rule win_keylogger_apt3_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.keylogger_apt3."
        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.keylogger_apt3"
        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 = { 8b0d???????? 8d842414010000 50 51 e8???????? }
            // n = 5, score = 300
            //   8b0d????????         |                     
            //   8d842414010000       | lea                 eax, [esp + 0x114]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_1 = { a3???????? eb0a c705????????00000000 8b15???????? 68???????? 52 }
            // n = 6, score = 300
            //   a3????????           |                     
            //   eb0a                 | jmp                 0xc
            //   c705????????00000000     |     
            //   8b15????????         |                     
            //   68????????           |                     
            //   52                   | push                edx

        $sequence_2 = { 52 a3???????? ff15???????? 8b0d???????? 8d44240c 50 }
            // n = 6, score = 300
            //   52                   | push                edx
            //   a3????????           |                     
            //   ff15????????         |                     
            //   8b0d????????         |                     
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   50                   | push                eax

        $sequence_3 = { 8d83d8010000 50 81c1c8000000 51 ffd6 8b15???????? 8b82e8000000 }
            // n = 7, score = 300
            //   8d83d8010000         | lea                 eax, [ebx + 0x1d8]
            //   50                   | push                eax
            //   81c1c8000000         | add                 ecx, 0xc8
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8b15????????         |                     
            //   8b82e8000000         | mov                 eax, dword ptr [edx + 0xe8]

        $sequence_4 = { 8810 897008 897010 89700c 0514010000 03cf }
            // n = 6, score = 300
            //   8810                 | mov                 byte ptr [eax], dl
            //   897008               | mov                 dword ptr [eax + 8], esi
            //   897010               | mov                 dword ptr [eax + 0x10], esi
            //   89700c               | mov                 dword ptr [eax + 0xc], esi
            //   0514010000           | add                 eax, 0x114
            //   03cf                 | add                 ecx, edi

        $sequence_5 = { c705????????00000000 8b15???????? 68???????? 52 ff15???????? }
            // n = 5, score = 300
            //   c705????????00000000     |     
            //   8b15????????         |                     
            //   68????????           |                     
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_6 = { 7e25 be???????? 90 837e04ff 750e 8b0e 394c2414 }
            // n = 7, score = 300
            //   7e25                 | jle                 0x27
            //   be????????           |                     
            //   90                   | nop                 
            //   837e04ff             | cmp                 dword ptr [esi + 4], -1
            //   750e                 | jne                 0x10
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   394c2414             | cmp                 dword ptr [esp + 0x14], ecx

        $sequence_7 = { 75f9 2bc2 8be8 3bfd }
            // n = 4, score = 300
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   8be8                 | mov                 ebp, eax
            //   3bfd                 | cmp                 edi, ebp

        $sequence_8 = { 68???????? 52 ffd7 8b0d???????? 8d442438 50 }
            // n = 6, score = 300
            //   68????????           |                     
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   8b0d????????         |                     
            //   8d442438             | lea                 eax, [esp + 0x38]
            //   50                   | push                eax

        $sequence_9 = { 6888020000 bf01000000 e8???????? a1???????? 83c404 }
            // n = 5, score = 300
            //   6888020000           | push                0x288
            //   bf01000000           | mov                 edi, 1
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c404               | add                 esp, 4

    condition:
        7 of them and filesize < 761856
}