rule win_venon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.venon."
        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.venon"
        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 = { f30f100d???????? f30fc2c801 f30f2cd0 f30fc205????????01 0f54c1 660f7ec0 4883c428 }
            // n = 7, score = 100
            //   f30f100d????????     |                     
            //   f30fc2c801           | dec                 eax
            //   f30f2cd0             | mov                 ecx, dword ptr [esi + 0x20]
            //   f30fc205????????01     |     
            //   0f54c1               | dec                 eax
            //   660f7ec0             | test                ecx, ecx
            //   4883c428             | je                  0x85a

        $sequence_1 = { fe0406 4d89e8 4929c8 0f8242010000 4801f1 b230 e8???????? }
            // n = 7, score = 100
            //   fe0406               | dec                 eax
            //   4d89e8               | mov                 dword ptr [eax + 8], ecx
            //   4929c8               | jmp                 0x29d
            //   0f8242010000         | dec                 eax
            //   4801f1               | mov                 eax, dword ptr [esp + 0x70]
            //   b230                 | dec                 eax
            //   e8????????           |                     

        $sequence_2 = { ffc5 71da 488d0dbd133100 e8???????? 83f82e 7442 83f845 }
            // n = 7, score = 100
            //   ffc5                 | test                al, 1
            //   71da                 | je                  0x317
            //   488d0dbd133100       | dec                 eax
            //   e8????????           |                     
            //   83f82e               | add                 edx, eax
            //   7442                 | dec                 eax
            //   83f845               | lea                 ecx, [esp + 0x28]

        $sequence_3 = { ebe2 c685d703000000 e8???????? 4885c0 0f84af010000 4883a55001000000 488d15e0e67000 }
            // n = 7, score = 100
            //   ebe2                 | dec                 eax
            //   c685d703000000       | lea                 ecx, [0x621b3f]
            //   e8????????           |                     
            //   4885c0               | dec                 eax
            //   0f84af010000         | lea                 ecx, [0x621b4b]
            //   4883a55001000000     | dec                 eax
            //   488d15e0e67000       | lea                 ecx, [0x533633]

        $sequence_4 = { f30f113c10 0fb7ce 488b8328400000 66412bcc 664103cb 6641890c00 4103f3 }
            // n = 7, score = 100
            //   f30f113c10           | cmp                 al, 0xff
            //   0fb7ce               | dec                 eax
            //   488b8328400000       | mov                 dword ptr [ebp + 0x58], eax
            //   66412bcc             | mov                 byte ptr [ebp - 1], 0
            //   664103cb             | push                8
            //   6641890c00           | inc                 ecx
            //   4103f3               | pop                 edi

        $sequence_5 = { eb17 488b06 488b08 41b801000000 4c89f2 e8???????? 4889c1 }
            // n = 7, score = 100
            //   eb17                 | sar                 eax, 1
            //   488b06               | mov                 dword ptr [esp + 0x40], eax
            //   488b08               | mov                 dword ptr [esp + 0x30], 0xffffffff
            //   41b801000000         | dec                 eax
            //   4c89f2               | mov                 eax, dword ptr [esp + 0x38]
            //   e8????????           |                     
            //   4889c1               | movzx               eax, byte ptr [eax + 0x608]

        $sequence_6 = { e8???????? eb8c 498b4608 4889453f 410f1046f9 0f294530 488d4537 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb8c                 | mov                 dword ptr [edx], eax
            //   498b4608             | dec                 eax
            //   4889453f             | mov                 ecx, dword ptr [edx]
            //   410f1046f9           | mov                 dword ptr [edx], 0xc4cbe0e
            //   0f294530             | dec                 esp
            //   488d4537             | lea                 esi, [ebp + 0x10]

        $sequence_7 = { f2440f2cf5 440f4af0 f20f5ec4 f20f2ae3 f20f59e0 660f2ee4 f20f5fe2 }
            // n = 7, score = 100
            //   f2440f2cf5           | add                 esi, 0x10
            //   440f4af0             | dec                 esp
            //   f20f5ec4             | mov                 edi, dword ptr [ebx]
            //   f20f2ae3             | dec                 esp
            //   f20f59e0             | mov                 eax, edi
            //   660f2ee4             | cmp                 eax, 0xf
            //   f20f5fe2             | dec                 eax

        $sequence_8 = { ffc7 0f28f8 f20f58fe 83ff07 7c96 ffc3 83fb07 }
            // n = 7, score = 100
            //   ffc7                 | pop                 edi
            //   0f28f8               | pop                 esi
            //   f20f58fe             | inc                 ecx
            //   83ff07               | pop                 esi
            //   7c96                 | ret                 
            //   ffc3                 | jmp                 0x1c
            //   83fb07               | dec                 eax

        $sequence_9 = { ff5008 488b442450 8b4c2420 89885c010000 488b442438 488b4c2428 488908 }
            // n = 7, score = 100
            //   ff5008               | mov                 ecx, dword ptr [ebp + 0x568]
            //   488b442450           | movups              xmmword ptr [ecx + 8], xmm0
            //   8b4c2420             | dec                 eax
            //   89885c010000         | mov                 eax, 2
            //   488b442438           | add                 byte ptr [eax], al
            //   488b4c2428           | add                 byte ptr [eax - 0x774a74b8], al
            //   488908               | add                 eax, 0x60eb0000

    condition:
        7 of them and filesize < 19539968
}