rule win_acehash_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 33c3 488d1dbdad0300 89471c 488d3dd7ad0300 418b4b18 4983c310 e8???????? }
            // n = 7, score = 200
            //   33c3                 | inc                 ecx
            //   488d1dbdad0300       | mov                 ecx, ecx
            //   89471c               | shr                 ecx, 4
            //   488d3dd7ad0300       | inc                 ebp
            //   418b4b18             | mov                 eax, dword ptr [ebx + 8]
            //   4983c310             | shl                 ecx, 0xc
            //   e8????????           |                     

        $sequence_1 = { 488bc1 48c1f805 488d1554fe0d00 83e11f 486bc958 488b04c2 80640808fe }
            // n = 7, score = 200
            //   488bc1               | dec                 ebp
            //   48c1f805             | lea                 edx, [eax + 1]
            //   488d1554fe0d00       | dec                 ebp
            //   83e11f               | lea                 ecx, [eax + 2]
            //   486bc958             | dec                 ecx
            //   488b04c2             | mov                 eax, 0xfffffffe
            //   80640808fe           | dec                 ecx

        $sequence_2 = { c3 4885d2 74f1 4885c9 }
            // n = 4, score = 200
            //   c3                   | dec                 esp
            //   4885d2               | arpl                bx, di
            //   74f1                 | inc                 esp
            //   4885c9               | mov                 dword ptr [esp + 0x28], esp

        $sequence_3 = { 0bc2 c1e008 0bc8 33d2 41894bfc 453bc2 72b7 }
            // n = 7, score = 200
            //   0bc2                 | movzx               edx, byte ptr [ecx + 4]
            //   c1e008               | inc                 ecx
            //   0bc8                 | shl                 ecx, 8
            //   33d2                 | inc                 ecx
            //   41894bfc             | shl                 edx, 8
            //   453bc2               | dec                 eax
            //   72b7                 | mov                 dword ptr [esp + 0x10], esi

        $sequence_4 = { 418bc2 c1e808 0fb6c8 410fb6c2 4133948900040000 41331481 8b4518 }
            // n = 7, score = 200
            //   418bc2               | dec                 eax
            //   c1e808               | inc                 ebx
            //   0fb6c8               | inc                 ecx
            //   410fb6c2             | cmp                 byte ptr [eax + ebx], 0
            //   4133948900040000     | jne                 0x172c
            //   41331481             | mov                 eax, ebx
            //   8b4518               | dec                 eax

        $sequence_5 = { 4c8b4c2440 8b7c2420 3b7c242c 7d25 4c8b442458 4c8b542470 448b5c2424 }
            // n = 7, score = 200
            //   4c8b4c2440           | jne                 0x106b
            //   8b7c2420             | dec                 ecx
            //   3b7c242c             | dec                 eax
            //   7d25                 | dec                 eax
            //   4c8b442458           | cmp                 ecx, dword ptr [ebx + 0x10]
            //   4c8b542470           | jge                 0x105d
            //   448b5c2424           | dec                 eax

        $sequence_6 = { 397ddc 746c 4c8d153b94fdff 4b8b84eaa0511100 f644300848 741e ba0a000000 }
            // n = 7, score = 200
            //   397ddc               | movsx               edi, word ptr [eax + 2]
            //   746c                 | dec                 eax
            //   4c8d153b94fdff       | mov                 dword ptr [esp + 0x28], eax
            //   4b8b84eaa0511100     | mov                 dword ptr [esp + 0x20], edi
            //   f644300848           | dec                 eax
            //   741e                 | add                 eax, 0xb0
            //   ba0a000000           | inc                 edx

        $sequence_7 = { 488905???????? ff15???????? 488d15493b0300 483305???????? 488bcb }
            // n = 5, score = 200
            //   488905????????       |                     
            //   ff15????????         |                     
            //   488d15493b0300       | inc                 edx
            //   483305????????       |                     
            //   488bcb               | xor                 edx, dword ptr [esi + eax*4 + 0x3ff10]

        $sequence_8 = { 488d0de90a0300 e8???????? 83f8ff 750a b80c00e00c 4883c428 c3 }
            // n = 7, score = 200
            //   488d0de90a0300       | mov                 dword ptr [esp + 0x70], ebp
            //   e8????????           |                     
            //   83f8ff               | mov                 dword ptr [esp + 0x34], ebp
            //   750a                 | mov                 edi, ebp
            //   b80c00e00c           | mov                 dword ptr [esp + 0x20], ebp
            //   4883c428             | cmp                 cx, si
            //   c3                   | dec                 esp

        $sequence_9 = { 8bd3 498bce 4889442420 e8???????? 4c8d3df4110300 4c8d6738 4c8d0569130300 }
            // n = 7, score = 200
            //   8bd3                 | inc                 esp
            //   498bce               | movzx               ebp, al
            //   4889442420           | mov                 eax, ecx
            //   e8????????           |                     
            //   4c8d3df4110300       | shr                 eax, 0x10
            //   4c8d6738             | movzx               edx, al
            //   4c8d0569130300       | shr                 eax, 0x18

    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*))
}