rule win_quarterrig_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.quarterrig."
        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.quarterrig"
        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 = { 488b4c2430 e8???????? 488bc7 488b8d40030000 4833cc e8???????? 4881c450040000 }
            // n = 7, score = 100
            //   488b4c2430           | dec                 eax
            //   e8????????           |                     
            //   488bc7               | add                 esp, 0x40
            //   488b8d40030000       | pop                 ebx
            //   4833cc               | ret                 
            //   e8????????           |                     
            //   4881c450040000       | dec                 eax

        $sequence_1 = { 48ffc2 4883fa03 72de 41887803 498bd0 }
            // n = 5, score = 100
            //   48ffc2               | dec                 eax
            //   4883fa03             | lea                 ecx, [0x643df]
            //   72de                 | dec                 eax
            //   41887803             | mov                 edi, eax
            //   498bd0               | dec                 eax

        $sequence_2 = { 7509 483b1f 0f85d6000000 488d4c2420 e8???????? 488bd8 44386822 }
            // n = 7, score = 100
            //   7509                 | mov                 dword ptr [ebp - 0x58], ebp
            //   483b1f               | mov                 esi, 0xf
            //   0f85d6000000         | dec                 ecx
            //   488d4c2420           | cmp                 edx, edi
            //   e8????????           |                     
            //   488bd8               | jb                  0x9f4
            //   44386822             | dec                 eax

        $sequence_3 = { eb4d 488b8100010000 4885c0 7403 f0ff08 488d0507050200 48899900010000 }
            // n = 7, score = 100
            //   eb4d                 | sub                 esp, 0x38
            //   488b8100010000       | dec                 eax
            //   4885c0               | xor                 eax, esp
            //   7403                 | nop                 
            //   f0ff08               | dec                 eax
            //   488d0507050200       | lea                 ecx, [0x605df]
            //   48899900010000       | jmp                 0x11ca

        $sequence_4 = { 428a8c0978a60400 482bd0 8b42fc d3e8 49895008 41894018 0fb60a }
            // n = 7, score = 100
            //   428a8c0978a60400     | dec                 eax
            //   482bd0               | sub                 esp, 0x38
            //   8b42fc               | dec                 eax
            //   d3e8                 | xor                 eax, esp
            //   49895008             | dec                 eax
            //   41894018             | mov                 dword ptr [esp + 0x28], eax
            //   0fb60a               | mov                 word ptr [esp + 0x20], 0xee43

        $sequence_5 = { 488b5330 4883fa10 720c 48ffc2 488b4b18 e8???????? 4883632800 }
            // n = 7, score = 100
            //   488b5330             | sub                 esp, 0x20
            //   4883fa10             | dec                 eax
            //   720c                 | mov                 ebx, ecx
            //   48ffc2               | dec                 esp
            //   488b4b18             | lea                 ecx, [0x1ca88]
            //   e8????????           |                     
            //   4883632800           | mov                 ecx, 0x1c

        $sequence_6 = { 83c804 89441910 23441914 754e e8???????? 84c0 750b }
            // n = 7, score = 100
            //   83c804               | dec                 eax
            //   89441910             | mov                 dword ptr [ebp + 0x268], edi
            //   23441914             | inc                 esp
            //   754e                 | mov                 byte ptr [ebp + 0x250], ch
            //   e8????????           |                     
            //   84c0                 | dec                 eax
            //   750b                 | mov                 edx, eax

        $sequence_7 = { 3905???????? 7f19 488d0564820600 488b4c2428 4833cc e8???????? 4883c438 }
            // n = 7, score = 100
            //   3905????????         |                     
            //   7f19                 | mov                 ecx, edi
            //   488d0564820600       | dec                 esp
            //   488b4c2428           | mov                 edx, eax
            //   4833cc               | inc                 eax
            //   e8????????           |                     
            //   4883c438             | cmp                 byte ptr [eax + 2], dh

        $sequence_8 = { 48895c2408 57 4883ec20 488d1dd3710300 488d3dcc710300 eb12 488b03 }
            // n = 7, score = 100
            //   48895c2408           | mov                 dword ptr [ebp - 0x20], 0xbd6e7c61
            //   57                   | mov                 dword ptr [ebp - 0x1c], 0x680f07d
            //   4883ec20             | mov                 dword ptr [ebp - 0x18], 0xb5697e22
            //   488d1dd3710300       | mov                 word ptr [ebp - 0x14], 0x9962
            //   488d3dcc710300       | dec                 eax
            //   eb12                 | xor                 eax, esp
            //   488b03               | dec                 eax

        $sequence_9 = { 488d15f6ea0400 488d0ddfea0400 4883c420 5b 48ff25???????? 488d0ddcea0400 ff15???????? }
            // n = 7, score = 100
            //   488d15f6ea0400       | mov                 dword ptr [ebp + 0x10], ecx
            //   488d0ddfea0400       | dec                 eax
            //   4883c420             | xor                 eax, esp
            //   5b                   | dec                 eax
            //   48ff25????????       |                     
            //   488d0ddcea0400       | mov                 dword ptr [ebp + 0x2d8], eax
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 971776
}