SYMBOLCOMMON_NAMEaka. SYNONYMS
win.rincux (Back to overview)

Rincux


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References
2011Virus BulletinJeff Edwards, Jose Nazario
@techreport{edwards:2011:survey:e95ca12, author = {Jeff Edwards and Jose Nazario}, title = {{A Survey of Contemporary Chinese DDoS Malware}}, date = {2011}, institution = {Virus Bulletin}, url = {https://www.virusbulletin.com/uploads/pdf/conference_slides/2011/Edwards-Nazario-VB2011.pdf}, language = {English}, urldate = {2020-01-06} } A Survey of Contemporary Chinese DDoS Malware
Rincux
Yara Rules
[TLP:WHITE] win_rincux_auto (20220411 | Detects win.rincux.)
rule win_rincux_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.rincux."
        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.rincux"
        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 = { 51 ff15???????? 83c438 a3???????? 5b 68???????? ff15???????? }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   83c438               | add                 esp, 0x38
            //   a3????????           |                     
            //   5b                   | pop                 ebx
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_1 = { c685c4fdffff6e c685c5fdffff74 c685c6fdffff72 c685c7fdffff6f c685c8fdffff6c c685c9fdffff53 }
            // n = 6, score = 200
            //   c685c4fdffff6e       | mov                 byte ptr [ebp - 0x23c], 0x6e
            //   c685c5fdffff74       | mov                 byte ptr [ebp - 0x23b], 0x74
            //   c685c6fdffff72       | mov                 byte ptr [ebp - 0x23a], 0x72
            //   c685c7fdffff6f       | mov                 byte ptr [ebp - 0x239], 0x6f
            //   c685c8fdffff6c       | mov                 byte ptr [ebp - 0x238], 0x6c
            //   c685c9fdffff53       | mov                 byte ptr [ebp - 0x237], 0x53

        $sequence_2 = { 8bce e8???????? 6a00 8bce 8bf0 e8???????? 8b55ec }
            // n = 7, score = 200
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   6a00                 | push                0
            //   8bce                 | mov                 ecx, esi
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]

        $sequence_3 = { 8b8c2498000000 56 8984248c000000 e8???????? 8984248c000000 8a44241b 33f6 }
            // n = 7, score = 200
            //   8b8c2498000000       | mov                 ecx, dword ptr [esp + 0x98]
            //   56                   | push                esi
            //   8984248c000000       | mov                 dword ptr [esp + 0x8c], eax
            //   e8????????           |                     
            //   8984248c000000       | mov                 dword ptr [esp + 0x8c], eax
            //   8a44241b             | mov                 al, byte ptr [esp + 0x1b]
            //   33f6                 | xor                 esi, esi

        $sequence_4 = { 8be8 e8???????? 53 89442428 e8???????? }
            // n = 5, score = 200
            //   8be8                 | mov                 ebp, eax
            //   e8????????           |                     
            //   53                   | push                ebx
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   e8????????           |                     

        $sequence_5 = { f3a5 ff15???????? 50 53 8bcd e8???????? 53 }
            // n = 7, score = 200
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff15????????         |                     
            //   50                   | push                eax
            //   53                   | push                ebx
            //   8bcd                 | mov                 ecx, ebp
            //   e8????????           |                     
            //   53                   | push                ebx

        $sequence_6 = { 6a00 8b88a8000000 51 68???????? eb15 8b4304 6a00 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   8b88a8000000         | mov                 ecx, dword ptr [eax + 0xa8]
            //   51                   | push                ecx
            //   68????????           |                     
            //   eb15                 | jmp                 0x17
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   6a00                 | push                0

        $sequence_7 = { 8b3d???????? 83f8ff 7576 8d542418 8d442468 52 }
            // n = 6, score = 200
            //   8b3d????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   7576                 | jne                 0x78
            //   8d542418             | lea                 edx, dword ptr [esp + 0x18]
            //   8d442468             | lea                 eax, dword ptr [esp + 0x68]
            //   52                   | push                edx

        $sequence_8 = { 6804010000 51 88442414 c644240c70 ff15???????? 8d5624 }
            // n = 6, score = 200
            //   6804010000           | push                0x104
            //   51                   | push                ecx
            //   88442414             | mov                 byte ptr [esp + 0x14], al
            //   c644240c70           | mov                 byte ptr [esp + 0xc], 0x70
            //   ff15????????         |                     
            //   8d5624               | lea                 edx, dword ptr [esi + 0x24]

        $sequence_9 = { ff15???????? 8b3d???????? 83f8ff 7576 8d542418 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   8b3d????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   7576                 | jne                 0x78
            //   8d542418             | lea                 edx, dword ptr [esp + 0x18]

    condition:
        7 of them and filesize < 392192
}
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