rule win_enigma_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.enigma_loader."
        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.enigma_loader"
        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 = { 488d8a40000000 e9???????? 488d8a40010000 e9???????? 488d8a20010000 e9???????? }
            // n = 6, score = 100
            //   488d8a40000000       | mov                 ecx, dword ptr [ecx - 8]
            //   e9????????           |                     
            //   488d8a40010000       | dec                 eax
            //   e9????????           |                     
            //   488d8a20010000       | sub                 eax, ecx
            //   e9????????           |                     

        $sequence_1 = { 0f1005???????? 0f114597 0f100d???????? 0f114da7 8a05???????? 8845b7 448bc3 }
            // n = 7, score = 100
            //   0f1005????????       |                     
            //   0f114597             | mov                 ecx, ebx
            //   0f100d????????       |                     
            //   0f114da7             | mov                 edx, 0x81504714
            //   8a05????????         |                     
            //   8845b7               | mov                 ecx, 0xc
            //   448bc3               | lea                 edx, [esi + 1]

        $sequence_2 = { ff15???????? b801000000 4c8d5c2470 498b5b10 498b6b18 498b7320 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   b801000000           | dec                 eax
            //   4c8d5c2470           | sar                 eax, 3
            //   498b5b10             | mov                 byte ptr [ebp + 0x48], 5
            //   498b6b18             | nop                 
            //   498b7320             | dec                 eax

        $sequence_3 = { 488d040a 488bf5 483bc5 480f43f0 493bf0 0f8728010000 488bce }
            // n = 7, score = 100
            //   488d040a             | dec                 eax
            //   488bf5               | test                edx, edx
            //   483bc5               | je                  0x264
            //   480f43f0             | dec                 eax
            //   493bf0               | mov                 ecx, ebx
            //   0f8728010000         | dec                 ecx
            //   488bce               | sub                 edi, ecx

        $sequence_4 = { 488bd9 4c8d0d48530100 33c9 4c8d0537530100 488d1538530100 e8???????? }
            // n = 6, score = 100
            //   488bd9               | dec                 eax
            //   4c8d0d48530100       | add                 esp, 0x20
            //   33c9                 | inc                 ecx
            //   4c8d0537530100       | pop                 edi
            //   488d1538530100       | inc                 ecx
            //   e8????????           |                     

        $sequence_5 = { e8???????? cc e8???????? cc e8???????? 90 498bd6 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   cc                   | shr                 eax, cl
            //   e8????????           |                     
            //   cc                   | dec                 ebp
            //   e8????????           |                     
            //   90                   | mov                 dword ptr [edi + 8], eax
            //   498bd6               | inc                 ecx

        $sequence_6 = { 488bcb ffd0 418bc7 e9???????? ba3eefbb12 e8???????? 488bcb }
            // n = 7, score = 100
            //   488bcb               | mov                 eax, ecx
            //   ffd0                 | dec                 eax
            //   418bc7               | cmp                 edx, 0x1000
            //   e9????????           |                     
            //   ba3eefbb12           | dec                 eax
            //   e8????????           |                     
            //   488bcb               | mov                 edx, dword ptr [ebp - 0x28]

        $sequence_7 = { 488bcb ffd0 e9???????? ba175bc35c 418bdf 8bcb e8???????? }
            // n = 7, score = 100
            //   488bcb               | dec                 eax
            //   ffd0                 | inc                 edx
            //   e9????????           |                     
            //   ba175bc35c           | dec                 eax
            //   418bdf               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8bcb                 | dec                 eax
            //   e8????????           |                     

        $sequence_8 = { 488d055e6afeff 0fb68cb8a2b10200 0fb6b4b8a3b10200 8bd9 48c1e302 4c8bc3 8d040e }
            // n = 7, score = 100
            //   488d055e6afeff       | dec                 eax
            //   0fb68cb8a2b10200     | mov                 eax, dword ptr [ebx + 0x28]
            //   0fb6b4b8a3b10200     | inc                 eax
            //   8bd9                 | mov                 byte ptr [ebx + 0x18], bh
            //   48c1e302             | dec                 eax
            //   4c8bc3               | mov                 ecx, ebx
            //   8d040e               | cmp                 eax, 0x5c

        $sequence_9 = { 773b 498bc8 e8???????? 488b6c2458 4a8d0ce3 48891f 498bc6 }
            // n = 7, score = 100
            //   773b                 | mov                 al, byte ptr [ebp - 0x20]
            //   498bc8               | dec                 esp
            //   e8????????           |                     
            //   488b6c2458           | mov                 eax, dword ptr [ebp - 0x18]
            //   4a8d0ce3             | mov                 byte ptr [ebp - 0x20], 0
            //   48891f               | dec                 eax
            //   498bc6               | and                 dword ptr [ebp - 0x18], 0

    condition:
        7 of them and filesize < 798720
}