rule win_owlproxy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.owlproxy."
        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.owlproxy"
        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 = { e8???????? 4883632800 488d05f0850100 488903 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   4883632800           | lea                 esi, [0x12a4a]
            //   488d05f0850100       | inc                 ecx
            //   488903               | neg                 ebp

        $sequence_1 = { 7415 ba02000000 ff15???????? 488b4b08 ff15???????? }
            // n = 5, score = 200
            //   7415                 | dec                 eax
            //   ba02000000           | mov                 dword ptr [esp + 0x4b0], ebx
            //   ff15????????         |                     
            //   488b4b08             | dec                 eax
            //   ff15????????         |                     

        $sequence_2 = { 4883ec30 48c7442420feffffff 48895c2460 48896c2468 4d8be0 }
            // n = 5, score = 200
            //   4883ec30             | cmp                 edi, dword ptr [ebp + 0x48]
            //   48c7442420feffffff     | je    0x19a1
            //   48895c2460           | dec                 eax
            //   48896c2468           | mov                 ecx, dword ptr [ebx + 0x120]
            //   4d8be0               | dec                 eax

        $sequence_3 = { 488b442448 488903 488b442458 48894b18 48894310 488bc3 488b4c2468 }
            // n = 7, score = 200
            //   488b442448           | dec                 eax
            //   488903               | mov                 eax, edx
            //   488b442458           | dec                 eax
            //   48894b18             | or                  eax, ecx
            //   48894310             | and                 eax, 0xf
            //   488bc3               | dec                 esp
            //   488b4c2468           | lea                 ecx, [ebp - 0x50]

        $sequence_4 = { e8???????? eb03 c60701 488bc7 488b8dd0010000 4833cc }
            // n = 6, score = 200
            //   e8????????           |                     
            //   eb03                 | lea                 edx, [esp + 0x58]
            //   c60701               | dec                 eax
            //   488bc7               | mov                 ecx, dword ptr [esi + 8]
            //   488b8dd0010000       | dec                 eax
            //   4833cc               | mov                 ecx, dword ptr [esp + 0x30]

        $sequence_5 = { 488bc3 488b5c2430 4883c420 5f c3 488d0d7c200200 }
            // n = 6, score = 200
            //   488bc3               | dec                 eax
            //   488b5c2430           | mov                 eax, dword ptr [edi + 0x38]
            //   4883c420             | dec                 eax
            //   5f                   | mov                 dword ptr [esp + 0x28], eax
            //   c3                   | dec                 eax
            //   488d0d7c200200       | lea                 eax, [0x1361e]

        $sequence_6 = { 84c0 7410 498b4610 4839442450 7605 40b701 eb03 }
            // n = 7, score = 200
            //   84c0                 | nop                 word ptr [eax + eax]
            //   7410                 | inc                 ebp
            //   498b4610             | xor                 eax, eax
            //   4839442450           | mov                 word ptr [ecx], bp
            //   7605                 | dec                 eax
            //   40b701               | cmp                 dword ptr [edx + 0x18], 0x10
            //   eb03                 | dec                 eax

        $sequence_7 = { 488bd9 488d05ad570100 488981a0000000 83611000 c7411c01000000 c781c800000001000000 b843000000 }
            // n = 7, score = 200
            //   488bd9               | dec                 eax
            //   488d05ad570100       | lea                 edx, [0x1ae34]
            //   488981a0000000       | inc                 edi
            //   83611000             | dec                 edx
            //   c7411c01000000       | mov                 ecx, dword ptr [edx + ebp*8]
            //   c781c800000001000000     | jae    0x3f2
            //   b843000000           | dec                 eax

        $sequence_8 = { 488d1c32 4c8d0543130100 388c2498000000 0f94c1 }
            // n = 4, score = 200
            //   488d1c32             | dec                 eax
            //   4c8d0543130100       | mov                 dword ptr [ebp + 0xae0], eax
            //   388c2498000000       | dec                 esp
            //   0f94c1               | lea                 ecx, [ebp + 0x40]

        $sequence_9 = { e8???????? 488d4d70 4883bd8800000010 480f434d70 e8???????? }
            // n = 5, score = 200
            //   e8????????           |                     
            //   488d4d70             | dec                 eax
            //   4883bd8800000010     | lea                 ecx, [ebp - 0x29]
            //   480f434d70           | nop                 
            //   e8????????           |                     

    condition:
        7 of them and filesize < 475136
}