rule win_firechili_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.firechili."
        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.firechili"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 85c9 7876 4881fbfeffff7f 7610 b80d0000c0 488b5c2408 }
            // n = 6, score = 100
            //   85c9                 | dec                 esp
            //   7876                 | lea                 ecx, [esp + 0x2a8]
            //   4881fbfeffff7f       | mov                 ebx, eax
            //   7610                 | test                eax, eax
            //   b80d0000c0           | js                  0x162a
            //   488b5c2408           | dec                 eax

        $sequence_1 = { ff15???????? ff15???????? 4885ff 7428 4c3bf3 7442 85ed }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   ff15????????         |                     
            //   4885ff               | lea                 ecx, [ebp - 9]
            //   7428                 | mov                 ebx, eax
            //   4c3bf3               | test                eax, eax
            //   7442                 | js                  0x616
            //   85ed                 | dec                 eax

        $sequence_2 = { c684249800000000 4c8bf3 498bdc 85ed 7435 488b842488000000 }
            // n = 6, score = 100
            //   c684249800000000     | mov                 edx, dword ptr [edx + 0x10]
            //   4c8bf3               | dec                 esp
            //   498bdc               | lea                 eax, [esp + 0x50]
            //   85ed                 | dec                 ecx
            //   7435                 | mov                 ecx, dword ptr [edx + 8]
            //   488b842488000000     | test                eax, eax

        $sequence_3 = { 400fb6ff 488d4c2420 84c0 410f45ff ff15???????? 4084ff 750e }
            // n = 7, score = 100
            //   400fb6ff             | dec                 eax
            //   488d4c2420           | cmp                 eax, 0x210
            //   84c0                 | je                  0x7c7
            //   410f45ff             | mov                 eax, 4
            //   ff15????????         |                     
            //   4084ff               | dec                 eax
            //   750e                 | lea                 edi, [edi + 0x80]

        $sequence_4 = { 48895c2430 488b9ab8000000 4885db 0f8496000000 817b181b001200 }
            // n = 5, score = 100
            //   48895c2430           | mov                 dword ptr [esp + 0x28], 0x26
            //   488b9ab8000000       | inc                 ebp
            //   4885db               | xor                 eax, eax
            //   0f8496000000         | dec                 eax
            //   817b181b001200       | mov                 dword ptr [esp + 0x20], esi

        $sequence_5 = { 0f11459f ff15???????? 488d4d17 ff15???????? 4885c0 7413 488d5567 }
            // n = 7, score = 100
            //   0f11459f             | jl                  0x15d3
            //   ff15????????         |                     
            //   488d4d17             | dec                 ebp
            //   ff15????????         |                     
            //   4885c0               | test                ecx, ecx
            //   7413                 | je                  0x15e1
            //   488d5567             | dec                 esp

        $sequence_6 = { 7c22 4c8b0d???????? 4d85c9 740d 4c8d442430 488bcb 41ffd1 }
            // n = 7, score = 100
            //   7c22                 | dec                 eax
            //   4c8b0d????????       |                     
            //   4d85c9               | mov                 edi, dword ptr [esp + 0x10]
            //   740d                 | ret                 
            //   4c8d442430           | dec                 eax
            //   488bcb               | mov                 ebx, dword ptr [esp + 8]
            //   41ffd1               | mov                 word ptr [esi], di

        $sequence_7 = { 8b03 4889442440 4885f6 780a 488d4c2420 e8???????? }
            // n = 6, score = 100
            //   8b03                 | add                 esp, 0x230
            //   4889442440           | pop                 ebx
            //   4885f6               | dec                 eax
            //   780a                 | test                ebx, ebx
            //   488d4c2420           | je                  0x17f1
            //   e8????????           |                     

        $sequence_8 = { 664585db 750c 410fb7d0 488bcb 48d1ea eb05 b80d0000c0 }
            // n = 7, score = 100
            //   664585db             | dec                 eax
            //   750c                 | test                ebp, ebp
            //   410fb7d0             | je                  0x7cc
            //   488bcb               | mov                 edx, 0x767473
            //   48d1ea               | dec                 esp
            //   eb05                 | mov                 dword ptr [esp + 0x30], esi
            //   b80d0000c0           | inc                 ebp

        $sequence_9 = { 4c89742438 4533f6 90 483bde 742d 488b07 }
            // n = 6, score = 100
            //   4c89742438           | cmp                 ecx, 1
            //   4533f6               | jne                 0xe5e
            //   90                   | dec                 eax
            //   483bde               | mov                 edi, dword ptr [edx + 0x20]
            //   742d                 | dec                 eax
            //   488b07               | test                edi, edi

    condition:
        7 of them and filesize < 91136
}