Sunday, November 10, 2024
HomeCyber AttackHackers Modified Cobalt Strike Capabilities to Attack macOS Users

Hackers Modified Cobalt Strike Capabilities to Attack macOS Users

Published on

Malware protection

Geacon, a Cobalt Strike implementation written in Golang, is likely to attract the attention of threat actors looking for vulnerable macOS devices.

Threat actors have been employing Cobalt Strike to breach Windows PCs for years, despite the infosec industry’s ongoing efforts to stop it.

SentinelOne’s results confirm this after it saw an increase in the number of Geacon payloads that have been detected on VirusTotal lately.

- Advertisement - SIEM as a Service

“While some of these are likely red-team operations, others bear the characteristics of genuine malicious attacks,” SentinelOne reports.

Fortra created Cobalt Strike, a well-known red teaming and adversary simulation tool. Due to their many capabilities, threat actors have long misused illegally cracked versions of the software.

While Cobalt Strike’s post-exploitation activity has mostly targeted Windows, assaults against macOS are rather uncommon.

Geacon was a promising Cobalt Strike port that first surfaced on GitHub, but it didn’t seem like many hackers were interested in it.

SentinelOne notes that this changed in April as a result of two Geacon forks—Geacon Plus, a free and publicly accessible version, and Geacon Pro, a private, paid version—being uploaded on GitHub by unidentified Chinese developers.

Mach-O payloads for the free version of the fork have reportedly been in development since November 2022, according to historical data from Virus Total.

The Geacon fork has been added to the ‘404 Starlink project,’ a public GitHub repository dedicated to red-team pen-testing tools that have been maintained by the Zhizhi Chuangyu Laboratory since 2020.

This addition contributed to the Geacon fork’s rise in popularity and appears to have attracted users with malicious intent.

Malicious Geacon Deployment

Two VirusTotal submissions from the dates of April 5 and April 11 contained two instances of malicious Geacon deployment, according to SentinelOne.

The first one is an AppleScript applet file with the name “Xu Yiqing’s Resume_20230320.app,” which checks to see if a macOS system is supported before downloading one unsigned “Geacon Plus” payload from a command and control (C2) server with a Chinese IP address.

The user is shown a two-page decoy document that is integrated into the Geacon binary before it starts its beaconing activity. An individual named “Xu Yiqing”‘s resume is visible in an opened PDF document. 

Geacon Decoy PDF

“The compiled Geacon binary has a multitude of functions for tasks such as network communications, encryption, decryption, downloading further payloads, and exfiltrating data”, researchers explain.

The second payload is a trojanized version of the SecureLink application used for secure remote support called SecureLink.app and SecureLink_Client, including a copy of “Geacon Pro.”

The binary in this instance only supports Mac OS X 10.9 (Mavericks) and subsequent versions, which are Intel-based systems.

File details

The app asks for access to the computer’s microphone, camera, contacts, images, reminders, and administrator rights upon launch, even though these features are typically covered by Apple’s Transparency, Consent, and Control (TCC) privacy framework.

Although these are exceedingly hazardous permissions, the kind of fake application allows for the user’s suspicion to be allayed, which deceives them into approving the app’s request.

Access permission details

Final Words

Researchers say enterprise security teams can benefit from attack simulation tools such as Cobalt Strike and its macOS Go adaption, Geacon.

“It is quite likely that some of the activity we are observing around this tool is legitimate red team use, but it is also likely that genuine threat actors will make use of the public and possibly even the private forks of Geacon now available to them,” researchers.

Struggling to Apply The Security Patch in Your System? – 
Try All-in-One Patch Manager Plus

Gurubaran
Gurubaran
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Latest articles

CISA Warns of Critical Palo Alto Networks Vulnerability Exploited in Attacks

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warns organizations of a critical vulnerability...

Cisco Desk Phone Series Vulnerability Lets Remote Attacker Access Sensitive Information

A significant vulnerability (CVE-2024-20445) has been discovered in Cisco Desk Phone 9800 Series, IP...

Cisco Flaw Let Attackers Run Command as Root User

A critical vulnerability has been discovered in Cisco Unified Industrial Wireless Software, which affects...

Researchers Detailed Credential Abuse Cycle

The United States Department of Justice has unsealed an indictment against Anonymous Sudan, a...

Free Webinar

Protect Websites & APIs from Malware Attack

Malware targeting customer-facing websites and API applications poses significant risks, including compliance violations, defacements, and even blacklisting.

Join us for an insightful webinar featuring Vivek Gopalan, VP of Products at Indusface, as he shares effective strategies for safeguarding websites and APIs against malware.

Discussion points

Scan DOM, internal links, and JavaScript libraries for hidden malware.
Detect website defacements in real time.
Protect your brand by monitoring for potential blacklisting.
Prevent malware from infiltrating your server and cloud infrastructure.

More like this

CISA Warns of Critical Palo Alto Networks Vulnerability Exploited in Attacks

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warns organizations of a critical vulnerability...

Cisco Desk Phone Series Vulnerability Lets Remote Attacker Access Sensitive Information

A significant vulnerability (CVE-2024-20445) has been discovered in Cisco Desk Phone 9800 Series, IP...

Cisco Flaw Let Attackers Run Command as Root User

A critical vulnerability has been discovered in Cisco Unified Industrial Wireless Software, which affects...