rule win_smac_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 33c0 668945ae 8d45b0 50 ff35???????? c745b06c737472 c745b4636d7069 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   668945ae             | mov                 word ptr [ebp - 0x52], ax
            //   8d45b0               | lea                 eax, [ebp - 0x50]
            //   50                   | push                eax
            //   ff35????????         |                     
            //   c745b06c737472       | mov                 dword ptr [ebp - 0x50], 0x7274736c
            //   c745b4636d7069       | mov                 dword ptr [ebp - 0x4c], 0x69706d63

        $sequence_1 = { 8d45b4 50 8d8560ffffff 50 8d7d98 c645fc0b }
            // n = 6, score = 200
            //   8d45b4               | lea                 eax, [ebp - 0x4c]
            //   50                   | push                eax
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]
            //   50                   | push                eax
            //   8d7d98               | lea                 edi, [ebp - 0x68]
            //   c645fc0b             | mov                 byte ptr [ebp - 4], 0xb

        $sequence_2 = { 8d45bc 50 ff15???????? 33c0 56 6689850cf9ffff 8d850ef9ffff }
            // n = 7, score = 200
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   56                   | push                esi
            //   6689850cf9ffff       | mov                 word ptr [ebp - 0x6f4], ax
            //   8d850ef9ffff         | lea                 eax, [ebp - 0x6f2]

        $sequence_3 = { 0f82ab0f0000 ff15???????? a3???????? 33c0 c78528f1ffff07000000 899d24f1ffff }
            // n = 6, score = 200
            //   0f82ab0f0000         | jb                  0xfb1
            //   ff15????????         |                     
            //   a3????????           |                     
            //   33c0                 | xor                 eax, eax
            //   c78528f1ffff07000000     | mov    dword ptr [ebp - 0xed8], 7
            //   899d24f1ffff         | mov                 dword ptr [ebp - 0xedc], ebx

        $sequence_4 = { ff93c8000000 8b8394000000 85c0 7407 50 ff93c8000000 ffb3c4000000 }
            // n = 7, score = 200
            //   ff93c8000000         | call                dword ptr [ebx + 0xc8]
            //   8b8394000000         | mov                 eax, dword ptr [ebx + 0x94]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   50                   | push                eax
            //   ff93c8000000         | call                dword ptr [ebx + 0xc8]
            //   ffb3c4000000         | push                dword ptr [ebx + 0xc4]

        $sequence_5 = { ffd7 89856cf4ffff 83f8ff 0f84bd000000 }
            // n = 4, score = 200
            //   ffd7                 | call                edi
            //   89856cf4ffff         | mov                 dword ptr [ebp - 0xb94], eax
            //   83f8ff               | cmp                 eax, -1
            //   0f84bd000000         | je                  0xc3

        $sequence_6 = { 8d852cfcffff 6a5c 50 e8???????? 68???????? 8d8534feffff 50 }
            // n = 7, score = 200
            //   8d852cfcffff         | lea                 eax, [ebp - 0x3d4]
            //   6a5c                 | push                0x5c
            //   50                   | push                eax
            //   e8????????           |                     
            //   68????????           |                     
            //   8d8534feffff         | lea                 eax, [ebp - 0x1cc]
            //   50                   | push                eax

        $sequence_7 = { 50 ff15???????? 83f8ff 7504 33f6 eb20 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   7504                 | jne                 6
            //   33f6                 | xor                 esi, esi
            //   eb20                 | jmp                 0x22

        $sequence_8 = { 57 8bf8 83cbff 895dfc 3bcf 0f829a010000 8bc1 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax
            //   83cbff               | or                  ebx, 0xffffffff
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   3bcf                 | cmp                 ecx, edi
            //   0f829a010000         | jb                  0x1a0
            //   8bc1                 | mov                 eax, ecx

        $sequence_9 = { c645fc0d e8???????? 8d45d0 50 8d45b4 50 8d8560ffffff }
            // n = 7, score = 200
            //   c645fc0d             | mov                 byte ptr [ebp - 4], 0xd
            //   e8????????           |                     
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   50                   | push                eax
            //   8d45b4               | lea                 eax, [ebp - 0x4c]
            //   50                   | push                eax
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]

    condition:
        7 of them and filesize < 212992
}