Trojan-Ransom.Win32.Cryakl

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Ransom

This type of Trojan modifies data on the victim computer so that the victim can no longer use the data, or it prevents the computer from running correctly. Once the data has been “taken hostage” (blocked or encrypted), the user will receive a ransom demand. The ransom demand tells the victim to send the malicious user money; on receipt of this, the cyber criminal will send a program to the victim to restore the data or restore the computer’s performance.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Malware of this family is distributed in various ways, such as spam, exploit kits, vulnerable server software, and weak RDP credentials. Once launched, it will iterate through all drives, excluding some system directories and the directory that holds user’s temporary files. After that, it encrypts almost all user files by using a custom symmetric crypto algorithm. During the encryption process, special markers such as {ENCRYPTSTART} and {ENCRYPTENDED} are added to the encrypted files. The malware also creates the file how_to_decrypt.hta in each directory with encrypted files.

Top 10 countries with most attacked users (% of total attacks)

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