rule win_acehash_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 7520 394b10 7e3b 488d4314 0f1f8000000000 fe00 752c }
            // n = 7, score = 200
            //   7520                 | inc                 ecx
            //   394b10               | cmp                 byte ptr [edi + eax], bl
            //   7e3b                 | jne                 0x1497
            //   488d4314             | inc                 ebp
            //   0f1f8000000000       | test                ah, ah
            //   fe00                 | je                  0x1497
            //   752c                 | inc                 ecx

        $sequence_1 = { 418bfa 41890c80 0fb645f7 c1ef08 4d8dac83a0e90300 400fb6c7 418b8c83a0e50300 }
            // n = 7, score = 200
            //   418bfa               | mov                 ebx, dword ptr [esp + 0x30]
            //   41890c80             | dec                 eax
            //   0fb645f7             | mov                 esi, dword ptr [esp + 0x38]
            //   c1ef08               | dec                 eax
            //   4d8dac83a0e90300     | add                 esp, 0x20
            //   400fb6c7             | dec                 eax
            //   418b8c83a0e50300     | sub                 edx, ebx

        $sequence_2 = { 48634804 8d9120ffffff 895419fc 4889bbc8000000 4889bbd0000000 4889bbb0000000 4889bbb8000000 }
            // n = 7, score = 200
            //   48634804             | mov                 eax, ebx
            //   8d9120ffffff         | dec                 esp
            //   895419fc             | mov                 ebp, dword ptr [esp + 0x130]
            //   4889bbc8000000       | dec                 eax
            //   4889bbd0000000       | mov                 ecx, dword ptr [ebp - 0x69]
            //   4889bbb0000000       | inc                 esp
            //   4889bbb8000000       | lea                 esp, [eax + 3]

        $sequence_3 = { 740f 4585c0 740a b804000000 e9???????? 4183fa10 7416 }
            // n = 7, score = 200
            //   740f                 | jbe                 0x20d
            //   4585c0               | je                  0x6d
            //   740a                 | dec                 eax
            //   b804000000           | test                ebx, ebx
            //   e9????????           |                     
            //   4183fa10             | je                  0x4b
            //   7416                 | lock dec            dword ptr [ebx]

        $sequence_4 = { 4883ec20 488bda 498bf8 488bd1 4885c9 7510 b810000000 }
            // n = 7, score = 200
            //   4883ec20             | dec                 eax
            //   488bda               | lea                 edx, [0x33b8f]
            //   498bf8               | dec                 eax
            //   488bd1               | mov                 ecx, ebx
            //   4885c9               | dec                 eax
            //   7510                 | mov                 ecx, eax
            //   b810000000           | mov                 dword ptr [esp + 0x78], eax

        $sequence_5 = { e8???????? 90 488b4310 48634804 488d05f9490300 4889441910 488b4310 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   90                   | cmp                 eax, ebp
            //   488b4310             | je                  0x29a
            //   48634804             | inc                 edi
            //   488d05f9490300       | dec                 eax
            //   4889441910           | add                 ebx, 4
            //   488b4310             | dec                 eax

        $sequence_6 = { 8bd8 85c0 0f853c030000 4c8b4e10 488b542438 498b4c2410 4d8bc7 }
            // n = 7, score = 200
            //   8bd8                 | mov                 eax, esi
            //   85c0                 | inc                 ecx
            //   0f853c030000         | sub                 esi, edx
            //   4c8b4e10             | test                eax, eax
            //   488b542438           | je                  0xc35
            //   498b4c2410           | inc                 ecx
            //   4d8bc7               | add                 ecx, edx

        $sequence_7 = { 488bd9 49c743e00f000000 4533c0 4d8943d8 }
            // n = 4, score = 200
            //   488bd9               | inc                 ecx
            //   49c743e00f000000     | mov                 eax, edx
            //   4533c0               | shr                 eax, 0x18
            //   4d8943d8             | inc                 ebp

        $sequence_8 = { 458b8489000c0000 0fb6c0 4533848100080000 8bc7 c1e818 0fb6c8 }
            // n = 6, score = 200
            //   458b8489000c0000     | dec                 esp
            //   0fb6c0               | mov                 ecx, ecx
            //   4533848100080000     | mov                 ebx, eax
            //   8bc7                 | test                eax, eax
            //   c1e818               | jne                 0xa78
            //   0fb6c8               | dec                 esp

        $sequence_9 = { 66660f1f840000000000 410fb64301 4983c308 48ffc9 4288441fea 410fb643f8 4288441feb }
            // n = 7, score = 200
            //   66660f1f840000000000     | inc    edx
            //   410fb64301           | jmp                 0x6f0
            //   4983c308             | mov                 edx, edi
            //   48ffc9               | mov                 dword ptr [esp + 0x20], edx
            //   4288441fea           | cmp                 edx, 0x101
            //   410fb643f8           | inc                 cx
            //   4288441feb           | inc                 dword ptr [esp + 2]

    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*))
}