rule win_swen_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.swen."
        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.swen"
        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 = { 891d???????? e9???????? 6810270000 e8???????? 59 85c0 74e6 }
            // n = 7, score = 100
            //   891d????????         |                     
            //   e9????????           |                     
            //   6810270000           | push                0x2710
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   74e6                 | je                  0xffffffe8

        $sequence_1 = { bb???????? 837ddc02 7362 897de4 837de400 7454 }
            // n = 6, score = 100
            //   bb????????           |                     
            //   837ddc02             | cmp                 dword ptr [ebp - 0x24], 2
            //   7362                 | jae                 0x64
            //   897de4               | mov                 dword ptr [ebp - 0x1c], edi
            //   837de400             | cmp                 dword ptr [ebp - 0x1c], 0
            //   7454                 | je                  0x56

        $sequence_2 = { bb02010000 68???????? 8bce e8???????? 68581b0000 }
            // n = 5, score = 100
            //   bb02010000           | mov                 ebx, 0x102
            //   68????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   68581b0000           | push                0x1b58

        $sequence_3 = { e8???????? 6a04 ff75dc 8d45e4 50 e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   6a04                 | push                4
            //   ff75dc               | push                dword ptr [ebp - 0x24]
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 85c3 7445 8d4741 8885d8feffff }
            // n = 4, score = 100
            //   85c3                 | test                ebx, eax
            //   7445                 | je                  0x47
            //   8d4741               | lea                 eax, [edi + 0x41]
            //   8885d8feffff         | mov                 byte ptr [ebp - 0x128], al

        $sequence_5 = { e8???????? 85c0 0f84b3000000 8d45b0 50 8d45ac 50 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84b3000000         | je                  0xb9
            //   8d45b0               | lea                 eax, [ebp - 0x50]
            //   50                   | push                eax
            //   8d45ac               | lea                 eax, [ebp - 0x54]
            //   50                   | push                eax

        $sequence_6 = { f682a1ac410004 7403 40 ff01 ff01 40 e9???????? }
            // n = 7, score = 100
            //   f682a1ac410004       | test                byte ptr [edx + 0x41aca1], 4
            //   7403                 | je                  5
            //   40                   | inc                 eax
            //   ff01                 | inc                 dword ptr [ecx]
            //   ff01                 | inc                 dword ptr [ecx]
            //   40                   | inc                 eax
            //   e9????????           |                     

        $sequence_7 = { ff05???????? 8345e402 6a03 56 ff75e4 e8???????? }
            // n = 6, score = 100
            //   ff05????????         |                     
            //   8345e402             | add                 dword ptr [ebp - 0x1c], 2
            //   6a03                 | push                3
            //   56                   | push                esi
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   e8????????           |                     

        $sequence_8 = { 8d8590fbffff 50 8d8514ffffff 50 ff15???????? 8d855cfdffff 50 }
            // n = 7, score = 100
            //   8d8590fbffff         | lea                 eax, [ebp - 0x470]
            //   50                   | push                eax
            //   8d8514ffffff         | lea                 eax, [ebp - 0xec]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d855cfdffff         | lea                 eax, [ebp - 0x2a4]
            //   50                   | push                eax

        $sequence_9 = { ff7508 ff15???????? 881c37 8d85d8fdffff 50 57 e8???????? }
            // n = 7, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   881c37               | mov                 byte ptr [edi + esi], bl
            //   8d85d8fdffff         | lea                 eax, [ebp - 0x228]
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 286720
}