Presumably the latter are test files – a couple of files that the victim sends to the attackers to make sure that the files can be decrypted. Some of them contain previously generated decryptors and several ordinary files: documents, photos, etc. The leaked private keys are located in 257 folders (only one of these folders contains two keys). This strain was used in multiple attacks against companies and state institutions. The malware variant whose keys were leaked was discovered by Kaspersky specialists in December 2022.

However, a year ago, once the source code was leaked, multiple modifications of Conti ransomware were created by various criminal gangs and used in their attacks.

After analysing the data, which contained 258 private keys, the source code and some pre-compiled decryptors, Kaspersky released a new version of the public decryptor to help victims of this modification of Conti ransomware.Ĭonti appeared in late 2019 and was very active throughout 2020, accounting for more than 13% of all ransomware victims during this period. In late February 2023, Kaspersky experts uncovered a new portion of leaked data published on forums.

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