rule win_cobalt_strike_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cobalt_strike"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 8bd0 e8???????? 85c0 7e0e }
            // n = 4, score = 1000
            //   8bd0                 | mov                 edx, eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7e0e                 | jle                 0x10

        $sequence_3 = { e8???????? e9???????? 833d????????01 7505 e8???????? }
            // n = 5, score = 1000
            //   e8????????           |                     
            //   e9????????           |                     
            //   833d????????01       |                     
            //   7505                 | mov                 ecx, edx
            //   e8????????           |                     

        $sequence_4 = { 8d8560efffff 59 8d7801 8a08 40 3acb }
            // n = 6, score = 900
            //   8d8560efffff         | lea                 eax, [ebp - 0x78]
            //   59                   | push                ebx
            //   8d7801               | push                eax
            //   8a08                 | movzx               ecx, byte ptr [eax + 0x10]
            //   40                   | and                 ecx, 0xff
            //   3acb                 | shl                 ecx, 0x18

        $sequence_5 = { 8945fc 8d4588 53 50 }
            // n = 4, score = 900
            //   8945fc               | mov                 ecx, dword ptr [ebx]
            //   8d4588               | cmp                 eax, edi
            //   53                   | jne                 0xf
            //   50                   | cmp                 eax, 0x2733

        $sequence_6 = { 0fb64810 81e1ff000000 c1e118 8b5508 0fb64211 25ff000000 c1e010 }
            // n = 7, score = 900
            //   0fb64810             | jmp                 0x13
            //   81e1ff000000         | mov                 eax, 1
            //   c1e118               | jne                 0x15
            //   8b5508               | jne                 0x17
            //   0fb64211             | jne                 0x19
            //   25ff000000           | je                  0x63
            //   c1e010               | mov                 ebx, dword ptr [ebp - 4]

        $sequence_7 = { 744d 8b5dfc 8d45e0 56 }
            // n = 4, score = 900
            //   744d                 | jne                 0x27
            //   8b5dfc               | dec                 eax
            //   8d45e0               | mov                 ecx, dword ptr [ebx]
            //   56                   | dec                 eax

        $sequence_8 = { 8b45f4 e9???????? 8d854cefffff 50 }
            // n = 4, score = 900
            //   8b45f4               | lea                 eax, [ebp - 0x20]
            //   e9????????           |                     
            //   8d854cefffff         | push                esi
            //   50                   | mov                 dword ptr [ebp - 4], eax

        $sequence_9 = { ff75f8 ff75f4 ff75fc e8???????? 83c410 8bc7 5f }
            // n = 7, score = 900
            //   ff75f8               | mov                 eax, dword ptr [edi + 4]
            //   ff75f4               | dec                 eax
            //   ff75fc               | add                 edi, eax
            //   e8????????           |                     
            //   83c410               | dec                 eax
            //   8bc7                 | mov                 ecx, dword ptr [ebp - 0x78]
            //   5f                   | mov                 ebx, eax

        $sequence_10 = { 498bea eb06 41bd01000000 8bf0 488bfd b940000000 }
            // n = 6, score = 500
            //   498bea               | add                 eax, 8
            //   eb06                 | inc                 edx
            //   41bd01000000         | dec                 ecx
            //   8bf0                 | cmp                 eax, eax
            //   488bfd               | jl                  0xfffffff5
            //   b940000000           | or                  eax, 0xffffffff

        $sequence_11 = { 4883c008 ffc2 493bc0 7cea 83c8ff c3 }
            // n = 6, score = 500
            //   4883c008             | jne                 0x40
            //   ffc2                 | dec                 eax
            //   493bc0               | lea                 ecx, [ebp - 0x21]
            //   7cea                 | inc                 ecx
            //   83c8ff               | mov                 edx, esi
            //   c3                   | dec                 eax

        $sequence_12 = { c1c806 33c8 8bc3 034c2470 03d1 418bca 0bcb }
            // n = 7, score = 500
            //   c1c806               | ret                 
            //   33c8                 | dec                 ecx
            //   8bc3                 | mov                 ebp, edx
            //   034c2470             | jmp                 8
            //   03d1                 | inc                 ecx
            //   418bca               | mov                 ebp, 1
            //   0bcb                 | mov                 esi, eax

        $sequence_13 = { 8bd3 e8???????? 85c0 753c 488d4ddf 418bd6 }
            // n = 6, score = 500
            //   8bd3                 | mov                 ecx, esi
            //   e8????????           |                     
            //   85c0                 | dec                 eax
            //   753c                 | mov                 ebx, dword ptr [esp + 0x30]
            //   488d4ddf             | mov                 edx, ebx
            //   418bd6               | test                eax, eax

        $sequence_14 = { 488bd5 488bce ff15???????? 488b5c2430 }
            // n = 4, score = 500
            //   488bd5               | dec                 eax
            //   488bce               | mov                 edx, ebp
            //   ff15????????         |                     
            //   488b5c2430           | dec                 eax

        $sequence_15 = { 81e1ff0f0000 6644010411 4d03ce 4885f6 759c 8b4704 4803f8 }
            // n = 7, score = 500
            //   81e1ff0f0000         | inc                 ecx
            //   6644010411           | mov                 ebp, 1
            //   4d03ce               | mov                 esi, eax
            //   4885f6               | dec                 eax
            //   759c                 | mov                 edi, ebp
            //   8b4704               | mov                 ecx, 0x40
            //   4803f8               | ror                 eax, 6

    condition:
        7 of them and filesize < 696320
}