rule win_stilachi_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.stilachi_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.stilachi_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 = { e8???????? 488bcd e8???????? 33f6 e9???????? 4c8b4b20 488b0b }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488bcd               | mov                 eax, dword ptr [edi + 0x170]
            //   e8????????           |                     
            //   33f6                 | dec                 eax
            //   e9????????           |                     
            //   4c8b4b20             | mov                 ecx, dword ptr [esp + 0x48]
            //   488b0b               | inc                 esp

        $sequence_1 = { ff15???????? b91f9fa753 8bd8 e8???????? 8bcb ffd0 4c8be0 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   b91f9fa753           | movzx               eax, word ptr [edx - 2]
            //   8bd8                 | dec                 eax
            //   e8????????           |                     
            //   8bcb                 | sub                 edx, 2
            //   ffd0                 | inc                 ecx
            //   4c8be0               | cmp                 eax, ecx

        $sequence_2 = { ff5030 8bd8 85c0 7515 4c396d48 7e0f 498b0424 }
            // n = 7, score = 100
            //   ff5030               | je                  0x2dd
            //   8bd8                 | dec                 ecx
            //   85c0                 | mov                 ebx, ebx
            //   7515                 | inc                 ebp
            //   4c396d48             | mov                 esi, ebx
            //   7e0f                 | dec                 ebp
            //   498b0424             | mov                 ebp, ebx

        $sequence_3 = { e9???????? 488b0b ba00900000 66855114 740a 4883c430 5b }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488b0b               | dec                 eax
            //   ba00900000           | mov                 ecx, dword ptr [eax + 0x18]
            //   66855114             | dec                 ecx
            //   740a                 | mov                 dword ptr [ecx], ecx
            //   4883c430             | inc                 ecx
            //   5b                   | dec                 dword ptr [ebx + 0x38]

        $sequence_4 = { e8???????? 899c24cc000000 eb12 bb02000000 4d8bc7 8bd3 488bcd }
            // n = 7, score = 100
            //   e8????????           |                     
            //   899c24cc000000       | dec                 esp
            //   eb12                 | add                 esi, eax
            //   bb02000000           | dec                 ecx
            //   4d8bc7               | mov                 eax, esi
            //   8bd3                 | dec                 ecx
            //   488bcd               | sub                 eax, ebp

        $sequence_5 = { e8???????? 488b5580 4533c0 8bc8 41b901000000 85c9 750d }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488b5580             | dec                 eax
            //   4533c0               | mov                 dword ptr [esp + 0x20], eax
            //   8bc8                 | inc                 esp
            //   41b901000000         | lea                 ecx, [ebx - 0xf]
            //   85c9                 | dec                 esp
            //   750d                 | lea                 eax, [esi + 0xf]

        $sequence_6 = { ffc9 7467 ffc9 0f852b040000 488b5e08 488d4548 418bcb }
            // n = 7, score = 100
            //   ffc9                 | lea                 ecx, [0xfff4b6a4]
            //   7467                 | xor                 edx, edx
            //   ffc9                 | mov                 ecx, 0xc8
            //   0f852b040000         | dec                 eax
            //   488b5e08             | mov                 dword ptr [ebx + 0x20], eax
            //   488d4548             | dec                 esp
            //   418bcb               | mov                 dword ptr [ecx + 0x20], eax

        $sequence_7 = { e8???????? ba04000000 488bcd 4c8bf0 e8???????? 488bd6 448bc0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   ba04000000           | imul                ebx, ebx, 0x38
            //   488bcd               | dec                 eax
            //   4c8bf0               | mov                 edi, dword ptr [eax + ecx*8]
            //   e8????????           |                     
            //   488bd6               | dec                 ecx
            //   448bc0               | add                 ebx, ebp

        $sequence_8 = { e8???????? b201 488bcf 488bf0 e8???????? 488bcb 4863f8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   b201                 | jge                 0x438
            //   488bcf               | dec                 eax
            //   488bf0               | and                 dword ptr [esp + 0x20], 0
            //   e8????????           |                     
            //   488bcb               | dec                 eax
            //   4863f8               | arpl                ax, bp

        $sequence_9 = { e8???????? 488b4720 4885c0 7447 833800 458bee 7e38 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488b4720             | dec                 eax
            //   4885c0               | mov                 dword ptr [ebx + 0x10], eax
            //   7447                 | dec                 eax
            //   833800               | mov                 dword ptr [edi], ebx
            //   458bee               | dec                 eax
            //   7e38                 | lea                 eax, [ebx + 0x1c]

    condition:
        7 of them and filesize < 2629632
}