rule win_avzhan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 6a00 6a00 8d8c2418020000 6a00 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8c2418020000       | lea                 ecx, [esp + 0x218]
            //   6a00                 | push                0

        $sequence_1 = { e8???????? 83c404 50 e8???????? 8bf0 8dbc2404020000 83c9ff }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8dbc2404020000       | lea                 edi, [esp + 0x204]
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_2 = { 8d542468 51 8d842484010000 52 50 8d8c240c020000 68???????? }
            // n = 7, score = 200
            //   8d542468             | lea                 edx, [esp + 0x68]
            //   51                   | push                ecx
            //   8d842484010000       | lea                 eax, [esp + 0x184]
            //   52                   | push                edx
            //   50                   | push                eax
            //   8d8c240c020000       | lea                 ecx, [esp + 0x20c]
            //   68????????           |                     

        $sequence_3 = { 8b3d???????? 833d????????01 7418 6a00 }
            // n = 4, score = 200
            //   8b3d????????         |                     
            //   833d????????01       |                     
            //   7418                 | je                  0x1a
            //   6a00                 | push                0

        $sequence_4 = { 83c408 8bc2 c1e010 668bc2 }
            // n = 4, score = 200
            //   83c408               | add                 esp, 8
            //   8bc2                 | mov                 eax, edx
            //   c1e010               | shl                 eax, 0x10
            //   668bc2               | mov                 ax, dx

        $sequence_5 = { 66c74424500000 3935???????? 743c 8d542410 8d442420 52 50 }
            // n = 7, score = 200
            //   66c74424500000       | mov                 word ptr [esp + 0x50], 0
            //   3935????????         |                     
            //   743c                 | je                  0x3e
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_6 = { ffd5 85c0 7410 68d0070000 ffd7 6a00 8b542414 }
            // n = 7, score = 200
            //   ffd5                 | call                ebp
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   68d0070000           | push                0x7d0
            //   ffd7                 | call                edi
            //   6a00                 | push                0
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]

        $sequence_7 = { 8bc3 83c408 c1e010 668bc3 8b1d???????? c1e902 }
            // n = 6, score = 200
            //   8bc3                 | mov                 eax, ebx
            //   83c408               | add                 esp, 8
            //   c1e010               | shl                 eax, 0x10
            //   668bc3               | mov                 ax, bx
            //   8b1d????????         |                     
            //   c1e902               | shr                 ecx, 2

        $sequence_8 = { 56 e8???????? 83c404 85c0 741e 8d442464 8d4c2464 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   741e                 | je                  0x20
            //   8d442464             | lea                 eax, [esp + 0x64]
            //   8d4c2464             | lea                 ecx, [esp + 0x64]

        $sequence_9 = { 85c0 741e 8d442464 8d4c2464 50 }
            // n = 5, score = 200
            //   85c0                 | test                eax, eax
            //   741e                 | je                  0x20
            //   8d442464             | lea                 eax, [esp + 0x64]
            //   8d4c2464             | lea                 ecx, [esp + 0x64]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 122880
}