rule win_avzhan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.avzhan."
        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.avzhan"
        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 = { 6a00 6a00 8d8c2418020000 6a00 51 6a00 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8c2418020000       | lea                 ecx, [esp + 0x218]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   6a00                 | push                0

        $sequence_1 = { 81c300040000 e8???????? 83c061 8bcb }
            // n = 4, score = 200
            //   81c300040000         | add                 ebx, 0x400
            //   e8????????           |                     
            //   83c061               | add                 eax, 0x61
            //   8bcb                 | mov                 ecx, ebx

        $sequence_2 = { 6a00 6a00 6a00 6a00 6a00 8d8c2418020000 6a00 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8c2418020000       | lea                 ecx, [esp + 0x218]
            //   6a00                 | push                0

        $sequence_3 = { 68???????? eb1d 6a02 e8???????? 83c008 }
            // n = 5, score = 200
            //   68????????           |                     
            //   eb1d                 | jmp                 0x1f
            //   6a02                 | push                2
            //   e8????????           |                     
            //   83c008               | add                 eax, 8

        $sequence_4 = { 6a1a 81c300040000 e8???????? 83c061 }
            // n = 4, score = 200
            //   6a1a                 | push                0x1a
            //   81c300040000         | add                 ebx, 0x400
            //   e8????????           |                     
            //   83c061               | add                 eax, 0x61

        $sequence_5 = { f2ae f7d1 6a00 51 8d8c2404020000 51 56 }
            // n = 7, score = 200
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   8d8c2404020000       | lea                 ecx, [esp + 0x204]
            //   51                   | push                ecx
            //   56                   | push                esi

        $sequence_6 = { 50 ff15???????? e9???????? 68???????? 53 6801001f00 ff15???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   e9????????           |                     
            //   68????????           |                     
            //   53                   | push                ebx
            //   6801001f00           | push                0x1f0001
            //   ff15????????         |                     

        $sequence_7 = { c744243844000000 f3ab 8b442464 8b3d???????? }
            // n = 4, score = 200
            //   c744243844000000     | mov                 dword ptr [esp + 0x38], 0x44
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8b442464             | mov                 eax, dword ptr [esp + 0x64]
            //   8b3d????????         |                     

        $sequence_8 = { 7410 68d0070000 ffd7 6a00 8b542414 52 }
            // n = 6, score = 200
            //   7410                 | je                  0x12
            //   68d0070000           | push                0x7d0
            //   ffd7                 | call                edi
            //   6a00                 | push                0
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   52                   | push                edx

        $sequence_9 = { 3935???????? 7450 8b942464010000 8d442464 52 50 e8???????? }
            // n = 7, score = 200
            //   3935????????         |                     
            //   7450                 | je                  0x52
            //   8b942464010000       | mov                 edx, dword ptr [esp + 0x164]
            //   8d442464             | lea                 eax, [esp + 0x64]
            //   52                   | push                edx
            //   50                   | push                eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 122880
}