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Permanent link Tool: Gorynych

NamesGorynych
Diamond Fox
CategoryMalware
TypeBackdoor, Keylogger, Info stealer, Credential stealer, Botnet, Downloader, Exfiltration
Description(Trend Micro) There’s a new player in the card theft game that changes it altogether: Gorynych or the Diamond Fox botnet malware. BKDR_GORYNYCH may not technically be considered a PoS malware, as it is not entirely designed for PoS systems and is also being used outside of the Black Atlas operation. However, cybercriminals running Black Atlas have built a copy that can specifically look for the output file of the BlackPOS malware, which is the one that harvested the credit card data from the targets in the first place. The fact that the images in Gorynych’s control panel were named “Kartoxa,” which also refers to BlackPoS, further proves the link between the two malware and the operation.

Aside from the PoS plugin, other modules usually downloaded from a subdirectory in the C&C server make up this malware’s entirety. These include plugins for getting screenshots, passwords, mails, and more. Without the plugins, Gorynych routines mostly focus on anti-analysis, information theft, and installations. In the Diamond Fox builder, the keylogger and PoS grabber functionalities are disabled by default. However, with Operation Black Atlas, these options were turned on, which proves that cybercriminals running this are intentionally targeting PoS systems.

After downloading its plugins, Gorynych reports to its server via gate.php using HTTP POST. It uses its own user-agent that can be found in its configuration file. The parameters consist of system information used to profile the bot, mainly for identification in the Gorynych control panel. The posted information is encrypted using a simple XOR operation.
Information<https://blog.trendmicro.com/trendlabs-security-intelligence/operation-black-atlas-part-2-tools-and-malware-used-and-how-to-detect-them/>
AlienVault OTX<https://otx.alienvault.com/browse/pulses?q=tag:gorynich>

Last change to this tool card: 24 May 2020

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All groups using tool Gorynych

ChangedNameCountryObserved

APT groups

 Operation Black Atlas[Unknown]2015 

1 group listed (1 APT, 0 other, 0 unknown)

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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