rule win_mulcom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.mulcom."
        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.mulcom"
        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 = { 83b97004000002 0f8493010000 83cfff 488d2d8b2f0200 897350 89732c e9???????? }
            // n = 7, score = 100
            //   83b97004000002       | dec                 eax
            //   0f8493010000         | mov                 eax, dword ptr [esi]
            //   83cfff               | dec                 eax
            //   488d2d8b2f0200       | mov                 eax, dword ptr [ecx]
            //   897350               | call                dword ptr [eax + 0x18]
            //   89732c               | cmp                 eax, -1
            //   e9????????           |                     

        $sequence_1 = { 488b8188000000 488d8810020000 83b81807000005 480f45cf 48894dc0 8b1a 4c8b4a08 }
            // n = 7, score = 100
            //   488b8188000000       | movups              xmmword ptr [esp + 0x48], xmm0
            //   488d8810020000       | mov                 eax, dword ptr [esi + 0x10]
            //   83b81807000005       | mov                 dword ptr [esp + 0x58], eax
            //   480f45cf             | psrldq              xmm0, 8
            //   48894dc0             | dec                 ax
            //   8b1a                 | movd                eax, mm0
            //   4c8b4a08             | dec                 eax

        $sequence_2 = { 488955b7 48894daf 8a456f 88442430 488b7577 4c8b757f }
            // n = 6, score = 100
            //   488955b7             | mov                 dword ptr [ecx + 0x10], eax
            //   48894daf             | add                 dword ptr [ebx], 0x14
            //   8a456f               | mov                 ecx, dword ptr [ebx]
            //   88442430             | inc                 edx
            //   488b7577             | lea                 eax, [ecx + edi]
            //   4c8b757f             | movups              xmmword ptr [edx], xmm0

        $sequence_3 = { e9???????? 488d8a90000000 e9???????? 488d8a70010000 e9???????? 488b8a70000000 e9???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488d8a90000000       | lea                 edx, [0x154be]
            //   e9????????           |                     
            //   488d8a70010000       | mov                 ecx, 0x11
            //   e9????????           |                     
            //   488b8a70000000       | dec                 esp
            //   e9????????           |                     

        $sequence_4 = { 89542430 488d1575e40300 4489542428 44895c2420 e8???????? 488bc3 488b4df0 }
            // n = 7, score = 100
            //   89542430             | inc                 al
            //   488d1575e40300       | mov                 byte ptr [ecx], al
            //   4489542428           | dec                 dword ptr [ebx + 0x18]
            //   44895c2420           | jne                 0x368
            //   e8????????           |                     
            //   488bc3               | dec                 eax
            //   488b4df0             | mov                 ecx, dword ptr [ecx + 0x10]

        $sequence_5 = { 443be5 7c07 453bdd 450f4cc1 488b5c2440 }
            // n = 5, score = 100
            //   443be5               | dec                 eax
            //   7c07                 | mov                 esi, dword ptr [ebp - 0x40]
            //   453bdd               | dec                 eax
            //   450f4cc1             | mov                 edi, dword ptr [ebp - 0x58]
            //   488b5c2440           | movzx               ebx, byte ptr [esp + 0x30]

        $sequence_6 = { ff5030 488d55bf 488d4ddf e8???????? 488b55d7 4883fa10 }
            // n = 6, score = 100
            //   ff5030               | dec                 eax
            //   488d55bf             | test                ebx, ebx
            //   488d4ddf             | je                  0x1e3e
            //   e8????????           |                     
            //   488b55d7             | dec                 eax
            //   4883fa10             | cmp                 ebx, edi

        $sequence_7 = { 4288bc0592010000 49ffc0 4983c104 4584d2 75ba 4584d2 }
            // n = 6, score = 100
            //   4288bc0592010000     | movdqu              xmmword ptr [ebp - 0x68], xmm0
            //   49ffc0               | dec                 eax
            //   4983c104             | mov                 dword ptr [ebp + 0x70], ebx
            //   4584d2               | xorps               xmm1, xmm1
            //   75ba                 | mov                 byte ptr [ebp - 0x41], bl
            //   4584d2               | mov                 eax, dword ptr [ebp + 0x63]

        $sequence_8 = { 448938 488d0586e50400 488907 4c897f68 896f70 498bc6 488b5c2478 }
            // n = 7, score = 100
            //   448938               | jne                 0x146b
            //   488d0586e50400       | je                  0x147c
            //   488907               | dec                 eax
            //   4c897f68             | lea                 edx, [ebp + 0x50]
            //   896f70               | dec                 eax
            //   498bc6               | mov                 ecx, esi
            //   488b5c2478           | test                al, al

        $sequence_9 = { 7227 488d4e27 483bce 490f46cc e8???????? 4885c0 0f8415010000 }
            // n = 7, score = 100
            //   7227                 | test                ecx, ecx
            //   488d4e27             | je                  0x1b15
            //   483bce               | dec                 esp
            //   490f46cc             | lea                 eax, [0x2ce3f]
            //   e8????????           |                     
            //   4885c0               | dec                 eax
            //   0f8415010000         | test                eax, eax

    condition:
        7 of them and filesize < 867328
}