rule win_darkloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { ff15???????? 8bd8 8d442428 50 6800020000 8d442440 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax
            //   6800020000           | push                0x200
            //   8d442440             | lea                 eax, [esp + 0x40]

        $sequence_1 = { 3bd1 72e3 8b35???????? 6a3a 57 }
            // n = 5, score = 100
            //   3bd1                 | cmp                 edx, ecx
            //   72e3                 | jb                  0xffffffe5
            //   8b35????????         |                     
            //   6a3a                 | push                0x3a
            //   57                   | push                edi

        $sequence_2 = { 2b4a0c 034d14 3b4d10 1bc0 }
            // n = 4, score = 100
            //   2b4a0c               | sub                 ecx, dword ptr [edx + 0xc]
            //   034d14               | add                 ecx, dword ptr [ebp + 0x14]
            //   3b4d10               | cmp                 ecx, dword ptr [ebp + 0x10]
            //   1bc0                 | sbb                 eax, eax

        $sequence_3 = { 8931 e8???????? 83c410 33c0 40 ebaf 83ec18 }
            // n = 7, score = 100
            //   8931                 | mov                 dword ptr [ecx], esi
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   ebaf                 | jmp                 0xffffffb1
            //   83ec18               | sub                 esp, 0x18

        $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 = { ffd6 68???????? ffb7dc010000 8987bc010000 ffd6 68???????? }
            // n = 6, score = 100
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   ffb7dc010000         | push                dword ptr [edi + 0x1dc]
            //   8987bc010000         | mov                 dword ptr [edi + 0x1bc], eax
            //   ffd6                 | call                esi
            //   68????????           |                     

        $sequence_6 = { 84c0 740b 80f90d 7519 }
            // n = 4, score = 100
            //   84c0                 | test                al, al
            //   740b                 | je                  0xd
            //   80f90d               | cmp                 cl, 0xd
            //   7519                 | jne                 0x1b

        $sequence_7 = { 85c0 741f 8b04b1 03c7 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   741f                 | je                  0x21
            //   8b04b1               | mov                 eax, dword ptr [ecx + esi*4]
            //   03c7                 | add                 eax, edi

        $sequence_8 = { 6a08 8bf8 be???????? 59 8d442414 f3a5 }
            // n = 6, score = 100
            //   6a08                 | push                8
            //   8bf8                 | mov                 edi, eax
            //   be????????           |                     
            //   59                   | pop                 ecx
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]

        $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
}