rule win_acehash_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { c1e810 0fb6d0 438b848270a90400 4133849270b50400 0fb6d1 410fb6c9 4133849270b10400 }
            // n = 7, score = 200
            //   c1e810               | mov                 edi, 0x80
            //   0fb6d0               | nop                 word ptr [eax + eax]
            //   438b848270a90400     | dec                 eax
            //   4133849270b50400     | lea                 edx, [esp + 0x20]
            //   0fb6d1               | dec                 eax
            //   410fb6c9             | lea                 ecx, [esp + 0x20]
            //   4133849270b10400     | dec                 ebp

        $sequence_1 = { 43381c2f 75f7 4c896c2448 bd6c660000 41bb6c680000 395814 0f8494030000 }
            // n = 7, score = 200
            //   43381c2f             | dec                 eax
            //   75f7                 | mov                 dword ptr [esp + 0x18], edi
            //   4c896c2448           | inc                 ecx
            //   bd6c660000           | push                edi
            //   41bb6c680000         | dec                 eax
            //   395814               | add                 esp, 0x28
            //   0f8494030000         | ret                 

        $sequence_2 = { 488d8481a0e90300 c1eb18 c1ee10 c1ef08 448955f7 488945d7 41c1ee10 }
            // n = 7, score = 200
            //   488d8481a0e90300     | dec                 ecx
            //   c1eb18               | dec                 ecx
            //   c1ee10               | inc                 eax
            //   c1ef08               | inc                 ecx
            //   448955f7             | mov                 byte ptr [eax - 1], al
            //   488945d7             | inc                 edx
            //   41c1ee10             | cmp                 byte ptr [ecx + esi], 0

        $sequence_3 = { c745a700000000 48c745ef02000000 440bd8 0fb6450a 41c1e308 440bd8 0fb6450c }
            // n = 7, score = 200
            //   c745a700000000       | shr                 eax, 0x10
            //   48c745ef02000000     | movzx               edx, al
            //   440bd8               | inc                 ecx
            //   0fb6450a             | mov                 eax, ebp
            //   41c1e308             | inc                 ebp
            //   440bd8               | mov                 eax, dword ptr [edi + edx*4 + 0x4b170]
            //   0fb6450c             | shr                 eax, 0x18

        $sequence_4 = { 83e13f 8b948e10f80300 33948610fa0300 418bc0 }
            // n = 4, score = 200
            //   83e13f               | lea                 ecx, [0xffff509a]
            //   8b948e10f80300       | dec                 eax
            //   33948610fa0300       | xor                 edx, dword ptr [ecx + eax*8 + 0x389b0]
            //   418bc0               | inc                 edx

        $sequence_5 = { 0fb64103 41c1e208 440bd0 0fb64105 440bd8 0fb64106 41c1e308 }
            // n = 7, score = 200
            //   0fb64103             | add                 ecx, ebx
            //   41c1e208             | inc                 edx
            //   440bd0               | lea                 eax, [ebx + ebx*2]
            //   0fb64105             | rol                 eax, 9
            //   440bd8               | inc                 ecx
            //   0fb64106             | mov                 dword ptr [ebp - 8], eax
            //   41c1e308             | cmp                 esi, 0x14

        $sequence_6 = { 488d0de8030300 4883c204 48c1fa02 482bd3 e8???????? 448b4608 488bd6 }
            // n = 7, score = 200
            //   488d0de8030300       | test                eax, eax
            //   4883c204             | jle                 0xcf
            //   48c1fa02             | nop                 word ptr [eax + eax]
            //   482bd3               | inc                 ecx
            //   e8????????           |                     
            //   448b4608             | mov                 eax, dword ptr [esi + edi*4]
            //   488bd6               | dec                 ecx

        $sequence_7 = { 8bf9 e8???????? 4885c0 7509 488d05b3890f00 eb04 4883c014 }
            // n = 7, score = 200
            //   8bf9                 | xor                 edx, eax
            //   e8????????           |                     
            //   4885c0               | mov                 edx, ebx
            //   7509                 | inc                 ecx
            //   488d05b3890f00       | xor                 edx, ebp
            //   eb04                 | xor                 ecx, ecx
            //   4883c014             | inc                 ecx

        $sequence_8 = { c1c205 448bc8 4533cc 8bca 33d6 41d3c1 8bc8 }
            // n = 7, score = 200
            //   c1c205               | ret                 
            //   448bc8               | dec                 eax
            //   4533cc               | mov                 dword ptr [esp + 0x30], ebx
            //   8bca                 | inc                 ecx
            //   33d6                 | mov                 eax, edx
            //   41d3c1               | mov                 eax, 4
            //   8bc8                 | dec                 eax

        $sequence_9 = { 498b4638 488d0db4060300 440fbf441802 488d3418 488beb 488bd6 }
            // n = 6, score = 200
            //   498b4638             | inc                 esp
            //   488d0db4060300       | movzx               ecx, al
            //   440fbf441802         | shr                 eax, 0x18
            //   488d3418             | inc                 esp
            //   488beb               | movzx               esi, al
            //   488bd6               | mov                 eax, ecx

    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*))
}