rule win_swen_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 81c6d0750000 56 ff15???????? ff35???????? ff15???????? 5e }
            // n = 6, score = 100
            //   81c6d0750000         | add                 esi, 0x75d0
            //   56                   | push                esi
            //   ff15????????         |                     
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   5e                   | pop                 esi

        $sequence_1 = { 56 6a03 bf000000c0 57 68???????? 8d850cffffff 50 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   6a03                 | push                3
            //   bf000000c0           | mov                 edi, 0xc0000000
            //   57                   | push                edi
            //   68????????           |                     
            //   8d850cffffff         | lea                 eax, [ebp - 0xf4]
            //   50                   | push                eax

        $sequence_2 = { 50 57 e8???????? 6a71 57 e8???????? be???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   6a71                 | push                0x71
            //   57                   | push                edi
            //   e8????????           |                     
            //   be????????           |                     

        $sequence_3 = { 894dcc 3bcb 0f8415ffffff 8bc1 2b45e4 8945e0 }
            // n = 6, score = 100
            //   894dcc               | mov                 dword ptr [ebp - 0x34], ecx
            //   3bcb                 | cmp                 ecx, ebx
            //   0f8415ffffff         | je                  0xffffff1b
            //   8bc1                 | mov                 eax, ecx
            //   2b45e4               | sub                 eax, dword ptr [ebp - 0x1c]
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax

        $sequence_4 = { 0f8452020000 6a04 8d85448affff 50 8bce e8???????? }
            // n = 6, score = 100
            //   0f8452020000         | je                  0x258
            //   6a04                 | push                4
            //   8d85448affff         | lea                 eax, [ebp - 0x75bc]
            //   50                   | push                eax
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_5 = { 6a10 68???????? 50 6a00 ff15???????? 68b0040000 ff15???????? }
            // n = 7, score = 100
            //   6a10                 | push                0x10
            //   68????????           |                     
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   68b0040000           | push                0x4b0
            //   ff15????????         |                     

        $sequence_6 = { 3bc6 7403 802000 57 e8???????? 59 8945e4 }
            // n = 7, score = 100
            //   3bc6                 | cmp                 eax, esi
            //   7403                 | je                  5
            //   802000               | and                 byte ptr [eax], 0
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_7 = { 50 50 ff15???????? 898578ffffff 3bc3 740b 53 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   50                   | push                eax
            //   ff15????????         |                     
            //   898578ffffff         | mov                 dword ptr [ebp - 0x88], eax
            //   3bc3                 | cmp                 eax, ebx
            //   740b                 | je                  0xd
            //   53                   | push                ebx

        $sequence_8 = { 7415 6a21 6814040000 ff7510 ff36 e8???????? 3bc3 }
            // n = 7, score = 100
            //   7415                 | je                  0x17
            //   6a21                 | push                0x21
            //   6814040000           | push                0x414
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   3bc3                 | cmp                 eax, ebx

        $sequence_9 = { 59 6a25 e8???????? 59 85c0 7407 68???????? }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   6a25                 | push                0x25
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   68????????           |                     

    condition:
        7 of them and filesize < 286720
}