rule win_jimmy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.jimmy."
        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.jimmy"
        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 = { 8b450c 8b4df8 8908 eb11 e8???????? }
            // n = 5, score = 400
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   eb11                 | jmp                 0x13
            //   e8????????           |                     

        $sequence_1 = { 8945f0 a1???????? 83786800 741c 6a00 6a00 8d45e8 }
            // n = 7, score = 400
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   a1????????           |                     
            //   83786800             | cmp                 dword ptr [eax + 0x68], 0
            //   741c                 | je                  0x1e
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d45e8               | lea                 eax, [ebp - 0x18]

        $sequence_2 = { c745fc12030900 e9???????? 837de805 752c ff75e4 8b4508 8b4028 }
            // n = 7, score = 400
            //   c745fc12030900       | mov                 dword ptr [ebp - 4], 0x90312
            //   e9????????           |                     
            //   837de805             | cmp                 dword ptr [ebp - 0x18], 5
            //   752c                 | jne                 0x2e
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]

        $sequence_3 = { 7402 eb10 8b45e8 40 8945e8 8b45e4 40 }
            // n = 7, score = 400
            //   7402                 | je                  4
            //   eb10                 | jmp                 0x12
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   40                   | inc                 eax
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   40                   | inc                 eax

        $sequence_4 = { 85c0 7428 ff7514 ff75dc e8???????? 59 }
            // n = 6, score = 400
            //   85c0                 | test                eax, eax
            //   7428                 | je                  0x2a
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ff75dc               | push                dword ptr [ebp - 0x24]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_5 = { 50 e8???????? 59 ffb580fdffff e8???????? 59 85c0 }
            // n = 7, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   ffb580fdffff         | push                dword ptr [ebp - 0x280]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax

        $sequence_6 = { 8b45ec 0fb600 48 50 8b45f0 ff30 e8???????? }
            // n = 7, score = 400
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   48                   | dec                 eax
            //   50                   | push                eax
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   ff30                 | push                dword ptr [eax]
            //   e8????????           |                     

        $sequence_7 = { 59 0fb6c0 85c0 7418 6a00 ff75f4 }
            // n = 6, score = 400
            //   59                   | pop                 ecx
            //   0fb6c0               | movzx               eax, al
            //   85c0                 | test                eax, eax
            //   7418                 | je                  0x1a
            //   6a00                 | push                0
            //   ff75f4               | push                dword ptr [ebp - 0xc]

        $sequence_8 = { e8???????? 59 59 8945fc ff7508 8d45f0 50 }
            // n = 7, score = 400
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax

        $sequence_9 = { 740d 817dfc18030980 0f85ac000000 8b4508 8b4d08 8b402c 3b4128 }
            // n = 7, score = 400
            //   740d                 | je                  0xf
            //   817dfc18030980       | cmp                 dword ptr [ebp - 4], 0x80090318
            //   0f85ac000000         | jne                 0xb2
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b402c               | mov                 eax, dword ptr [eax + 0x2c]
            //   3b4128               | cmp                 eax, dword ptr [ecx + 0x28]

    condition:
        7 of them and filesize < 188416
}