rule win_squidloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.squidloader."
        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.squidloader"
        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 = { 0f114c2440 0f114c2450 0f114c2460 0f114c2470 }
            // n = 4, score = 200
            //   0f114c2440           | movups              xmmword ptr [esp + 0x40], xmm1
            //   0f114c2450           | movups              xmmword ptr [esp + 0x50], xmm1
            //   0f114c2460           | movups              xmmword ptr [esp + 0x60], xmm1
            //   0f114c2470           | movups              xmmword ptr [esp + 0x70], xmm1

        $sequence_1 = { 83f801 741c 33db 488d1544d10200 }
            // n = 4, score = 100
            //   83f801               | mov                 edi, dword ptr [esp + 0x38]
            //   741c                 | dec                 esp
            //   33db                 | mov                 esi, dword ptr [esp + 0x30]
            //   488d1544d10200       | dec                 esp

        $sequence_2 = { 41bc01000000 4c8d1d1309feff 4181f8e9fd0000 0f857a010000 }
            // n = 4, score = 100
            //   41bc01000000         | mov                 ecx, ebx
            //   4c8d1d1309feff       | dec                 eax
            //   4181f8e9fd0000       | lea                 edx, [0x1b0c5]
            //   0f857a010000         | inc                 ecx

        $sequence_3 = { 0f104f10 0f114e28 0f114618 488b0b }
            // n = 4, score = 100
            //   0f104f10             | dec                 eax
            //   0f114e28             | xor                 ecx, esp
            //   0f114618             | movups              xmm1, xmmword ptr [edi + 0x10]
            //   488b0b               | movups              xmmword ptr [esi + 0x14], xmm1

        $sequence_4 = { 0f104f10 0f114e34 0f114624 488b4c2468 }
            // n = 4, score = 100
            //   0f104f10             | movups              xmmword ptr [esi + 0x24], xmm0
            //   0f114e34             | movups              xmmword ptr [esi + 0x34], xmm1
            //   0f114624             | movups              xmm1, xmmword ptr [edi + 0x10]
            //   488b4c2468           | movups              xmmword ptr [esi + 0x28], xmm1

        $sequence_5 = { 488d15ccb00100 488bcb 488905???????? ff15???????? 488d15c5b00100 }
            // n = 5, score = 100
            //   488d15ccb00100       | dec                 eax
            //   488bcb               | lea                 edx, [0x1b0cc]
            //   488905????????       |                     
            //   ff15????????         |                     
            //   488d15c5b00100       | dec                 eax

        $sequence_6 = { 0f104f10 0f114e50 0f114640 896e68 }
            // n = 4, score = 100
            //   0f104f10             | test                ecx, ecx
            //   0f114e50             | je                  0x18
            //   0f114640             | movups              xmm1, xmmword ptr [edi + 0x10]
            //   896e68               | movups              xmmword ptr [esi + 0x28], xmm1

        $sequence_7 = { 0f104f10 0f114e68 488b4720 48894678 }
            // n = 4, score = 100
            //   0f104f10             | mov                 ecx, dword ptr [esp + 0x68]
            //   0f114e68             | dec                 eax
            //   488b4720             | xor                 ecx, esp
            //   48894678             | movups              xmm1, xmmword ptr [edi + 0x10]

        $sequence_8 = { 0f104f10 0f114e14 0f114604 0f10442428 }
            // n = 4, score = 100
            //   0f104f10             | movups              xmmword ptr [esi], xmm0
            //   0f114e14             | inc                 ebx
            //   0f114604             | movups              xmm1, xmmword ptr [edi + 0x10]
            //   0f10442428           | movups              xmmword ptr [esi + 0x10], xmm1

        $sequence_9 = { 0f104f10 0f114e10 0f1106 ffc3 488b4c2428 4831e1 }
            // n = 6, score = 100
            //   0f104f10             | movups              xmmword ptr [esp + 0x40], xmm1
            //   0f114e10             | movups              xmmword ptr [esp + 0x50], xmm1
            //   0f1106               | movups              xmmword ptr [esp + 0x60], xmm1
            //   ffc3                 | movups              xmmword ptr [esp + 0x70], xmm1
            //   488b4c2428           | movups              xmm1, xmmword ptr [edi + 0x10]
            //   4831e1               | movups              xmmword ptr [esi + 0x10], xmm1

        $sequence_10 = { e8???????? 837dd70c 0f9dc3 0f8dc5010000 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   837dd70c             | cmp                 dword ptr [ebp - 0x29], 0xc
            //   0f9dc3               | setge               bl
            //   0f8dc5010000         | jge                 0x1cb

        $sequence_11 = { eb05 488b7c2438 4c8b742430 4c3bf7 }
            // n = 4, score = 100
            //   eb05                 | mov                 esp, 1
            //   488b7c2438           | dec                 esp
            //   4c8b742430           | lea                 ebx, [0xfffe0913]
            //   4c3bf7               | inc                 ecx

        $sequence_12 = { 85c0 7426 83f901 488d05ab7c0200 }
            // n = 4, score = 100
            //   85c0                 | cmp                 eax, 0xfde9
            //   7426                 | jne                 0x187
            //   83f901               | jmp                 7
            //   488d05ab7c0200       | dec                 eax

        $sequence_13 = { 0f104f10 0f114e10 0f1106 e9???????? f30f100f f30f104710 f30f105314 }
            // n = 7, score = 100
            //   0f104f10             | mov                 ecx, eax
            //   0f114e10             | dec                 eax
            //   0f1106               | lea                 edx, [0x2901c]
            //   e9????????           |                     
            //   f30f100f             | dec                 eax
            //   f30f104710           | test                eax, eax
            //   f30f105314           | dec                 esp

        $sequence_14 = { ff15???????? 488bc8 488d151c900200 ff15???????? 4885c0 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   488bc8               | cmp                 esi, edi
            //   488d151c900200       | test                eax, eax
            //   ff15????????         |                     
            //   4885c0               | je                  0x2a

    condition:
        7 of them and filesize < 18701312
}