rule win_cobalt_strike_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cobalt_strike"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 3bc7 750d ff15???????? 3d33270000 }
            // n = 4, score = 1400
            //   3bc7                 | cmp                 eax, edi
            //   750d                 | jne                 0xf
            //   ff15????????         |                     
            //   3d33270000           | cmp                 eax, 0x2733

        $sequence_1 = { e9???????? eb0a b801000000 e9???????? }
            // n = 4, score = 1400
            //   e9????????           |                     
            //   eb0a                 | jmp                 0xc
            //   b801000000           | mov                 eax, 1
            //   e9????????           |                     

        $sequence_2 = { e9???????? 833d????????01 7505 e8???????? }
            // n = 4, score = 1000
            //   e9????????           |                     
            //   833d????????01       |                     
            //   7505                 | cmp                 ecx, 7
            //   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 = { ff15???????? ff7508 e8???????? 83c8ff ebe4 }
            // n = 5, score = 900
            //   ff15????????         |                     
            //   ff7508               | je                  9
            //   e8????????           |                     
            //   83c8ff               | cmp                 word ptr [eax + 0xa], 4
            //   ebe4                 | pop                 eax

        $sequence_5 = { 6a17 8bc6 e8???????? 50 8bc6 e8???????? 50 }
            // n = 7, score = 900
            //   6a17                 | dec                 ecx
            //   8bc6                 | cmp                 eax, edi
            //   e8????????           |                     
            //   50                   | jne                 0xf
            //   8bc6                 | cmp                 eax, 0x2733
            //   e8????????           |                     
            //   50                   | jmp                 0xc

        $sequence_6 = { 8bf0 8975f8 3bf3 746d 8d45cc }
            // n = 5, score = 900
            //   8bf0                 | mov                 eax, 1
            //   8975f8               | jne                 7
            //   3bf3                 | jne                 7
            //   746d                 | jne                 7
            //   8d45cc               | push                0x17

        $sequence_7 = { ff7508 ff15???????? 85c0 7407 6683780a04 }
            // n = 5, score = 900
            //   ff7508               | mov                 eax, esi
            //   ff15????????         |                     
            //   85c0                 | push                eax
            //   7407                 | mov                 eax, esi
            //   6683780a04           | push                eax

        $sequence_8 = { 884107 8b45b0 c1e818 0fb6c8 8b55a4 }
            // n = 5, score = 900
            //   884107               | mov                 eax, dword ptr [ebp - 0x20]
            //   8b45b0               | cmp                 eax, edi
            //   c1e818               | jne                 0xf
            //   0fb6c8               | cmp                 eax, 0x2733
            //   8b55a4               | jmp                 0xc

        $sequence_9 = { 58 eb55 83fe03 75f6 c1e106 0fb6d2 0bca }
            // n = 7, score = 900
            //   58                   | mov                 esi, eax
            //   eb55                 | mov                 dword ptr [ebp - 8], esi
            //   83fe03               | cmp                 esi, ebx
            //   75f6                 | je                  0x71
            //   c1e106               | lea                 eax, [ebp - 0x34]
            //   0fb6d2               | push                dword ptr [ebp + 8]
            //   0bca                 | test                eax, eax

        $sequence_10 = { ffc1 83240200 488d5204 3b0b 7cee }
            // n = 5, score = 500
            //   ffc1                 | dec                 eax
            //   83240200             | lea                 ecx, [ebp - 9]
            //   488d5204             | add                 edx, 2
            //   3b0b                 | inc                 ecx
            //   7cee                 | and                 dword ptr [edx + eax], 0

        $sequence_11 = { 8bda e8???????? ba00400000 488bc8 4c8bf8 e8???????? }
            // n = 6, score = 500
            //   8bda                 | jge                 0x12
            //   e8????????           |                     
            //   ba00400000           | dec                 ecx
            //   488bc8               | mov                 ecx, eax
            //   4c8bf8               | test                eax, eax
            //   e8????????           |                     

        $sequence_12 = { 418bc1 e9???????? 418b16 488d4df7 83c202 }
            // n = 5, score = 500
            //   418bc1               | inc                 ecx
            //   e9????????           |                     
            //   418b16               | mov                 eax, ecx
            //   488d4df7             | inc                 ecx
            //   83c202               | mov                 edx, dword ptr [esi]

        $sequence_13 = { 75ee 8a4101 4533d2 84c0 792f 0fb6d0 }
            // n = 6, score = 500
            //   75ee                 | dec                 eax
            //   8a4101               | lea                 edx, [edx + 4]
            //   4533d2               | cmp                 ecx, dword ptr [ebx]
            //   84c0                 | jl                  0xfffffff0
            //   792f                 | jne                 0xfffffff0
            //   0fb6d0               | mov                 al, byte ptr [ecx + 1]

        $sequence_14 = { 8bda e8???????? 41bd00200000 488bc8 418bd5 }
            // n = 5, score = 500
            //   8bda                 | mov                 edx, ecx
            //   e8????????           |                     
            //   41bd00200000         | jmp                 0xc
            //   488bc8               | mov                 eax, 1
            //   418bd5               | cmp                 eax, edi

        $sequence_15 = { 7d10 498bc8 e8???????? 85c0 0f85e9000000 418b07 }
            // n = 6, score = 500
            //   7d10                 | inc                 ebp
            //   498bc8               | xor                 edx, edx
            //   e8????????           |                     
            //   85c0                 | test                al, al
            //   0f85e9000000         | jns                 0x39
            //   418b07               | movzx               edx, al

    condition:
        7 of them and filesize < 696320
}