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New ‘HavanaCrypt’ Ransomware Distributed as Faux Google Software program Replace

By Ionut Arghire on July 08, 2022

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Safety researchers at Pattern Micro have recognized a brand new ransomware household that’s being delivered as a pretend Google Software program Replace software.

Dubbed HavanaCrypt, the ransomware performs a number of anti-virtualization checks and makes use of a Microsoft webhosting service IP handle for its command and management (C&C) server, which permits it to evade detection.

Throughout their evaluation of HavanaCrypt, Pattern Micro additionally found that it makes use of a namespace technique perform that queues a technique for execution and that it employs the modules of an open-source password supervisor throughout encryption.

Compiled in .NET and guarded utilizing the Obfuscar open-source obfuscator, HavanaCrypt hides its window after execution, then checks the AutoRun registry for a “GoogleUpdate” entry and continues with its routine if the registry is just not discovered.

Subsequent, it proceeds with its anti-virtualization routine, which consists of 4 levels: first, it checks for providers related to digital machines, then for recordsdata associated to digital machine functions, then for file names used for VM executables, after which it checks the machine’s MAC handle.

Ought to all of the checks cross, the malware downloads a file named “2.txt” from a Microsoft webhosting service IP handle, saves it as a .bat file, and executes it. The batch file accommodates directions for Home windows Defender to disregard detections within the “Home windows” and “Person” directories.

Subsequent, the ransomware terminates a sequence of working processes, together with these for database functions (Microsoft SQL Server and MySQL) and people of Microsoft Workplace and Steam.

Then, HavanaCrypt queries all disk drives and deletes all shadow copies, and makes use of Home windows Administration Instrumentation (WMI) to establish system restore cases and delete them.

After that, the ransomware drops executable copies of itself within the “ProgramData” and “StartUp” folders, units them as hidden system recordsdata, and drops within the “Person Startup” folder a .bat file containing a perform that disables the Process Supervisor.

HavanaCrypt generates a singular identifier (UID) based mostly on system info resembling processor cores and ID, processor identify, socket, motherboard producer and identify, BIOS model, and product quantity.

Throughout encryption, the malware makes use of the CryptoRandom perform of KeePass Password Protected for producing encryption keys. The risk appends the “.Havana” extension to the encrypted recordsdata, and avoids encrypting recordsdata with sure extensions or these in particular directories, together with that of the Tor browser, suggesting that the malware writer may plan communication over the Tor community.

The malware additionally creates a textual content file that logs all of the directories containing the encrypted recordsdata. The file is known as foo.txt and the ransomware encrypts it as effectively. No ransom notice is dropped.

“This could be a sign that HavanaCrypt remains to be in its improvement part. However, you will need to detect and block it earlier than it evolves additional and does much more injury,” Pattern Micro explains.

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