rule win_cobalt_strike_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.cobalt_strike"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { e9???????? eb0a b801000000 e9???????? }
            // n = 4, score = 1400
            //   e9????????           |                     
            //   eb0a                 | jmp                 0xc
            //   b801000000           | mov                 eax, 1
            //   e9????????           |                     

        $sequence_1 = { 3bc7 750d ff15???????? 3d33270000 }
            // n = 4, score = 1400
            //   3bc7                 | cmp                 eax, edi
            //   750d                 | jne                 0xf
            //   ff15????????         |                     
            //   3d33270000           | cmp                 eax, 0x2733

        $sequence_2 = { e8???????? e9???????? 833d????????01 7505 e8???????? }
            // n = 5, score = 1000
            //   e8????????           |                     
            //   e9????????           |                     
            //   833d????????01       |                     
            //   7505                 | dec                 eax
            //   e8????????           |                     

        $sequence_3 = { 8bd0 e8???????? 85c0 7e0e }
            // n = 4, score = 1000
            //   8bd0                 | mov                 edx, eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7e0e                 | jle                 0x10

        $sequence_4 = { 7504 5f 5e c9 c3 ff7508 }
            // n = 6, score = 900
            //   7504                 | jne                 0xf
            //   5f                   | cmp                 eax, 0x2733
            //   5e                   | jne                 7
            //   c9                   | jne                 7
            //   c3                   | jne                 7
            //   ff7508               | mov                 eax, dword ptr [ebp - 0x68]

        $sequence_5 = { 53 6a02 6800000040 8d85f8fbffff }
            // n = 4, score = 900
            //   53                   | xor                 edx, dword ptr [eax + 8]
            //   6a02                 | mov                 dword ptr [ebp - 0x20], edx
            //   6800000040           | mov                 eax, dword ptr [ebp - 0x20]
            //   8d85f8fbffff         | shr                 eax, 0x18

        $sequence_6 = { 57 8dbd48eeffff b96e040000 b8cccccccc f3ab }
            // n = 5, score = 900
            //   57                   | dec                 ecx
            //   8dbd48eeffff         | inc                 edi
            //   b96e040000           | jmp                 0xc
            //   b8cccccccc           | mov                 eax, 1
            //   f3ab                 | cmp                 eax, edi

        $sequence_7 = { e8???????? 6a00 56 6a02 e8???????? }
            // n = 5, score = 900
            //   e8????????           |                     
            //   6a00                 | lea                 edi, [ebp - 0x11b8]
            //   56                   | mov                 ecx, 0x46e
            //   6a02                 | mov                 eax, 0xcccccccc
            //   e8????????           |                     

        $sequence_8 = { 8b4598 335008 8955e0 8b45e0 c1e818 25ff000000 8b4d0c }
            // n = 7, score = 900
            //   8b4598               | mov                 ebp, dword ptr [esp + 0x40]
            //   335008               | dec                 eax
            //   8955e0               | mov                 esi, dword ptr [esp + 0x48]
            //   8b45e0               | inc                 edx
            //   c1e818               | dec                 ebp
            //   25ff000000           | inc                 ecx
            //   8b4d0c               | mov                 byte ptr [edi], al

        $sequence_9 = { 8b7518 8d4518 8d4b04 85ff 7e3e 83ff0f 7f39 }
            // n = 7, score = 900
            //   8b7518               | mov                 eax, edi
            //   8d4518               | dec                 eax
            //   8d4b04               | mov                 ecx, edi
            //   85ff                 | mov                 al, byte ptr [ecx]
            //   7e3e                 | and                 al, 0x1f
            //   83ff0f               | cmp                 al, 0xc
            //   7f39                 | jne                 0xfffffff2

        $sequence_10 = { 418bcc 4c8bf0 e8???????? 488be8 }
            // n = 4, score = 500
            //   418bcc               | lea                 edx, [esp + 0x20]
            //   4c8bf0               | dec                 esp
            //   e8????????           |                     
            //   488be8               | mov                 eax, edi

        $sequence_11 = { ffd5 488b5c2430 488b6c2440 488b742448 }
            // n = 4, score = 500
            //   ffd5                 | dec                 eax
            //   488b5c2430           | mov                 ecx, edi
            //   488b6c2440           | mov                 al, byte ptr [ecx]
            //   488b742448           | and                 al, 0x1f

        $sequence_12 = { ffc2 ffcd 418807 49ffc7 }
            // n = 4, score = 500
            //   ffc2                 | inc                 ecx
            //   ffcd                 | mov                 byte ptr [edi], al
            //   418807               | dec                 ecx
            //   49ffc7               | inc                 edi

        $sequence_13 = { 4c3bc3 7d21 492bd8 488d542430 498bce 4a8d1482 4c8bc3 }
            // n = 7, score = 500
            //   4c3bc3               | dec                 esp
            //   7d21                 | cmp                 eax, ebx
            //   492bd8               | jge                 0x23
            //   488d542430           | dec                 ecx
            //   498bce               | sub                 ebx, eax
            //   4a8d1482             | dec                 eax
            //   4c8bc3               | lea                 edx, [esp + 0x30]

        $sequence_14 = { 8a01 241f 3c0c 75ee }
            // n = 4, score = 500
            //   8a01                 | mov                 ebx, eax
            //   241f                 | test                eax, eax
            //   3c0c                 | jne                 0x4e
            //   75ee                 | dec                 eax

        $sequence_15 = { 8bd8 85c0 754c 488d542420 4c8bc7 488bcf }
            // n = 6, score = 500
            //   8bd8                 | dec                 ecx
            //   85c0                 | mov                 ecx, esi
            //   754c                 | dec                 edx
            //   488d542420           | lea                 edx, [edx + eax*4]
            //   4c8bc7               | dec                 esp
            //   488bcf               | mov                 eax, ebx

    condition:
        7 of them and filesize < 696320
}