034df0 8a55ed 8811 }
            // n = 6, score = 200
            //   8802                 | mov                 byte ptr [edx], al
            //   eb0b                 | jmp                 0xd
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   034df0               | add                 ecx, dword ptr [ebp - 0x10]
            //   8a55ed               | mov                 dl, byte ptr [ebp - 0x13]
            //   8811                 | mov                 byte ptr [ecx], dl

        $sequence_15 = { 8d4dec 8945f8 51 6800a80000 56 53 }
            // n = 6, score = 200
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   51                   | push                ecx
            //   6800a80000           | push                0xa800
            //   56                   | push                esi
            //   53                   | push                ebx

        $sequence_16 = { 8b400c 8b5014 33c0 eb38 }
            // n = 4, score = 200
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   8b5014               | mov                 edx, dword ptr [eax + 0x14]
            //   33c0                 | xor                 eax, eax
            //   eb38                 | jmp                 0x3a

        $sequence_17 = { 90 90 90 749b 807ce19a80 7c90 90 }
            // n = 7, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   749b                 | je                  0xffffff9d
            //   807ce19a80           | cmp                 byte ptr [ecx - 0x66], 0x80
            //   7c90                 | jl                  0xffffff92
            //   90                   | nop                 

        $sequence_18 = { 837d1000 740d 8b5508 0355f0 8a45ec }
            // n = 5, score = 200
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   740d                 | je                  0xf
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0355f0               | add                 edx, dword ptr [ebp - 0x10]
            //   8a45ec               | mov                 al, byte ptr [ebp - 0x14]

        $sequence_19 = { 807c909090 90 bdfd807c90 90 }
            // n = 4, score = 200
            //   807c909090           | cmp                 byte ptr [eax + edx*4 - 0x70], 0x90
            //   90                   | nop                 
            //   bdfd807c90           | mov                 ebp, 0x907c80fd
            //   90                   | nop                 

        $sequence_20 = { 47 8d1c08 8a07 84c0 75ec 895df8 8b5df4 }
            // n = 7, score = 200
            //   47                   | inc                 edi
            //   8d1c08               | lea                 ebx, [eax + ecx]
            //   8a07                 | mov                 al, byte ptr [edi]
            //   84c0                 | test                al, al
            //   75ec                 | jne                 0xffffffee
            //   895df8               | mov                 dword ptr [ebp - 8], ebx
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]

        $sequence_21 = { 58 83c005 c3 31b7807c30ae 807c909090 }
            // n = 5, score = 200
            //   58                   | pop                 eax
            //   83c005               | add                 eax, 5
            //   c3                   | ret                 
            //   31b7807c30ae         | xor                 dword ptr [edi - 0x51cf8380], esi
            //   807c909090           | cmp                 byte ptr [eax + edx*4 - 0x70], 0x90

        $sequence_22 = { 8945ec 395318 763c 8b3c90 33c0 03fe }
            // n = 6, score = 200
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   395318               | cmp                 dword ptr [ebx + 0x18], edx
            //   763c                 | jbe                 0x3e
            //   8b3c90               | mov                 edi, dword ptr [eax + edx*4]
            //   33c0                 | xor                 eax, eax
            //   03fe                 | add                 edi, esi

        $sequence_23 = { 33d2 8b3e 83e0fc 42 }
            // n = 4, score = 200
            //   33d2                 | xor                 edx, edx
            //   8b3e                 | mov                 edi, dword ptr [esi]
            //   83e0fc               | and                 eax, 0xfffffffc
            //   42                   | inc                 edx

    condition:
        7 of them and filesize < 65536
}