rule win_acehash_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.acehash."
        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.acehash"
        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 = { 48894348 884350 48894358 884360 4885ff 7539 488d05b8460300 }
            // n = 7, score = 200
            //   48894348             | mov                 ecx, ecx
            //   884350               | dec                 eax
            //   48894358             | test                edx, edx
            //   884360               | jne                 0xa02
            //   4885ff               | mov                 eax, 0x10
            //   7539                 | dec                 ecx
            //   488d05b8460300       | mov                 edi, eax

        $sequence_1 = { 440bd8 0fb64109 4c8d3da7110300 0bd8 0fb6410a 4c8d0dfa3cffff c1e308 }
            // n = 7, score = 200
            //   440bd8               | ret                 
            //   0fb64109             | dec                 eax
            //   4c8d3da7110300       | test                ebx, ebx
            //   0bd8                 | je                  0x1609
            //   0fb6410a             | dec                 eax
            //   4c8d0dfa3cffff       | mov                 ebx, dword ptr [esp + 0x50]
            //   c1e308               | dec                 eax

        $sequence_2 = { 48d1e8 c0e103 4c33c2 480bc8 410fb6c3 4c03c3 }
            // n = 6, score = 200
            //   48d1e8               | xor                 eax, eax
            //   c0e103               | dec                 eax
            //   4c33c2               | lea                 ecx, [0x32280]
            //   480bc8               | dec                 eax
            //   410fb6c3             | mov                 edx, dword ptr [esp + 0x48]
            //   4c03c3               | xor                 eax, eax

        $sequence_3 = { 33d2 4c8d05d8080300 498bc1 3b08 7411 4883c008 ffc2 }
            // n = 7, score = 200
            //   33d2                 | dec                 eax
            //   4c8d05d8080300       | xor                 ecx, eax
            //   498bc1               | inc                 ebp
            //   3b08                 | mov                 ebx, dword ptr [esi + edx*4 + 0x3c8a0]
            //   7411                 | movzx               eax, byte ptr [ebx + 0xa]
            //   4883c008             | dec                 eax
            //   ffc2                 | xor                 ecx, eax

        $sequence_4 = { 85c0 0f85b5000000 4c8d4587 488d55bf 488d4d87 }
            // n = 5, score = 200
            //   85c0                 | inc                 esp
            //   0f85b5000000         | sub                 eax, dword ptr [esi + ecx*4 + 0x3dda0]
            //   4c8d4587             | mov                 ecx, dword ptr [ebx + 0x54]
            //   488d55bf             | inc                 esp
            //   488d4d87             | add                 eax, dword ptr [esi + eax*4 + 0x3e1a0]

        $sequence_5 = { 488b742420 488b6c2418 418919 488b5c2410 }
            // n = 4, score = 200
            //   488b742420           | dec                 dword ptr [ebp - 0x11]
            //   488b6c2418           | inc                 esp
            //   418919               | mov                 ebx, dword ptr [ebp - 0x19]
            //   488b5c2410           | inc                 esp

        $sequence_6 = { 418bfd 6690 e8???????? 488903 4885c0 0f8404040000 }
            // n = 6, score = 200
            //   418bfd               | lea                 eax, [ebx*4 + 4]
            //   6690                 | dec                 ecx
            //   e8????????           |                     
            //   488903               | mov                 ecx, ecx
            //   4885c0               | dec                 eax
            //   0f8404040000         | mov                 edx, dword ptr [ebx]

        $sequence_7 = { 483305???????? 488bcb 488905???????? ff15???????? 483305???????? 488d152e3b0300 }
            // n = 6, score = 200
            //   483305????????       |                     
            //   488bcb               | inc                 esp
            //   488905????????       |                     
            //   ff15????????         |                     
            //   483305????????       |                     
            //   488d152e3b0300       | mov                 ecx, edx

        $sequence_8 = { 488d0d4a520e00 eb02 33c9 e8???????? 4883c438 c3 4883ec38 }
            // n = 7, score = 200
            //   488d0d4a520e00       | dec                 esp
            //   eb02                 | mov                 ecx, edx
            //   33c9                 | dec                 eax
            //   e8????????           |                     
            //   4883c438             | mov                 ebx, ecx
            //   c3                   | inc                 ebp
            //   4883ec38             | xor                 edx, edx

        $sequence_9 = { 4889bc2420020000 4585d2 745c 4c8d9c24f0000000 6666660f1f840000000000 410fb601 c1e208 }
            // n = 7, score = 200
            //   4889bc2420020000     | dec                 ecx
            //   4585d2               | mov                 edx, edi
            //   745c                 | dec                 esp
            //   4c8d9c24f0000000     | arpl                dx, si
            //   6666660f1f840000000000     | inc    ebp
            //   410fb601             | mov                 ebp, ecx
            //   c1e208               | inc                 ebp

    condition:
        7 of them and filesize < 2318336
}

rule win_acehash_w0 {
    meta:
        author = "Bundesamt fuer Verfassungsschutz"
        source = "https://www.verfassungsschutz.de/download/anlage-2019-12-bfv-cyber-brief-2019-01.txt"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.acehash"
        malpedia_version = "20191207"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
    strings:
        $b1 = { 0F B7 ?? 16 [0-1] (81 E? | 25) 00 20 [0-2] [8] 8B ?? 50 41 B9 40 00 00 00 41 B8 00 10 00 00 }
        $b2 = { 8B 40 28 [5-8] 48 03 C8 48 8B C1 [5-8] 48 89 41 28 }
        $b3 = { 48 6B ?? 28 [5-8] 8B ?? ?? 10 [5-8] 48 6B ?? 28 [5-8] 8B ?? ?? 14 }
        $b4 = { 83 B? 90 00 00 00 00 0F 84 [9-12] 83 B? 94 00 00 00 00 0F 84 }
        $b5 = { (45 | 4D) (31 | 33) C0 BA 01 00 00 00 [10-16] FF 5? 28 [0-1] (84 | 85) C0 }
    condition:
        (4 of ($b*))
}