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 (20230125 | Detects win.rincux.)
rule win_rincux_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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???????? 83c410 83bde8fdffff02 7524 8b85ecfdffff 8b8df0fdffff 8b95e4fdffff }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   83bde8fdffff02       | cmp                 dword ptr [ebp - 0x218], 2
            //   7524                 | jne                 0x26
            //   8b85ecfdffff         | mov                 eax, dword ptr [ebp - 0x214]
            //   8b8df0fdffff         | mov                 ecx, dword ptr [ebp - 0x210]
            //   8b95e4fdffff         | mov                 edx, dword ptr [ebp - 0x21c]

        $sequence_1 = { b82000cc00 85d2 7405 b82000cc40 83c110 50 51 }
            // n = 7, score = 200
            //   b82000cc00           | mov                 eax, 0xcc0020
            //   85d2                 | test                edx, edx
            //   7405                 | je                  7
            //   b82000cc40           | mov                 eax, 0x40cc0020
            //   83c110               | add                 ecx, 0x10
            //   50                   | push                eax
            //   51                   | push                ecx

        $sequence_2 = { 46 83fd20 89442410 89742414 72d2 8bd0 }
            // n = 6, score = 200
            //   46                   | inc                 esi
            //   83fd20               | cmp                 ebp, 0x20
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   89742414             | mov                 dword ptr [esp + 0x14], esi
            //   72d2                 | jb                  0xffffffd4
            //   8bd0                 | mov                 edx, eax

        $sequence_3 = { 8b8684000000 8b542418 52 56 8d0c40 ff148da0fe0110 }
            // n = 6, score = 200
            //   8b8684000000         | mov                 eax, dword ptr [esi + 0x84]
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   52                   | push                edx
            //   56                   | push                esi
            //   8d0c40               | lea                 ecx, [eax + eax*2]
            //   ff148da0fe0110       | call                dword ptr [ecx*4 + 0x1001fea0]

        $sequence_4 = { 89742414 897c2418 0f85c6060000 c783c41b0000ffffffff e9???????? 8b4b54 b801000000 }
            // n = 7, score = 200
            //   89742414             | mov                 dword ptr [esp + 0x14], esi
            //   897c2418             | mov                 dword ptr [esp + 0x18], edi
            //   0f85c6060000         | jne                 0x6cc
            //   c783c41b0000ffffffff     | mov    dword ptr [ebx + 0x1bc4], 0xffffffff
            //   e9????????           |                     
            //   8b4b54               | mov                 ecx, dword ptr [ebx + 0x54]
            //   b801000000           | mov                 eax, 1

        $sequence_5 = { 8bd8 8b442418 51 52 53 8d8c24d8010000 50 }
            // n = 7, score = 200
            //   8bd8                 | mov                 ebx, eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   53                   | push                ebx
            //   8d8c24d8010000       | lea                 ecx, [esp + 0x1d8]
            //   50                   | push                eax

        $sequence_6 = { 83c8ff 8b8c2474010000 64890d00000000 81c480010000 c20400 }
            // n = 5, score = 200
            //   83c8ff               | or                  eax, 0xffffffff
            //   8b8c2474010000       | mov                 ecx, dword ptr [esp + 0x174]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   81c480010000         | add                 esp, 0x180
            //   c20400               | ret                 4

        $sequence_7 = { 66c744240c0100 66c744240e0500 66c74424100200 66c74424180800 66c744241a0700 8bc1 742a }
            // n = 7, score = 200
            //   66c744240c0100       | mov                 word ptr [esp + 0xc], 1
            //   66c744240e0500       | mov                 word ptr [esp + 0xe], 5
            //   66c74424100200       | mov                 word ptr [esp + 0x10], 2
            //   66c74424180800       | mov                 word ptr [esp + 0x18], 8
            //   66c744241a0700       | mov                 word ptr [esp + 0x1a], 7
            //   8bc1                 | mov                 eax, ecx
            //   742a                 | je                  0x2c

        $sequence_8 = { 32c0 5e 83c41c c3 b165 b072 884c2415 }
            // n = 7, score = 200
            //   32c0                 | xor                 al, al
            //   5e                   | pop                 esi
            //   83c41c               | add                 esp, 0x1c
            //   c3                   | ret                 
            //   b165                 | mov                 cl, 0x65
            //   b072                 | mov                 al, 0x72
            //   884c2415             | mov                 byte ptr [esp + 0x15], cl

        $sequence_9 = { 85c9 0f8482000000 8b5320 85d2 7446 8b4210 85c0 }
            // n = 7, score = 200
            //   85c9                 | test                ecx, ecx
            //   0f8482000000         | je                  0x88
            //   8b5320               | mov                 edx, dword ptr [ebx + 0x20]
            //   85d2                 | test                edx, edx
            //   7446                 | je                  0x48
            //   8b4210               | mov                 eax, dword ptr [edx + 0x10]
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 392192
}
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