rule win_apocalipto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.apocalipto."
        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.apocalipto"
        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 = { 880e b967666666 89d8 f7e9 89d1 c1f902 }
            // n = 6, score = 100
            //   880e                 | mov                 byte ptr [esi], cl
            //   b967666666           | mov                 ecx, 0x66666667
            //   89d8                 | mov                 eax, ebx
            //   f7e9                 | imul                ecx
            //   89d1                 | mov                 ecx, edx
            //   c1f902               | sar                 ecx, 2

        $sequence_1 = { 891c24 ff15???????? 83ec08 a3???????? 85c0 0f84ad070000 c744240800000000 }
            // n = 7, score = 100
            //   891c24               | mov                 dword ptr [esp], ebx
            //   ff15????????         |                     
            //   83ec08               | sub                 esp, 8
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84ad070000         | je                  0x7b3
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0

        $sequence_2 = { 6690 42 803a00 75fa 8a0b 84c9 }
            // n = 6, score = 100
            //   6690                 | nop                 
            //   42                   | inc                 edx
            //   803a00               | cmp                 byte ptr [edx], 0
            //   75fa                 | jne                 0xfffffffc
            //   8a0b                 | mov                 cl, byte ptr [ebx]
            //   84c9                 | test                cl, cl

        $sequence_3 = { 3b550c 7d25 803800 7430 89c2 6690 }
            // n = 6, score = 100
            //   3b550c               | cmp                 edx, dword ptr [ebp + 0xc]
            //   7d25                 | jge                 0x27
            //   803800               | cmp                 byte ptr [eax], 0
            //   7430                 | je                  0x32
            //   89c2                 | mov                 edx, eax
            //   6690                 | nop                 

        $sequence_4 = { 8b30 01fe 8b06 85c0 }
            // n = 4, score = 100
            //   8b30                 | mov                 esi, dword ptr [eax]
            //   01fe                 | add                 esi, edi
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax

        $sequence_5 = { 7465 8d5803 c785c8f3ffff00000000 e9???????? ff15???????? }
            // n = 5, score = 100
            //   7465                 | je                  0x67
            //   8d5803               | lea                 ebx, [eax + 3]
            //   c785c8f3ffff00000000     | mov    dword ptr [ebp - 0xc38], 0
            //   e9????????           |                     
            //   ff15????????         |                     

        $sequence_6 = { ff15???????? 83ec08 a3???????? 85c0 0f84070b0000 c7442404???????? 891c24 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   83ec08               | sub                 esp, 8
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84070b0000         | je                  0xb0d
            //   c7442404????????     |                     
            //   891c24               | mov                 dword ptr [esp], ebx

        $sequence_7 = { 891c24 ff15???????? 83ec08 a3???????? 85c0 0f8466070000 c7442404???????? }
            // n = 7, score = 100
            //   891c24               | mov                 dword ptr [esp], ebx
            //   ff15????????         |                     
            //   83ec08               | sub                 esp, 8
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8466070000         | je                  0x76c
            //   c7442404????????     |                     

        $sequence_8 = { 83ec08 a3???????? 85c0 0f8467090000 }
            // n = 4, score = 100
            //   83ec08               | sub                 esp, 8
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8467090000         | je                  0x96d

        $sequence_9 = { c744240800400000 895c2404 893c24 ff15???????? 83ec0c c744240c00400000 }
            // n = 6, score = 100
            //   c744240800400000     | mov                 dword ptr [esp + 8], 0x4000
            //   895c2404             | mov                 dword ptr [esp + 4], ebx
            //   893c24               | mov                 dword ptr [esp], edi
            //   ff15????????         |                     
            //   83ec0c               | sub                 esp, 0xc
            //   c744240c00400000     | mov                 dword ptr [esp + 0xc], 0x4000

    condition:
        7 of them and filesize < 212992
}