rule win_ismagent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ismagent."
        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.ismagent"
        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 = { 8816 eb3e c6060d 8b048d48404200 8854382a eb2e }
            // n = 6, score = 200
            //   8816                 | mov                 byte ptr [esi], dl
            //   eb3e                 | jmp                 0x40
            //   c6060d               | mov                 byte ptr [esi], 0xd
            //   8b048d48404200       | mov                 eax, dword ptr [ecx*4 + 0x424048]
            //   8854382a             | mov                 byte ptr [eax + edi + 0x2a], dl
            //   eb2e                 | jmp                 0x30

        $sequence_1 = { 8b048d48404200 5b 8b543818 8955ec }
            // n = 4, score = 200
            //   8b048d48404200       | mov                 eax, dword ptr [ecx*4 + 0x424048]
            //   5b                   | pop                 ebx
            //   8b543818             | mov                 edx, dword ptr [eax + edi + 0x18]
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx

        $sequence_2 = { 8bd7 2bd1 8a01 8d4901 884411ff 84c0 }
            // n = 6, score = 200
            //   8bd7                 | mov                 edx, edi
            //   2bd1                 | sub                 edx, ecx
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   8d4901               | lea                 ecx, [ecx + 1]
            //   884411ff             | mov                 byte ptr [ecx + edx - 1], al
            //   84c0                 | test                al, al

        $sequence_3 = { 6a44 83e103 6a00 f3a4 50 e8???????? 8b7c244c }
            // n = 7, score = 200
            //   6a44                 | push                0x44
            //   83e103               | and                 ecx, 3
            //   6a00                 | push                0
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b7c244c             | mov                 edi, dword ptr [esp + 0x4c]

        $sequence_4 = { c1f806 6bc930 8b048548404200 f644082801 7406 8b440818 }
            // n = 6, score = 200
            //   c1f806               | sar                 eax, 6
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8b048548404200       | mov                 eax, dword ptr [eax*4 + 0x424048]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1
            //   7406                 | je                  8
            //   8b440818             | mov                 eax, dword ptr [eax + ecx + 0x18]

        $sequence_5 = { 53 8b5d10 8b048548404200 56 8b7508 57 8b4c0818 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   8b5d10               | mov                 ebx, dword ptr [ebp + 0x10]
            //   8b048548404200       | mov                 eax, dword ptr [eax*4 + 0x424048]
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8b4c0818             | mov                 ecx, dword ptr [eax + ecx + 0x18]

        $sequence_6 = { 8a01 41 84c0 75f9 2bca 0f8417010000 8d8424500b0000 }
            // n = 7, score = 200
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   41                   | inc                 ecx
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   2bca                 | sub                 ecx, edx
            //   0f8417010000         | je                  0x11d
            //   8d8424500b0000       | lea                 eax, [esp + 0xb50]

        $sequence_7 = { 47 42 8d7001 90 8a08 40 }
            // n = 6, score = 200
            //   47                   | inc                 edi
            //   42                   | inc                 edx
            //   8d7001               | lea                 esi, [eax + 1]
            //   90                   | nop                 
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   40                   | inc                 eax

    condition:
        7 of them and filesize < 327680
}