rule win_maoloa_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.maoloa."
        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.maoloa"
        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 = { 7539 68???????? ff36 e8???????? 83c408 85c0 7526 }
            // n = 7, score = 100
            //   7539                 | jne                 0x3b
            //   68????????           |                     
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7526                 | jne                 0x28

        $sequence_1 = { 90 ff0f 8d4dd8 33d2 e8???????? 8bf0 85f6 }
            // n = 7, score = 100
            //   90                   | nop                 
            //   ff0f                 | dec                 dword ptr [edi]
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   33d2                 | xor                 edx, edx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi

        $sequence_2 = { eb2a 8b7de8 eb1d 56 8bd3 8d4de8 e8???????? }
            // n = 7, score = 100
            //   eb2a                 | jmp                 0x2c
            //   8b7de8               | mov                 edi, dword ptr [ebp - 0x18]
            //   eb1d                 | jmp                 0x1f
            //   56                   | push                esi
            //   8bd3                 | mov                 edx, ebx
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   e8????????           |                     

        $sequence_3 = { c1fb05 33c3 33856cffffff 8901 0f31 89857cffffff }
            // n = 6, score = 100
            //   c1fb05               | sar                 ebx, 5
            //   33c3                 | xor                 eax, ebx
            //   33856cffffff         | xor                 eax, dword ptr [ebp - 0x94]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   0f31                 | rdtsc               
            //   89857cffffff         | mov                 dword ptr [ebp - 0x84], eax

        $sequence_4 = { 8d85dcfbffff 8bcf 50 ffb5d0fbffff ffb5c8fbffff e8???????? }
            // n = 6, score = 100
            //   8d85dcfbffff         | lea                 eax, [ebp - 0x424]
            //   8bcf                 | mov                 ecx, edi
            //   50                   | push                eax
            //   ffb5d0fbffff         | push                dword ptr [ebp - 0x430]
            //   ffb5c8fbffff         | push                dword ptr [ebp - 0x438]
            //   e8????????           |                     

        $sequence_5 = { 8d4df4 e8???????? 8bf0 83c404 85f6 757e 85db }
            // n = 7, score = 100
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c404               | add                 esp, 4
            //   85f6                 | test                esi, esi
            //   757e                 | jne                 0x80
            //   85db                 | test                ebx, ebx

        $sequence_6 = { c1e308 0fb68998f14200 33d9 8b4dfc 0fb6c9 c1e308 0fb68998f14200 }
            // n = 7, score = 100
            //   c1e308               | shl                 ebx, 8
            //   0fb68998f14200       | movzx               ecx, byte ptr [ecx + 0x42f198]
            //   33d9                 | xor                 ebx, ecx
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   0fb6c9               | movzx               ecx, cl
            //   c1e308               | shl                 ebx, 8
            //   0fb68998f14200       | movzx               ecx, byte ptr [ecx + 0x42f198]

        $sequence_7 = { 50 e8???????? 8d4710 c7471400000000 c70000000000 83c40c 8985dcdfffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4710               | lea                 eax, [edi + 0x10]
            //   c7471400000000       | mov                 dword ptr [edi + 0x14], 0
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   83c40c               | add                 esp, 0xc
            //   8985dcdfffff         | mov                 dword ptr [ebp - 0x2024], eax

        $sequence_8 = { 40 40 eb21 8b45b0 40 40 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   40                   | inc                 eax
            //   eb21                 | jmp                 0x23
            //   8b45b0               | mov                 eax, dword ptr [ebp - 0x50]
            //   40                   | inc                 eax
            //   40                   | inc                 eax

        $sequence_9 = { 8d75dc bb10000000 2bd9 8d4830 8bc7 2bc6 }
            // n = 6, score = 100
            //   8d75dc               | lea                 esi, [ebp - 0x24]
            //   bb10000000           | mov                 ebx, 0x10
            //   2bd9                 | sub                 ebx, ecx
            //   8d4830               | lea                 ecx, [eax + 0x30]
            //   8bc7                 | mov                 eax, edi
            //   2bc6                 | sub                 eax, esi

    condition:
        7 of them and filesize < 586752
}