rule win_obscene_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.obscene."
        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.obscene"
        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 = { 754e ff750c e8???????? 59 3da0bb0d00 733e }
            // n = 6, score = 100
            //   754e                 | jne                 0x50
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   3da0bb0d00           | cmp                 eax, 0xdbba0
            //   733e                 | jae                 0x40

        $sequence_1 = { 0fbe00 83f87a 7e1f 8b45f8 0fbe00 83f85f }
            // n = 6, score = 100
            //   0fbe00               | movsx               eax, byte ptr [eax]
            //   83f87a               | cmp                 eax, 0x7a
            //   7e1f                 | jle                 0x21
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   0fbe00               | movsx               eax, byte ptr [eax]
            //   83f85f               | cmp                 eax, 0x5f

        $sequence_2 = { 8b400c 83e010 85c0 754e }
            // n = 4, score = 100
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   83e010               | and                 eax, 0x10
            //   85c0                 | test                eax, eax
            //   754e                 | jne                 0x50

        $sequence_3 = { 50 68ff000000 ff15???????? 8d8500ffffff 50 68d83f1010 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   68ff000000           | push                0xff
            //   ff15????????         |                     
            //   8d8500ffffff         | lea                 eax, [ebp - 0x100]
            //   50                   | push                eax
            //   68d83f1010           | push                0x10103fd8

        $sequence_4 = { 55 8bec 51 ff7510 ff750c ff15???????? }
            // n = 6, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff15????????         |                     

        $sequence_5 = { ff15???????? 68???????? ff75f8 ff15???????? a3???????? 8d45fc 50 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   68????????           |                     
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   a3????????           |                     
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax

        $sequence_6 = { ff750c e8???????? 59 3da0bb0d00 733e ff75fc }
            // n = 6, score = 100
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   3da0bb0d00           | cmp                 eax, 0xdbba0
            //   733e                 | jae                 0x40
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_7 = { 59 ff7508 6860ad0010 e8???????? 59 59 68bc501010 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   6860ad0010           | push                0x1000ad60
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   68bc501010           | push                0x101050bc

        $sequence_8 = { 59 ffb5eef7ffff ff15???????? 0fb7c0 83f850 751a ff7510 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   ffb5eef7ffff         | push                dword ptr [ebp - 0x812]
            //   ff15????????         |                     
            //   0fb7c0               | movzx               eax, ax
            //   83f850               | cmp                 eax, 0x50
            //   751a                 | jne                 0x1c
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_9 = { 83f839 7e6c 8b4508 0fbe00 83f841 }
            // n = 5, score = 100
            //   83f839               | cmp                 eax, 0x39
            //   7e6c                 | jle                 0x6e
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0fbe00               | movsx               eax, byte ptr [eax]
            //   83f841               | cmp                 eax, 0x41

    condition:
        7 of them and filesize < 2170880
}