rule win_bitter_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bitter_rat."
        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.bitter_rat"
        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 = { a3???????? a1???????? 50 8b4dd4 81c1???????? 51 68???????? }
            // n = 7, score = 200
            //   a3????????           |                     
            //   a1????????           |                     
            //   50                   | push                eax
            //   8b4dd4               | mov                 ecx, dword ptr [ebp - 0x2c]
            //   81c1????????         |                     
            //   51                   | push                ecx
            //   68????????           |                     

        $sequence_1 = { 8d8ddcfeffff 51 6a00 6a00 68???????? 8b55e8 52 }
            // n = 7, score = 200
            //   8d8ddcfeffff         | lea                 ecx, [ebp - 0x124]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   52                   | push                edx

        $sequence_2 = { 6a05 6a02 6a01 8d45dc 50 8b4df4 51 }
            // n = 7, score = 200
            //   6a05                 | push                5
            //   6a02                 | push                2
            //   6a01                 | push                1
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   51                   | push                ecx

        $sequence_3 = { ff34c52c3a4500 53 57 e8???????? 83c40c 85c0 740d }
            // n = 7, score = 200
            //   ff34c52c3a4500       | push                dword ptr [eax*8 + 0x453a2c]
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf

        $sequence_4 = { 8b8dacfeffff 51 e8???????? 83c408 8bf4 8d85a0feffff 50 }
            // n = 7, score = 200
            //   8b8dacfeffff         | mov                 ecx, dword ptr [ebp - 0x154]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bf4                 | mov                 esi, esp
            //   8d85a0feffff         | lea                 eax, [ebp - 0x160]
            //   50                   | push                eax

        $sequence_5 = { e8???????? 50 ff15???????? 3bf4 e8???????? 8945f4 6a00 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   3bf4                 | cmp                 esi, esp
            //   e8????????           |                     
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   6a00                 | push                0

        $sequence_6 = { ff36 e8???????? 8b06 8bd0 83e01f c1fa05 8b149500124700 }
            // n = 7, score = 200
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8bd0                 | mov                 edx, eax
            //   83e01f               | and                 eax, 0x1f
            //   c1fa05               | sar                 edx, 5
            //   8b149500124700       | mov                 edx, dword ptr [edx*4 + 0x471200]

        $sequence_7 = { 83c404 898530ecffff 8d450c 898524ecffff 8b8524ecffff 50 8b4d08 }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   898530ecffff         | mov                 dword ptr [ebp - 0x13d0], eax
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   898524ecffff         | mov                 dword ptr [ebp - 0x13dc], eax
            //   8b8524ecffff         | mov                 eax, dword ptr [ebp - 0x13dc]
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_8 = { 8b8d14ffffff 894dec a1???????? 50 }
            // n = 4, score = 200
            //   8b8d14ffffff         | mov                 ecx, dword ptr [ebp - 0xec]
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   a1????????           |                     
            //   50                   | push                eax

        $sequence_9 = { eb9c 8b45e4 52 8bcd 50 8d1578bf4100 e8???????? }
            // n = 7, score = 200
            //   eb9c                 | jmp                 0xffffff9e
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   52                   | push                edx
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d1578bf4100         | lea                 edx, [0x41bf78]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 1130496
}