rule win_arik_keylogger_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.arik_keylogger."
        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.arik_keylogger"
        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 = { 8d907cffffff 8b45f8 8b40f8 8b4008 e8???????? 8b45f8 8b807cffffff }
            // n = 7, score = 200
            //   8d907cffffff         | lea                 edx, [eax - 0x84]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b40f8               | mov                 eax, dword ptr [eax - 8]
            //   8b4008               | mov                 eax, dword ptr [eax + 8]
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b807cffffff         | mov                 eax, dword ptr [eax - 0x84]

        $sequence_1 = { 8b55bc 29d0 89459c 48 89c7 c745c000000000 3b7dc0 }
            // n = 7, score = 200
            //   8b55bc               | mov                 edx, dword ptr [ebp - 0x44]
            //   29d0                 | sub                 eax, edx
            //   89459c               | mov                 dword ptr [ebp - 0x64], eax
            //   48                   | dec                 eax
            //   89c7                 | mov                 edi, eax
            //   c745c000000000       | mov                 dword ptr [ebp - 0x40], 0
            //   3b7dc0               | cmp                 edi, dword ptr [ebp - 0x40]

        $sequence_2 = { db7dc0 8d55c0 8955ec c745e803000000 dd4508 db7db0 8d55b0 }
            // n = 7, score = 200
            //   db7dc0               | fstp                xword ptr [ebp - 0x40]
            //   8d55c0               | lea                 edx, [ebp - 0x40]
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx
            //   c745e803000000       | mov                 dword ptr [ebp - 0x18], 3
            //   dd4508               | fld                 qword ptr [ebp + 8]
            //   db7db0               | fstp                xword ptr [ebp - 0x50]
            //   8d55b0               | lea                 edx, [ebp - 0x50]

        $sequence_3 = { b803000000 234210 83f802 751f 8b45fc 8b400c 85c0 }
            // n = 7, score = 200
            //   b803000000           | mov                 eax, 3
            //   234210               | and                 eax, dword ptr [edx + 0x10]
            //   83f802               | cmp                 eax, 2
            //   751f                 | jne                 0x21
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_4 = { 8d956cfeffff b801000000 e8???????? e8???????? 50 85c0 0f85e9030000 }
            // n = 7, score = 200
            //   8d956cfeffff         | lea                 edx, [ebp - 0x194]
            //   b801000000           | mov                 eax, 1
            //   e8????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax
            //   85c0                 | test                eax, eax
            //   0f85e9030000         | jne                 0x3ef

        $sequence_5 = { 8d7dc4 fc a5 8d45bc e8???????? c745bc00000000 8d55bc }
            // n = 7, score = 200
            //   8d7dc4               | lea                 edi, [ebp - 0x3c]
            //   fc                   | cld                 
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   e8????????           |                     
            //   c745bc00000000       | mov                 dword ptr [ebp - 0x44], 0
            //   8d55bc               | lea                 edx, [ebp - 0x44]

        $sequence_6 = { 8b45f8 8b88a8010000 8b45f8 8b900c010000 8b45f8 8b8070010000 8b5df8 }
            // n = 7, score = 200
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b88a8010000         | mov                 ecx, dword ptr [eax + 0x1a8]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b900c010000         | mov                 edx, dword ptr [eax + 0x10c]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b8070010000         | mov                 eax, dword ptr [eax + 0x170]
            //   8b5df8               | mov                 ebx, dword ptr [ebp - 8]

        $sequence_7 = { 8b80fc000000 e8???????? 84c0 744e 8b45f4 8b80fc000000 8b80c4020000 }
            // n = 7, score = 200
            //   8b80fc000000         | mov                 eax, dword ptr [eax + 0xfc]
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   744e                 | je                  0x50
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   8b80fc000000         | mov                 eax, dword ptr [eax + 0xfc]
            //   8b80c4020000         | mov                 eax, dword ptr [eax + 0x2c4]

        $sequence_8 = { eb41 ff864c010000 8b864c010000 48 8986f8000000 8b96dc000000 8b86e0000000 }
            // n = 7, score = 200
            //   eb41                 | jmp                 0x43
            //   ff864c010000         | inc                 dword ptr [esi + 0x14c]
            //   8b864c010000         | mov                 eax, dword ptr [esi + 0x14c]
            //   48                   | dec                 eax
            //   8986f8000000         | mov                 dword ptr [esi + 0xf8], eax
            //   8b96dc000000         | mov                 edx, dword ptr [esi + 0xdc]
            //   8b86e0000000         | mov                 eax, dword ptr [esi + 0xe0]

        $sequence_9 = { e8???????? c7458400000000 8b55e8 4a 8d4d84 8b45fc e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   c7458400000000       | mov                 dword ptr [ebp - 0x7c], 0
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   4a                   | dec                 edx
            //   8d4d84               | lea                 ecx, [ebp - 0x7c]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 4947968
}