SYMBOLCOMMON_NAMEaka. SYNONYMS
win.swen (Back to overview)

swen


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References
2019-11-07WikipediaVarious
@online{various:20191107:swen:265eb13, author = {Various}, title = {{Swen (computer worm)}}, date = {2019-11-07}, organization = {Wikipedia}, url = {https://en.wikipedia.org/wiki/Swen_(computer_worm)}, language = {English}, urldate = {2020-01-13} } Swen (computer worm)
swen
Yara Rules
[TLP:WHITE] win_swen_auto (20220411 | Detects win.swen.)
rule win_swen_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 89bddcfeffff 8b7508 56 e8???????? 59 85c0 7477 }
            // n = 7, score = 100
            //   89bddcfeffff         | mov                 dword ptr [ebp - 0x124], edi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7477                 | je                  0x79

        $sequence_1 = { 899d74ffffff 895dfc b8???????? 50 50 ff15???????? }
            // n = 6, score = 100
            //   899d74ffffff         | mov                 dword ptr [ebp - 0x8c], ebx
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   b8????????           |                     
            //   50                   | push                eax
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 68???????? 57 e8???????? 8975e0 8d45e0 50 }
            // n = 6, score = 100
            //   68????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8d45e0               | lea                 eax, dword ptr [ebp - 0x20]
            //   50                   | push                eax

        $sequence_3 = { 50 57 e8???????? 68???????? 57 e8???????? 8d45bc }
            // n = 7, score = 100
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   68????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   8d45bc               | lea                 eax, dword ptr [ebp - 0x44]

        $sequence_4 = { 68???????? eb7c 57 e8???????? 59 48 741e }
            // n = 7, score = 100
            //   68????????           |                     
            //   eb7c                 | jmp                 0x7e
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   48                   | dec                 eax
            //   741e                 | je                  0x20

        $sequence_5 = { 8d8510ffffff 50 68???????? 8d4580 50 ff15???????? 83c40c }
            // n = 7, score = 100
            //   8d8510ffffff         | lea                 eax, dword ptr [ebp - 0xf0]
            //   50                   | push                eax
            //   68????????           |                     
            //   8d4580               | lea                 eax, dword ptr [ebp - 0x80]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_6 = { 50 be???????? 8bce e8???????? 6a01 8bce }
            // n = 6, score = 100
            //   50                   | push                eax
            //   be????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   6a01                 | push                1
            //   8bce                 | mov                 ecx, esi

        $sequence_7 = { 83c414 6a64 8d85bcfeffff 50 68f0030000 ff7508 ffd6 }
            // n = 7, score = 100
            //   83c414               | add                 esp, 0x14
            //   6a64                 | push                0x64
            //   8d85bcfeffff         | lea                 eax, dword ptr [ebp - 0x144]
            //   50                   | push                eax
            //   68f0030000           | push                0x3f0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd6                 | call                esi

        $sequence_8 = { e8???????? 83c410 53 ff15???????? 8945e4 83f8ff }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   83f8ff               | cmp                 eax, -1

        $sequence_9 = { 6802000080 ff15???????? 399d68ffffff 7507 33c0 e9???????? }
            // n = 6, score = 100
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   399d68ffffff         | cmp                 dword ptr [ebp - 0x98], ebx
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

    condition:
        7 of them and filesize < 286720
}
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