Software

Gpcode update

Our StopGpcode project has attracted a lot of attention from individual researchers and organizations who are interested in solving the puzzle of the blackmailing virus. Thanks for all the feedback.

Among other things, we’ve been asked a lot about how the virus propagates. Having analyzed a number of infected computers we’ve come to the conclusion that the virus gets onto the victim machine with the help of another malicious program – a bot with Trojan-Downloader functionality. The victim machines had been infected with this malicious program well before Gpcode appeared on them; and the bot downloaded a whole range of other Trojan programs in addition to the Gpcode virus.

The RSA private key hasn’t been found, but some interesting ideas have surfaced. For instance, a detailed analysis of the algorithm used by Gpcode has shown that the author of the virus made an error which makes it possible (under certain circumstances) to decrypt encrypted files without the private key.

This method restores from 0% to 98% of all encrypted files on the computer. The results depend on a number of factors, beginning with the system that was attacked. At the moment it’s impossible to give an average number of files that could be recovered from a ‘typical’ computer.

Kaspersky Lab researchers are currently working on creating a file restoration utility that will utilize this new method.

Gpcode update

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Reports

Operation TunnelSnake

A newly discovered rootkit that we dub ‘Moriya’ is used by an unknown actor to deploy passive backdoors on public facing servers, facilitating the creation of a covert C&C communication channel through which they can be silently controlled. The victims are located in Africa, South and South-East Asia.

APT trends report Q1 2021

This report highlights significant events related to advanced persistent threat (APT) activity observed in Q1 2021. The summaries are based on our threat intelligence research and provide a representative snapshot of what we have published and discussed in greater detail in our private APT reports.

The leap of a Cycldek-related threat actor

The investigation described in this article started with one such file which caught our attention due to the various improvements it brought to this well-known infection vector.

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