rule win_arik_keylogger_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { b8???????? e8???????? 83f801 0f85cb000000 8d45b8 e8???????? c745b800000000 }
            // n = 7, score = 200
            //   b8????????           |                     
            //   e8????????           |                     
            //   83f801               | cmp                 eax, 1
            //   0f85cb000000         | jne                 0xd1
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   e8????????           |                     
            //   c745b800000000       | mov                 dword ptr [ebp - 0x48], 0

        $sequence_1 = { 8d45c4 b100 ba30000000 e8???????? 803d????????00 7410 c745c42c000000 }
            // n = 7, score = 200
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   b100                 | mov                 cl, 0
            //   ba30000000           | mov                 edx, 0x30
            //   e8????????           |                     
            //   803d????????00       |                     
            //   7410                 | je                  0x12
            //   c745c42c000000       | mov                 dword ptr [ebp - 0x3c], 0x2c

        $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 = { 8975b4 897db8 8945fc 8b4508 e8???????? c745bc00000000 8d4ddc }
            // n = 7, score = 200
            //   8975b4               | mov                 dword ptr [ebp - 0x4c], esi
            //   897db8               | mov                 dword ptr [ebp - 0x48], edi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   c745bc00000000       | mov                 dword ptr [ebp - 0x44], 0
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]

        $sequence_4 = { 8b835c010000 39f0 0f8486000000 85f6 7430 89f2 b8???????? }
            // n = 7, score = 200
            //   8b835c010000         | mov                 eax, dword ptr [ebx + 0x15c]
            //   39f0                 | cmp                 eax, esi
            //   0f8486000000         | je                  0x8c
            //   85f6                 | test                esi, esi
            //   7430                 | je                  0x32
            //   89f2                 | mov                 edx, esi
            //   b8????????           |                     

        $sequence_5 = { ff92e8000000 89d8 ba0a000000 e8???????? eb17 8b8354010000 83f80a }
            // n = 7, score = 200
            //   ff92e8000000         | call                dword ptr [edx + 0xe8]
            //   89d8                 | mov                 eax, ebx
            //   ba0a000000           | mov                 edx, 0xa
            //   e8????????           |                     
            //   eb17                 | jmp                 0x19
            //   8b8354010000         | mov                 eax, dword ptr [ebx + 0x154]
            //   83f80a               | cmp                 eax, 0xa

        $sequence_6 = { ff45b8 e9???????? 8b4510 8b00 8b5580 8b0490 40 }
            // n = 7, score = 200
            //   ff45b8               | inc                 dword ptr [ebp - 0x48]
            //   e9????????           |                     
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b5580               | mov                 edx, dword ptr [ebp - 0x80]
            //   8b0490               | mov                 eax, dword ptr [eax + edx*4]
            //   40                   | inc                 eax

        $sequence_7 = { ff75f8 6898010000 ff75ec e8???????? 83f8ff 7406 c645f001 }
            // n = 7, score = 200
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   6898010000           | push                0x198
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   7406                 | je                  8
            //   c645f001             | mov                 byte ptr [ebp - 0x10], 1

        $sequence_8 = { 7426 48 743e 48 7461 e9???????? 8b4df0 }
            // n = 7, score = 200
            //   7426                 | je                  0x28
            //   48                   | dec                 eax
            //   743e                 | je                  0x40
            //   48                   | dec                 eax
            //   7461                 | je                  0x63
            //   e9????????           |                     
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]

        $sequence_9 = { ff5178 8b55d4 a1???????? 8b0d???????? 8b09 ff91c8000000 89c7 }
            // n = 7, score = 200
            //   ff5178               | call                dword ptr [ecx + 0x78]
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   a1????????           |                     
            //   8b0d????????         |                     
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   ff91c8000000         | call                dword ptr [ecx + 0xc8]
            //   89c7                 | mov                 edi, eax

    condition:
        7 of them and filesize < 4947968
}