rule win_darkloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.darkloader."
        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.darkloader"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8365fc00 ff15???????? 59 85c0 b9???????? }
            // n = 5, score = 100
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   b9????????           |                     

        $sequence_1 = { 53 e8???????? 8bb42434020000 c1e607 68???????? 89b42438020000 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8bb42434020000       | mov                 esi, dword ptr [esp + 0x234]
            //   c1e607               | shl                 esi, 7
            //   68????????           |                     
            //   89b42438020000       | mov                 dword ptr [esp + 0x238], esi

        $sequence_2 = { ffd6 6a03 59 2bcf 6a2f 8d2c01 }
            // n = 6, score = 100
            //   ffd6                 | call                esi
            //   6a03                 | push                3
            //   59                   | pop                 ecx
            //   2bcf                 | sub                 ecx, edi
            //   6a2f                 | push                0x2f
            //   8d2c01               | lea                 ebp, [ecx + eax]

        $sequence_3 = { 89442418 8b4818 894c241c 85c9 0f84b3000000 8b4020 }
            // n = 6, score = 100
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   8b4818               | mov                 ecx, dword ptr [eax + 0x18]
            //   894c241c             | mov                 dword ptr [esp + 0x1c], ecx
            //   85c9                 | test                ecx, ecx
            //   0f84b3000000         | je                  0xb9
            //   8b4020               | mov                 eax, dword ptr [eax + 0x20]

        $sequence_4 = { ffd5 a1???????? 40 85c0 7e5e 8bfe 8d8f10610010 }
            // n = 7, score = 100
            //   ffd5                 | call                ebp
            //   a1????????           |                     
            //   40                   | inc                 eax
            //   85c0                 | test                eax, eax
            //   7e5e                 | jle                 0x60
            //   8bfe                 | mov                 edi, esi
            //   8d8f10610010         | lea                 ecx, [edi + 0x10006110]

        $sequence_5 = { 8d042f 50 e8???????? 8b6c2428 8bf0 ff7510 53 }
            // n = 7, score = 100
            //   8d042f               | lea                 eax, [edi + ebp]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   8bf0                 | mov                 esi, eax
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   53                   | push                ebx

        $sequence_6 = { 56 57 e8???????? 8bd8 59 59 85ff }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85ff                 | test                edi, edi

        $sequence_7 = { 51 50 e8???????? 8b4c242c 83c41c 83f9ff }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4c242c             | mov                 ecx, dword ptr [esp + 0x2c]
            //   83c41c               | add                 esp, 0x1c
            //   83f9ff               | cmp                 ecx, -1

        $sequence_8 = { 6bc503 40 50 e8???????? be???????? 8d7c2418 }
            // n = 6, score = 100
            //   6bc503               | imul                eax, ebp, 3
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   e8????????           |                     
            //   be????????           |                     
            //   8d7c2418             | lea                 edi, [esp + 0x18]

        $sequence_9 = { ff15???????? 6a3b 8d7003 56 ff15???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   6a3b                 | push                0x3b
            //   8d7003               | lea                 esi, [eax + 3]
            //   56                   | push                esi
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 124928
}