rule win_c0d0so0_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.c0d0so0."
        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.c0d0so0"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 50 ff15???????? 8945fc 8d4df8 83c012 51 }
            // n = 6, score = 600
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   83c012               | add                 eax, 0x12
            //   51                   | push                ecx

        $sequence_1 = { ffb56cfdffff 8b35???????? 6a00 ffd6 50 }
            // n = 5, score = 600
            //   ffb56cfdffff         | push                dword ptr [ebp - 0x294]
            //   8b35????????         |                     
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   50                   | push                eax

        $sequence_2 = { 8a4902 ebf2 8a4901 ebed 8a4902 }
            // n = 5, score = 600
            //   8a4902               | mov                 cl, byte ptr [ecx + 2]
            //   ebf2                 | jmp                 0xfffffff4
            //   8a4901               | mov                 cl, byte ptr [ecx + 1]
            //   ebed                 | jmp                 0xffffffef
            //   8a4902               | mov                 cl, byte ptr [ecx + 2]

        $sequence_3 = { 50 ff15???????? 85c0 0f8435ffffff eb04 }
            // n = 5, score = 600
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8435ffffff         | je                  0xffffff3b
            //   eb04                 | jmp                 6

        $sequence_4 = { 0f8399000000 53 56 57 8d5924 8b13 8bca }
            // n = 7, score = 600
            //   0f8399000000         | jae                 0x9f
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d5924               | lea                 ebx, [ecx + 0x24]
            //   8b13                 | mov                 edx, dword ptr [ebx]
            //   8bca                 | mov                 ecx, edx

        $sequence_5 = { 7503 50 eb44 8d856cfdffff 50 53 ff9568fdffff }
            // n = 7, score = 600
            //   7503                 | jne                 5
            //   50                   | push                eax
            //   eb44                 | jmp                 0x46
            //   8d856cfdffff         | lea                 eax, [ebp - 0x294]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff9568fdffff         | call                dword ptr [ebp - 0x298]

        $sequence_6 = { 7511 8d45f0 50 ff75f0 56 ff75f8 }
            // n = 6, score = 600
            //   7511                 | jne                 0x13
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   56                   | push                esi
            //   ff75f8               | push                dword ptr [ebp - 8]

        $sequence_7 = { c3 2b05???????? 56 57 33ff ba???????? 8b32 }
            // n = 7, score = 600
            //   c3                   | ret                 
            //   2b05????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ba????????           |                     
            //   8b32                 | mov                 esi, dword ptr [edx]

        $sequence_8 = { ff9568fdffff 85c0 7531 8bc3 8b8894010000 }
            // n = 5, score = 600
            //   ff9568fdffff         | call                dword ptr [ebp - 0x298]
            //   85c0                 | test                eax, eax
            //   7531                 | jne                 0x33
            //   8bc3                 | mov                 eax, ebx
            //   8b8894010000         | mov                 ecx, dword ptr [eax + 0x194]

        $sequence_9 = { 56 e8???????? eb1d 8a4902 ebf2 8a4901 }
            // n = 6, score = 600
            //   56                   | push                esi
            //   e8????????           |                     
            //   eb1d                 | jmp                 0x1f
            //   8a4902               | mov                 cl, byte ptr [ecx + 2]
            //   ebf2                 | jmp                 0xfffffff4
            //   8a4901               | mov                 cl, byte ptr [ecx + 1]

    condition:
        7 of them and filesize < 450560
}