rule win_bitter_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 68???????? e8???????? 83c40c 6a01 68???????? 8b85e8feffff 2b85dcfeffff }
            // n = 7, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a01                 | push                1
            //   68????????           |                     
            //   8b85e8feffff         | mov                 eax, dword ptr [ebp - 0x118]
            //   2b85dcfeffff         | sub                 eax, dword ptr [ebp - 0x124]

        $sequence_1 = { 8945f8 837df8ff 7504 b001 eb15 8bf4 8b45f8 }
            // n = 7, score = 200
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   837df8ff             | cmp                 dword ptr [ebp - 8], -1
            //   7504                 | jne                 6
            //   b001                 | mov                 al, 1
            //   eb15                 | jmp                 0x17
            //   8bf4                 | mov                 esi, esp
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_2 = { 3de1070000 7514 e8???????? e8???????? e8???????? e9???????? }
            // n = 6, score = 200
            //   3de1070000           | cmp                 eax, 0x7e1
            //   7514                 | jne                 0x16
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   e9????????           |                     

        $sequence_3 = { 7658 a1???????? 33d2 b97c230000 f7f1 a3???????? a1???????? }
            // n = 7, score = 200
            //   7658                 | jbe                 0x5a
            //   a1????????           |                     
            //   33d2                 | xor                 edx, edx
            //   b97c230000           | mov                 ecx, 0x237c
            //   f7f1                 | div                 ecx
            //   a3????????           |                     
            //   a1????????           |                     

        $sequence_4 = { 83c004 8945d4 5f 5e }
            // n = 4, score = 200
            //   83c004               | add                 eax, 4
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_5 = { 8955dc 8b45dc 99 b90a000000 f7f9 }
            // n = 5, score = 200
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   99                   | cdq                 
            //   b90a000000           | mov                 ecx, 0xa
            //   f7f9                 | idiv                ecx

        $sequence_6 = { e8???????? 6a0d 68???????? e8???????? 83c408 a1???????? 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   6a0d                 | push                0xd
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   a1????????           |                     
            //   50                   | push                eax

        $sequence_7 = { 52 8bcd 50 8d1578bf4100 e8???????? 58 }
            // n = 6, score = 200
            //   52                   | push                edx
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d1578bf4100         | lea                 edx, [0x41bf78]
            //   e8????????           |                     
            //   58                   | pop                 eax

        $sequence_8 = { 50 e8???????? 83c40c a1???????? a3???????? 8bf4 6a00 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   a1????????           |                     
            //   a3????????           |                     
            //   8bf4                 | mov                 esi, esp
            //   6a00                 | push                0

        $sequence_9 = { 50 8d8d74dbffff 51 8b954cd9ffff 8d84157cdcffff 50 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8d8d74dbffff         | lea                 ecx, [ebp - 0x248c]
            //   51                   | push                ecx
            //   8b954cd9ffff         | mov                 edx, dword ptr [ebp - 0x26b4]
            //   8d84157cdcffff       | lea                 eax, [ebp + edx - 0x2384]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 1130496
}