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สำนักงานพัฒนาธุรกรรมทางอิเล็กทรอนิกส์ Electronic Transactions Development Agency |
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สำนักงานพัฒนาธุรกรรมทางอิเล็กทรอนิกส์ Electronic Transactions Development Agency |
Tool: Cotx RAT| Names | Cotx RAT | |
| Category | Malware | |
| Type | Reconnaissance, Backdoor, Credential stealer | |
| Description | (Proofpoint) The RasTls.dll contains the Cotx RAT code. The malware is written in C++ using object-oriented programming. We named it by borrowing the name of the location of its stored configuration. The encrypted configuration is stored in the side-loaded DLL file RasTls.dll in a PE section named “.cotx”. The current encrypted configuration is also stored in the registry key “HKEY_LOCAL_MACHINE\SOFTWARE\Intel\Java\user”. The command and control structure of Cotx RAT is proxy aware. It utilizes wolfSSL for TLS encrypted communication. The initial beacon contains “|”-delimited system information. The data included in the beacon is Zlib compressed and encrypted with AES-192 in CBC mode utilizing the same keys as the configuration. The following values are included: • 'id' value from 'software\\intel\\java' subkey • Computer name • 'mark' field from configuration • Username • Windows version • Architecture • Possible malware version. '0.9.7' is hardcoded in the analyzed sample • Local IP addresses • First adapter's MAC address • Connection type (https or _proxy) • 'password' field from configuration | |
| Information | <https://www.proofpoint.com/us/threat-insight/post/chinese-apt-operation-lagtime-it-targets-government-information-technology> | |
| Malpedia | <https://malpedia.caad.fkie.fraunhofer.de/details/win.cotx> | |
Last change to this tool card: 24 April 2021
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| Changed | Name | Country | Observed | ||
APT groups | |||||
| TA428 |  | 2013-Jan 2022 | |||
1 group listed (1 APT, 0 other, 0 unknown)
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