rule win_rektloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rektloader."
        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.rektloader"
        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 = { 55 8bec 83ec08 b804000000 6bc80d 8b9178995600 3315???????? }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec08               | sub                 esp, 8
            //   b804000000           | mov                 eax, 4
            //   6bc80d               | imul                ecx, eax, 0xd
            //   8b9178995600         | mov                 edx, dword ptr [ecx + 0x569978]
            //   3315????????         |                     

        $sequence_1 = { 83c408 8b4df8 e8???????? 8b10 52 8d45f3 }
            // n = 6, score = 100
            //   83c408               | add                 esp, 8
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   52                   | push                edx
            //   8d45f3               | lea                 eax, [ebp - 0xd]

        $sequence_2 = { 8b8d34ffffff 0fbe940d14ffffff 899528ffffff 8b8528ffffff 83e820 898528ffffff 83bd28ffffff58 }
            // n = 7, score = 100
            //   8b8d34ffffff         | mov                 ecx, dword ptr [ebp - 0xcc]
            //   0fbe940d14ffffff     | movsx               edx, byte ptr [ebp + ecx - 0xec]
            //   899528ffffff         | mov                 dword ptr [ebp - 0xd8], edx
            //   8b8528ffffff         | mov                 eax, dword ptr [ebp - 0xd8]
            //   83e820               | sub                 eax, 0x20
            //   898528ffffff         | mov                 dword ptr [ebp - 0xd8], eax
            //   83bd28ffffff58       | cmp                 dword ptr [ebp - 0xd8], 0x58

        $sequence_3 = { 8d4df8 51 8d55d8 52 8b45d4 83c040 50 }
            // n = 7, score = 100
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   51                   | push                ecx
            //   8d55d8               | lea                 edx, [ebp - 0x28]
            //   52                   | push                edx
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   83c040               | add                 eax, 0x40
            //   50                   | push                eax

        $sequence_4 = { 3b8578ffffff 7d22 8b4da0 8b5594 8a8298b05200 8801 8b4da0 }
            // n = 7, score = 100
            //   3b8578ffffff         | cmp                 eax, dword ptr [ebp - 0x88]
            //   7d22                 | jge                 0x24
            //   8b4da0               | mov                 ecx, dword ptr [ebp - 0x60]
            //   8b5594               | mov                 edx, dword ptr [ebp - 0x6c]
            //   8a8298b05200         | mov                 al, byte ptr [edx + 0x52b098]
            //   8801                 | mov                 byte ptr [ecx], al
            //   8b4da0               | mov                 ecx, dword ptr [ebp - 0x60]

        $sequence_5 = { c745fc00000000 0fb64514 85c0 7454 8d8d30feffff 51 8b4d18 }
            // n = 7, score = 100
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   0fb64514             | movzx               eax, byte ptr [ebp + 0x14]
            //   85c0                 | test                eax, eax
            //   7454                 | je                  0x56
            //   8d8d30feffff         | lea                 ecx, [ebp - 0x1d0]
            //   51                   | push                ecx
            //   8b4d18               | mov                 ecx, dword ptr [ebp + 0x18]

        $sequence_6 = { e9???????? c3 8b857cfeffff 83e020 0f8412000000 83a57cfeffffdf 8d8d48ffffff }
            // n = 7, score = 100
            //   e9????????           |                     
            //   c3                   | ret                 
            //   8b857cfeffff         | mov                 eax, dword ptr [ebp - 0x184]
            //   83e020               | and                 eax, 0x20
            //   0f8412000000         | je                  0x18
            //   83a57cfeffffdf       | and                 dword ptr [ebp - 0x184], 0xffffffdf
            //   8d8d48ffffff         | lea                 ecx, [ebp - 0xb8]

        $sequence_7 = { e8???????? 8945f8 8b45f8 c7401400000000 8b4df8 c741180f000000 c645f700 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   c7401400000000       | mov                 dword ptr [eax + 0x14], 0
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   c741180f000000       | mov                 dword ptr [ecx + 0x18], 0xf
            //   c645f700             | mov                 byte ptr [ebp - 9], 0

        $sequence_8 = { 8b45e8 8945cc c745fcffffffff 8d4dd8 e8???????? 8b45cc 52 }
            // n = 7, score = 100
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   52                   | push                edx

        $sequence_9 = { 007091 4a 007091 4a 005f91 4a }
            // n = 6, score = 100
            //   007091               | add                 byte ptr [eax - 0x6f], dh
            //   4a                   | dec                 edx
            //   007091               | add                 byte ptr [eax - 0x6f], dh
            //   4a                   | dec                 edx
            //   005f91               | add                 byte ptr [edi - 0x6f], bl
            //   4a                   | dec                 edx

    condition:
        7 of them and filesize < 3080192
}