Security Experts:

Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Malware & Threats

Muhstik Botnet Exploits Recent Oracle WebLogic Vulnerability

A recently observed variant of the Muhstik botnet is exploiting a recently disclosed Oracle WebLogic server vulnerability for cryptomining and distributed denial of service (DDoS) attacks.

A recently observed variant of the Muhstik botnet is exploiting a recently disclosed Oracle WebLogic server vulnerability for cryptomining and distributed denial of service (DDoS) attacks.

Tracked as CVE-2019-2725 and patched last week, the critical vulnerability is a deserialization issue that allows unauthenticated remote command execution, and has been exploited in attacks before a patch was released. 

Soon after the vulnerability became public knowledge and proof-of-concept code was made public, security organizations started to observe new attacks targeting it, including the new Sodinokibi ransomware

According to Palo Alto Networks, a new variant of the Muhstik Linux botnet emerged over the weekend, which attempts to leverage the very same WebLogic flaw to infect systems. 

Alive since March 2018 and packing wormlike self-propagating capabilities, Muhstik is known to target Linux servers and Internet of Things (IoT) devices to abuse them for cryptocurrency mining or for DDoS attacks. 

The botnet has been observed leveraging multiple exploits for infection purposes, including some targeting WordPress and Drupal vulnerabilities. It even attempted to exploit a previous WebLogic flaw, CVE-2017-10271

The attacks targeting the new CVE-2019-2725 WebLogic vulnerability feature an exploit payload that includes a shell command to download a .php file from the IP address 165.227.78[.]159. The security researchers say they couldn’t download the payload but that they believe it is a PHP webshell.

Previously, the botnet made use of the IP address 165.227.78[.]159 as a reporting server, to collect information of bots. 

“The Oracle WebLogic wls9-async RCE vulnerability is now being used by Muhstik botnet in the wild and there is a great possibility that it will be exploited by other malware families in the future,” Palo Alto Networks concludes. 

Related: New Sodinokibi Ransomware Delivered via Oracle WebLogic Flaw

Related: Oracle Patches WebLogic Zero-Day Exploited in Attacks

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Expert Insights

Related Content

Malware & Threats

Microsoft plans to improve the protection of Office users by blocking XLL add-ins from the internet.

Cybercrime

CISA, NSA, and MS-ISAC issued an alert on the malicious use of RMM software to steal money from bank accounts.

Cybercrime

Chinese threat actor DragonSpark has been using the SparkRAT open source backdoor in attacks targeting East Asian organizations.

Cybercrime

A recently disclosed vBulletin vulnerability, which had a zero-day status for roughly two days last week, was exploited in a hacker attack targeting the...

Application Security

Electric car maker Tesla is using the annual Pwn2Own hacker contest to incentivize security researchers to showcase complex exploit chains that can lead to...

Malware & Threats

Cybercrime in 2017 was a tumultuous year "full of twists and turns", with new (but old) infection methods, a major return to social engineering,...

Malware & Threats

Norway‎-based DNV said a ransomware attack on its ship management software impacted 1,000 vessels.

Cybercrime

Security researchers with Juniper Networks’ Threat Labs warn of a new Python-based backdoor targeting VMware ESXi virtualization servers.