SYMBOLCOMMON_NAMEaka. SYNONYMS
win.cotx (Back to overview)

Cotx RAT


There is no description at this point.

References
2020-01-29nao_sec blognao_sec
@online{naosec:20200129:overhead:ec0aeb5, author = {nao_sec}, title = {{An Overhead View of the Royal Road}}, date = {2020-01-29}, organization = {nao_sec blog}, url = {https://nao-sec.org/2020/01/an-overhead-view-of-the-royal-road.html}, language = {English}, urldate = {2020-02-03} } An Overhead View of the Royal Road
BLACKCOFFEE Cotx RAT Datper DDKONG Derusbi Icefog Korlia NewCore RAT PLAINTEE Poison Ivy Sisfader
2019-07-23ProofpointMichael Raggi, Dennis Schwarz, Proofpoint Threat Insight Team
@online{raggi:20190723:chinese:804ec1c, author = {Michael Raggi and Dennis Schwarz and Proofpoint Threat Insight Team}, title = {{Chinese APT “Operation LagTime IT” Targets Government Information Technology Agencies in Eastern Asia}}, date = {2019-07-23}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/chinese-apt-operation-lagtime-it-targets-government-information-technology}, language = {English}, urldate = {2019-12-20} } Chinese APT “Operation LagTime IT” Targets Government Information Technology Agencies in Eastern Asia
8.t Dropper Cotx RAT TA428
Yara Rules
[TLP:WHITE] win_cotx_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_cotx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cotx"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 83e103 f3a4 8d8d98f6ffff e8???????? 53 ff15???????? }
            // n = 6, score = 300
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8d8d98f6ffff         | lea                 ecx, [ebp - 0x968]
            //   e8????????           |                     
            //   53                   | push                ebx
            //   ff15????????         |                     

        $sequence_1 = { 50 51 8d85bcebffff 50 56 ff15???????? 56 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8d85bcebffff         | lea                 eax, [ebp - 0x1444]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_2 = { 50 8d45a0 68???????? 50 e8???????? 8d55a0 83c420 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   8d45a0               | lea                 eax, [ebp - 0x60]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d55a0               | lea                 edx, [ebp - 0x60]
            //   83c420               | add                 esp, 0x20

        $sequence_3 = { 8bf0 ff75fc 56 e8???????? }
            // n = 4, score = 300
            //   8bf0                 | mov                 esi, eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_4 = { ff15???????? 8d85bcf3ffff 6a2e 50 }
            // n = 4, score = 300
            //   ff15????????         |                     
            //   8d85bcf3ffff         | lea                 eax, [ebp - 0xc44]
            //   6a2e                 | push                0x2e
            //   50                   | push                eax

        $sequence_5 = { 8b4df4 897704 0fb74316 c1e80d 83e001 894714 0fb74316 }
            // n = 7, score = 300
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   897704               | mov                 dword ptr [edi + 4], esi
            //   0fb74316             | movzx               eax, word ptr [ebx + 0x16]
            //   c1e80d               | shr                 eax, 0xd
            //   83e001               | and                 eax, 1
            //   894714               | mov                 dword ptr [edi + 0x14], eax
            //   0fb74316             | movzx               eax, word ptr [ebx + 0x16]

        $sequence_6 = { 8d45fc 50 8b8574fdffff 83c008 50 ff75ec ff15???????? }
            // n = 7, score = 300
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   8b8574fdffff         | mov                 eax, dword ptr [ebp - 0x28c]
            //   83c008               | add                 eax, 8
            //   50                   | push                eax
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   ff15????????         |                     

        $sequence_7 = { 83c40c 0f1145b0 56 50 8d85b0fbffff }
            // n = 5, score = 300
            //   83c40c               | add                 esp, 0xc
            //   0f1145b0             | movups              xmmword ptr [ebp - 0x50], xmm0
            //   56                   | push                esi
            //   50                   | push                eax
            //   8d85b0fbffff         | lea                 eax, [ebp - 0x450]

        $sequence_8 = { 8bca c685bcfaffff2d 68db030000 83e103 0f118598faffff 6a00 }
            // n = 6, score = 300
            //   8bca                 | mov                 ecx, edx
            //   c685bcfaffff2d       | mov                 byte ptr [ebp - 0x544], 0x2d
            //   68db030000           | push                0x3db
            //   83e103               | and                 ecx, 3
            //   0f118598faffff       | movups              xmmword ptr [ebp - 0x568], xmm0
            //   6a00                 | push                0

        $sequence_9 = { c785b8faffff39313044 c1e902 f3a5 8bca }
            // n = 4, score = 300
            //   c785b8faffff39313044     | mov    dword ptr [ebp - 0x548], 0x44303139
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx

    condition:
        7 of them and filesize < 1171456
}
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