Sunday, December 10, 2023

Gold Melody Attacking Organizations With Burp Extension, Mimikatz, and Other Tools

The financially motivated GOLD MELODY threat group has been active at least since 2017, attacking organizations by taking advantage of flaws in unpatched internet-facing servers.

A threat group serves as an initial access broker (IAB) by selling access to organizations that have been compromised to other cybercriminals for their gain.

“The victimology suggests opportunistic attacks for financial gain rather than a targeted campaign conducted by a state-sponsored threat group for espionage, destruction, or disruption,” said SecureWorks Counter Threat Unit (CTU).

Tools Used By The Group

Once within a compromised environment, GOLD MELODY uses proprietary remote access trojans (RATs), web shells, built-in operating system utilities, and tunneling tools. The tools observed are:

Burp Suite Collabfiltrator, IHS Back-Connect backdoor, Wget, Mimikatz, TxPortMap, WinExe, GOTROJ, PAExec, AUDITUNNEL, PuTTY and 7-Zip, Responder.

The behavior seen in five Secureworks IR engagements between July 2020 and July 2022 was linked by researchers to GOLD MELODY.

Tools and TTPs observed across five Secureworks IR engagements

The attacks observed involved taking advantage of a variety of issues, including those affecting Flexera FlexNet (CVE-2021-4104), Oracle E-Business Suite (CVE-2016-0545), Apache Struts (CVE-2017-5638), Sitecore XP (CVE-2021-42237), and Oracle E-Business Suite (CVE-2016-0545).

Particularly, after breaking into a network by taking advantage of flaws in servers that are accessible over the internet, GOLD MELODY tries to build persistence within the infected network. For persistence, GOLD MELODY deployed JSP web shells. 

The threat actors were able to access the server via this web shell and come back frequently to issue commands for reconnaissance. To decode the Base64-encoded web shell in July 2022, the threat actors created a PowerShell script utilizing the Burp Suite Collaborfiltrator extension.

Snippet from Collabfiltrator PowerShell script to decode Base64-encoded web shell


Defense evasion efforts by GOLD MELODY were unsuccessful. In the five intrusions that researchers looked into, early discovery of the malicious activities seems to have stopped the criminal group from accomplishing its goals.

The large number of organizations that GOLD MELODY has targeted implies that the organization poses a serious threat. Its dependence on exploiting flaws in unpatched servers that are accessible through the internet highlights the significance of effective patch management.

Monitoring the perimeter and endpoints is a reliable and efficient method for stopping harmful activities when a group enters the network.

Keep informed about the latest Cyber Security News by following us on Google NewsLinkedinTwitter, and Facebook.


Latest articles

WordPress POP Chain Flaw Exposes Over 800M+ Websites to Attack

A critical remote code execution vulnerability has been patched as part of the Wordpress...

Russian Star Blizzard New Evasion Techniques to Hijack Email Accounts

Hackers target email accounts because they contain valuable personal and financial information. Successful email...

Exploitation Methods Used by PlugX Malware Revealed by Splunk Research

PlugX malware is sophisticated in evasion, as it uses the following techniques to avoid...

TA422 Hackers Attack Organizations Using Outlook & WinRAR Vulnerabilities

Hackers exploit Outlook and WinRAR vulnerabilities because these widely used software programs are lucrative...

Bluetooth keystroke-injection Flaw: A Threat to Apple, Linux & Android Devices

An unauthenticated Bluetooth keystroke-injection vulnerability that affects Android, macOS, and iOS devices has been...

Atlassian Patches RCE Flaw that Affected Multiple Products

Atlassian has been discovered with four new vulnerabilities associated with Remote Code Execution in...

Reflectiz Introduces AI-powered Insights on Top of Its Smart Alerting System

Reflectiz, a cybersecurity company specializing in continuous web threat management, proudly introduces a new...

Endpoint Strategies for 2024 and beyond

Converge and Defend

What's the pulse of Unified Endpoint Management and Security (UEMS) in Europe? Join us live to uncover the strategies that are defining endpoint security in the region.

Related Articles