New CryWiper wiper targets Russian entitiesSecurity Affairs | Boot Tech

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Specialists detected a brand new information wiper, dubbed CryWiper, that was utilized in harmful assaults in opposition to the mayor’s places of work and Russian courts.

Kaspersky researchers found a beforehand unknown information eraser, dubbed CryWiper, that was utilized in harmful assaults in opposition to Russian mayor’s places of work and courts.

The malware masquerades as ransomware, however evaluation of the code exhibits that it doesn’t really encrypt, however solely destroys information on the contaminated system.

In keeping with Kaspersky, the wiper was first detected within the fall of 2022 when it was utilized in an assault in opposition to the community of a corporation within the Russian Federation.

“After analyzing a malware pattern, we discovered that this Trojan, whereas posing as ransomware and extorting cash from the sufferer for ‘decrypting’ information, really doesn’t encrypt, however as an alternative purposefully destroys information on the affected system.” . learn the report revealed by Kaspersky. “Moreover, an evaluation of the Trojan program code confirmed that it was not a developer error, however quite its unique intent.”

The CryWiper pattern analyzed by the researchers is a 64-bit Home windows executable written in C++ and compiled with the MinGW-w64 toolkit and the GCC compiler. The consultants famous that this improvement course of for Home windows C/C++ malware builders is uncommon.

Specialists imagine that the malware was particularly designed to focus on Home windows methods as a result of it makes use of plenty of WinAPI perform calls.

As soon as executed, CryWiper makes use of Process Scheduler and the schtasks create command to create a activity to run your file each 5 minutes.

CryWiper Wipers

The cleaner contacts the command and management server by way of an HTTP GET request and passes the identify of the contaminated system as a parameter.

The C2, in flip, responds with a “run” or “do not run” command, to find out if the malware must be launched.

In some circumstances, the researchers noticed execution delays of 4 days (345,600 seconds) to cover the logic behind the an infection.

Upon receiving a execute response, CryWiper stops processes associated to MySQL and MS SQL database servers, MS Alternate mail server, and MS Energetic Listing internet companies utilizing the taskkill command. This motion unlocks the information utilized by the above legit functions earlier than encrypting them.

CryWiper will cease essential processes associated to MySQL, MS SQL database servers, MS Alternate e-mail servers, and MS Energetic Listing internet companies to launch locked information for destruction.

The cleaner additionally deletes shadow copies on the compromised machine to forestall victims from restoring deleted information.

The malware additionally adjustments the registry setting HKLMSYSTEMCurrentControlSetControlTerminal ServerfDenyTSConnections to forestall RDP connections to the contaminated system.

To destroy customers’ information, the cleaner generates an information stream utilizing the “Mersenne Vortex” pseudo-random quantity generator that overwrites the unique file content material.

The malware provides the .MOURN extension to information it has corrupted and drops ransom notes (‘README.txt’) demanding 0.5 Bitcoin for decryption.

“CryWiper positions itself as a ransomware program, that’s, it claims that the sufferer’s information are encrypted and, if a ransom is paid, they are often restored. Nevertheless, it is a hoax: in reality, the info has been destroyed and can’t be returned. CryWiper’s exercise proves as soon as once more that paying the ransom doesn’t assure file restoration.” concludes the report.

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Pierluigi Paganini

(Safety Points hacking, CryWiper)

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New CryWiper wiper targets Russian entitiesSecurity Affairs