There are several different ransomware infections which append a random 4, 5, 6, 7 character extension
to the end of all affected filenames. CTB-Locker
and Maktub Locker
are the two most common ransomware infections which use a random 6-7
character extension appended to the end of the file name. The newest variant of Crypt0L0cker
appends a random 6
lower alphabetic character extension. Alma Locker
appends a random 5-6
character extension. Goldeneye
appends an random 8
character extension. Princess Locker
appends a random 4-5
hexadecimal character extension. Mischa
appends a random 4
character extension. Locked-In
appends a random 5-15
character extension. Some Xorist Ransomware
variants will also have a random character extension appended to the end of the file name.
Did you find any ransom notes
and if so, what is the actual name of the note? These infections are created to alert victims that their data has been encrypted and demand a ransom payment. Check your documents folder (C:\ProgramData, C:\Documents and Settings\All Users\Application Data) for an image the malware typically uses for the background note or a randomly named .html, .txt, .png, .bmp, .url
file. Most ransomware will also drop a ransom note in every directory/affected folder where data has been encrypted.
Did the cyber-criminals provide an email address to send payment to? If so, what is the email address?
The best way to identify the different ransomwares that use "random character extensions" is the ransom note (including it's name), samples of the encrypted files, the malware file itself or at least information related to the email address used by the cyber-criminals to request payment.
encrypted files and ransom notes together at ID Ransomware
for assistance with identification
provides a more positive match and helps to avoid false detections.
Based on infection rates we see, you are most likely dealing with CTB-Locker or the new Crypt0L0cker.