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  • 8220 Gang used new ScrubCrypt crypter in recent cryptojacking attacks

8220 Gang used new ScrubCrypt crypter in recent cryptojacking attacks

Pierluigi Paganini March 09, 2023

A threat actor tracked as 8220 Gang has been spotted using a new crypter called ScrubCrypt in cryptojacking campaigns.

Fortinet researchers observed the mining group 8220 Gang using a new crypter called ScrubCrypt in cryptojacking attacks.

“Between January and February 2023, FortiGuard Labs observed a payload targeting an exploitable Oracle Weblogic Server in a specific URI.” reads the analysis published by Fortinet. “This payload extracts ScrubCrypt, which obfuscates and encrypts applications and makes them able to dodge security programs. It already has an updated version, and the seller’s webpage (Figure 1) guarantees that it can bypass Windows Defender and provide anti-debug and some bypass functions.”

The group is known for exploiting publicly disclosed vulnerabilities to compromise targets.

Between January and February, the experts observed attacks originating from 163[.]123[.]142[.]210 and 185[.]17[.]0[.]19 that targeted an HTTP URI, “wls-wsat/CoordinatorPortType.” This URI belongs to an Oracle Weblogic server.

Upon successful exploitation of vulnerable Oracle WebLogic servers, it will download a PowerShell script, named “bypass.ps1,” which contains the ScrubCrypt crypter.

The PowerShell script is encoded to avoid detection by AntiVirus solutions.

The ScrubCrypt crypter is available for sale on hacking forums, it allows securing applications with a unique BAT packing method.

ScrubCrypt

The experts noticed that encrypted data at the top can be split into four parts using backslash “\”. The final two parts are the key and initial value for AES CBC decryption.

The attribution of the attacks to the 8220 Gang is also based on the crypto wallet address used in the recent campaigns and the server IP address used in the Monero miner.

“The crypto wallet address, 46E9UkTFqALXNh2mSbA7WGDoa2i6h4WVgUgPVdT9ZdtweLRvAhWmbvuY1dhEmfjHbsavKXo3eGf5ZRb4qJzFXLVHGYH4moQ, and the server IP address used in Monero miner have all been used by the 8220 Gang in the past.” concludes the report. “It’s why we believe the whole attack was launched by this threat actor, although the port number used is no longer 8220.”

“8220 Gang is a well-known miner group that usually leverages public file-sharing websites and targets system vulnerabilities to infiltrate a victim’s environment. Within a very short time, it has evolved to use a newer crypter variant, “ScrubCrypt.” 

ScrubCrypt

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, ScrubCrypt)


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