rule win_bitter_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 2b34bd00124700 c1fe06 8bc7 c1e005 }
            // n = 4, score = 200
            //   2b34bd00124700       | sub                 esi, dword ptr [edi*4 + 0x471200]
            //   c1fe06               | sar                 esi, 6
            //   8bc7                 | mov                 eax, edi
            //   c1e005               | shl                 eax, 5

        $sequence_1 = { 83c404 83c001 50 e8???????? 83c404 8945f4 8d85dcfeffff }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   83c001               | add                 eax, 1
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8d85dcfeffff         | lea                 eax, [ebp - 0x124]

        $sequence_2 = { 8b4df4 51 e8???????? 83c408 8bf4 8b8580edffff }
            // n = 6, score = 200
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bf4                 | mov                 esi, esp
            //   8b8580edffff         | mov                 eax, dword ptr [ebp - 0x1280]

        $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 = { 8945fc 8bf4 8d8568feffff 50 6a02 ff15???????? 3bf4 }
            // n = 7, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8bf4                 | mov                 esi, esp
            //   8d8568feffff         | lea                 eax, [ebp - 0x198]
            //   50                   | push                eax
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   3bf4                 | cmp                 esi, esp

        $sequence_5 = { 50 8d15c8324200 e8???????? 58 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   8d15c8324200         | lea                 edx, [0x4232c8]
            //   e8????????           |                     
            //   58                   | pop                 eax

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

        $sequence_7 = { 6a01 68???????? 8b85e8feffff 2b85dcfeffff 05???????? 50 }
            // n = 6, score = 200
            //   6a01                 | push                1
            //   68????????           |                     
            //   8b85e8feffff         | mov                 eax, dword ptr [ebp - 0x118]
            //   2b85dcfeffff         | sub                 eax, dword ptr [ebp - 0x124]
            //   05????????           |                     
            //   50                   | push                eax

        $sequence_8 = { 8bec b864240000 e8???????? 53 }
            // n = 4, score = 200
            //   8bec                 | mov                 ebp, esp
            //   b864240000           | mov                 eax, 0x2464
            //   e8????????           |                     
            //   53                   | push                ebx

        $sequence_9 = { eb44 8b8534f0ffff 50 8b8d9cfeffff 51 8d9510c9ffff 52 }
            // n = 7, score = 200
            //   eb44                 | jmp                 0x46
            //   8b8534f0ffff         | mov                 eax, dword ptr [ebp - 0xfcc]
            //   50                   | push                eax
            //   8b8d9cfeffff         | mov                 ecx, dword ptr [ebp - 0x164]
            //   51                   | push                ecx
            //   8d9510c9ffff         | lea                 edx, [ebp - 0x36f0]
            //   52                   | push                edx

    condition:
        7 of them and filesize < 1130496
}