Monday, December 4, 2023

Hackers Exploit Critical Oracle WebLogic Server Vulnerability by Hiding Malware in Certificate Files(.cer)

Hackers abuse Oracle WebLogic Server Vulnerability CVE-2019-2725 to deliver Monero Miner. The vulnerability is easily exploitable, any unauthenticated attacker with HTTP access to the server can attack without authentication.

Trend Micro observed a new cryptocurrency-mining activity involving the vulnerability and to hide the malicious code they used certificate files.

Malware Infection

Malware exploits CVE-2019-2725 to execute a PowerShell command to download the malicious code obfuscated in the .cer file. The PowerShell scripts download the encoded certificate file from the attacker’s server.

To decode the certificate file CertUtil is used, CertUtil is a command-line program that is installed along with Certificate Services.

Infection Chain

The extracted file update.ps1 is executed using PowerShell command, and the downloaded certificate is deleted using command.

“When we downloaded the certificate file, we noticed that it looked like a normal Privacy-Enhanced Mail (PEM) format certificate. However, upon decoding the base64 content, we found that, instead of the commonly used X.509 TLS file format, it comes in the form of the PS command,” reads Trend Micro report.

Last month another campaign leveraged the vulnerability to download Sodinokibi ransomware and to encrypt the customer’s systems.

It is recommended to patch the CVE-2019-2725 vulnerability; you can find the security alert published by Oracle and the Patch Availability here.

Indicators of Compromise



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