![]() The note warns that attempting to decrypt or rename the files will corrupt them and emphasizes that only the attacker can provide the decryption key. Victims are given an ID number and instructed to email the attacker (via or to initiate negotiations. The note offers to decrypt a small, unimportant file as proof of the attacker's ability to restore encrypted files. Instead, victims are instructed to pay a ransom in Bitcoin or Monero in exchange for the decryption of their files. The note advises victims not to attempt to recover the files themselves, as doing so will corrupt them and render them permanently inaccessible. ![]() The ransom note states that all files on the infected system have been encrypted and cannot be recovered. Screenshot of files encrypted by this ransomware: KEEPCALM" extension to filenames).Īn example of how KEEPCALM renames files: it changes " 1.jpg" to " 1.jpg-+Id(91264586) " 2.png" to " 2.png-+Id(91264586) and so forth. Also, it creates the " ReadMe.txt" file (a ransom note) and modifies filenames (appends the victim's ID, email address, and ". The purpose of KEEPCALM is to encrypt files. KEEPCALM is ransomware that we have discovered during an analysis of malware samples submitted to the VirusTotal site.
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