rule win_smac_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.smac."
        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.smac"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 83f908 7229 f3a5 ff2495c08c4000 8bc7 ba03000000 }
            // n = 6, score = 200
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495c08c4000       | jmp                 dword ptr [edx*4 + 0x408cc0]
            //   8bc7                 | mov                 eax, edi
            //   ba03000000           | mov                 edx, 3

        $sequence_1 = { 53 50 e8???????? 83c40c 6804010000 8d842418010000 50 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6804010000           | push                0x104
            //   8d842418010000       | lea                 eax, [esp + 0x118]
            //   50                   | push                eax

        $sequence_2 = { 6a00 8d431c 50 83c8ff }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   8d431c               | lea                 eax, [ebx + 0x1c]
            //   50                   | push                eax
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_3 = { e8???????? 59 33c9 8bd0 8955e4 3bd9 0f8431010000 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   33c9                 | xor                 ecx, ecx
            //   8bd0                 | mov                 edx, eax
            //   8955e4               | mov                 dword ptr [ebp - 0x1c], edx
            //   3bd9                 | cmp                 ebx, ecx
            //   0f8431010000         | je                  0x137

        $sequence_4 = { 33c0 668985f0efffff 8d8504f1ffff 50 8d85c0efffff 50 56 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   668985f0efffff       | mov                 word ptr [ebp - 0x1010], ax
            //   8d8504f1ffff         | lea                 eax, [ebp - 0xefc]
            //   50                   | push                eax
            //   8d85c0efffff         | lea                 eax, [ebp - 0x1040]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_5 = { 6a01 8d75d4 e8???????? 8b75ac 33c0 }
            // n = 5, score = 200
            //   6a01                 | push                1
            //   8d75d4               | lea                 esi, [ebp - 0x2c]
            //   e8????????           |                     
            //   8b75ac               | mov                 esi, dword ptr [ebp - 0x54]
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { 59 8b4d10 85c0 8901 0f95c0 5f }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   85c0                 | test                eax, eax
            //   8901                 | mov                 dword ptr [ecx], eax
            //   0f95c0               | setne               al
            //   5f                   | pop                 edi

        $sequence_7 = { 6880000000 6a02 53 6a01 6800000040 50 ffd7 }
            // n = 7, score = 200
            //   6880000000           | push                0x80
            //   6a02                 | push                2
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   6800000040           | push                0x40000000
            //   50                   | push                eax
            //   ffd7                 | call                edi

        $sequence_8 = { 8d45d0 8d8d44ffffff e8???????? 8bb538ffffff 56 e8???????? 59 }
            // n = 7, score = 200
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   8d8d44ffffff         | lea                 ecx, [ebp - 0xbc]
            //   e8????????           |                     
            //   8bb538ffffff         | mov                 esi, dword ptr [ebp - 0xc8]
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_9 = { 6a2d 66898d38ffffff 59 6a43 66898d3affffff 59 }
            // n = 6, score = 200
            //   6a2d                 | push                0x2d
            //   66898d38ffffff       | mov                 word ptr [ebp - 0xc8], cx
            //   59                   | pop                 ecx
            //   6a43                 | push                0x43
            //   66898d3affffff       | mov                 word ptr [ebp - 0xc6], cx
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 212992
}