Lorenz

First seen around May 2021, this group has since been targeting enterprise organizations worldwide, using a double extortion technique utilizing a data leak site (“DLS”) to house victims’ stolen and exposed data. If no ransom is paid after all the victims’ data is leaked as password-protected RAR archives, the group will release the password to access the archives to make the stolen files publicly available to anyone who wishes to download and view the stolen data. Following an analysis of the group’s malware, researchers at Dutch cybersecurity company Tesorion developed a decryption tool for this group’s ransomware that sometimes can decrypt files affected by Lorenz without paying a ransom. According to online sources, this group appears to be a variant of the ThunderCrypt ransomware group. However, it is not confirmed if Lorenz is the same group or may have purchased the ransomware source code to build its own variant.