rule win_ismagent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 89742450 e8???????? 83c410 85c0 }
            // n = 4, score = 200
            //   89742450             | mov                 dword ptr [esp + 0x50], esi
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax

        $sequence_1 = { 7719 ff2485246f4000 6a04 58 }
            // n = 4, score = 200
            //   7719                 | ja                  0x1b
            //   ff2485246f4000       | jmp                 dword ptr [eax*4 + 0x406f24]
            //   6a04                 | push                4
            //   58                   | pop                 eax

        $sequence_2 = { 8b049d48404200 8b4de0 f644082801 7515 e8???????? c70009000000 }
            // n = 6, score = 200
            //   8b049d48404200       | mov                 eax, dword ptr [ebx*4 + 0x424048]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1
            //   7515                 | jne                 0x17
            //   e8????????           |                     
            //   c70009000000         | mov                 dword ptr [eax], 9

        $sequence_3 = { 8bc7 83e03f 6bc830 8b049548404200 8b440818 83f8ff }
            // n = 6, score = 200
            //   8bc7                 | mov                 eax, edi
            //   83e03f               | and                 eax, 0x3f
            //   6bc830               | imul                ecx, eax, 0x30
            //   8b049548404200       | mov                 eax, dword ptr [edx*4 + 0x424048]
            //   8b440818             | mov                 eax, dword ptr [eax + ecx + 0x18]
            //   83f8ff               | cmp                 eax, -1

        $sequence_4 = { 68???????? ff74242c e8???????? 68???????? 68???????? }
            // n = 5, score = 200
            //   68????????           |                     
            //   ff74242c             | push                dword ptr [esp + 0x2c]
            //   e8????????           |                     
            //   68????????           |                     
            //   68????????           |                     

        $sequence_5 = { 0f84ad030000 83f826 7603 6a26 58 0fb60c85b6c44100 }
            // n = 6, score = 200
            //   0f84ad030000         | je                  0x3b3
            //   83f826               | cmp                 eax, 0x26
            //   7603                 | jbe                 5
            //   6a26                 | push                0x26
            //   58                   | pop                 eax
            //   0fb60c85b6c44100     | movzx               ecx, byte ptr [eax*4 + 0x41c4b6]

        $sequence_6 = { 8974241c 7511 807a0220 750b }
            // n = 4, score = 200
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   7511                 | jne                 0x13
            //   807a0220             | cmp                 byte ptr [edx + 2], 0x20
            //   750b                 | jne                 0xd

        $sequence_7 = { 884108 8d8424f0000000 50 8d842404070000 50 ff15???????? }
            // n = 6, score = 200
            //   884108               | mov                 byte ptr [ecx + 8], al
            //   8d8424f0000000       | lea                 eax, [esp + 0xf0]
            //   50                   | push                eax
            //   8d842404070000       | lea                 eax, [esp + 0x704]
            //   50                   | push                eax
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 327680
}