Friday, July 19, 2024

Hackers Use SYSTEMBC Tool to Maintain Access to Compromised Network

To maintain access to compromised networks, hackers use specialized hacking tools. Such tools help the threat actors evade the detection mechanisms and maintain control over the compromised system.

This unauthorized access enables the threat actors to extract sensitive information from the compromised networks’ systems.

Cybersecurity researchers at Kroll recently discovered a malicious “SYSTEMBC” tool that hackers have been exploiting actively.

Free Trial

Streaming Malware Service

Open Suspicious Files & Links in the ANY RUN Sandbox Safely; Try All Features for Free. Understand malware behavior, collect IOCs, and easily map malicious actions to TTPs — all in our interactive sandbox.

SYSTEMBC Tool to Maintain Access

Kroll noted a significant surge in the use of the malicious “SYSTEMBC” tool for network access in Q2-Q3 of 2023. 

This tool was first seen in 2018, and the SYSTEMBC acts as a SOCKS5 proxy that provides threat actors with persistent access or a backdoor. 

Besides this, the SYSTEMBC is used by various threat actors in different campaigns and alongside a multitude of malware families.

Here below, we have mentioned all the malware families:-

  • CUBA

SYSTEMBC can be bought from the dark web as it includes malware, a C2 server, and a PHP admin portal. Kroll CTI explored its C2 server by revealing English and Russian setup instructions.

The C2 app has “server.exe” for Windows and “server.out” for Linux. The focus of the security analysts is on the Linux server. 

It opens ports for IPC (usually 4000) and C2 traffic (commonly 443). Active implants have ports ranging from 4001 to 49151.

The configuration details are in the binary, with labeled and padded port strings for easy identification.

Port Settings Within Binary with Visible Padding (Source - Kroll)
Port Settings Within Binary with Visible Padding (Source – Kroll)

Port 49151 suggests the developer’s familiarity with low-level programming like C or Assembly. In hex, it’s 0xBFFF, one less than 0xC000, which indicates an awareness of integer memory allocation. 

SYSTEMBC hints at possible Assembly code in the Linux Server binary as it’s in C. The rigid PHP panel script relies heavily on “if” statements, which favor echo over PHP’s nested HTML. The hardcoded port 4000 in the TCP connection setup implies a preferred configuration. 

The “secondsToTime” function was borrowed from Stack Overflow, revealing a mix of skills. The use of PHP might be practical since it suggests a focus on functionality over technology preference. 

While the control panel is completely crucial for attackers, it features a table with key machine details that highlights the C2 server ports for SOCKS traffic.

SYSTEMBC C2 Panel (Source - Kroll)
SYSTEMBC C2 Panel (Source – Kroll)

Core functionalities of SYSTEMBC:-

  • SOCKS5
  • Loader functionality
  • Module loading

SYSTEMBC poses a significant threat as RHYSIDA ransomware groups often use it to maintain access post-compromise. 

In a healthcare case, compromised credentials and a Citrix NetScaler vulnerability allowed SYSTEMBC deployment, enabling threat actors to perform further attacks with tools like Advanced Port Scanner, AnyDesk, and MegaSync.

However, the successful encryption also led to password changes, blocking IT access.


Latest articles

Octo Tempest Know for Attacking VMWare ESXi Servers Added RansomHub & Qilin to Its Arsenal

Threat actors often attack VMware ESXi servers since they accommodate many virtual machines, which...

TAG-100 Actors Using Open-Source Tools To Attack Gov & Private Orgs

Hackers exploit open-source tools to execute attacks because they are readily available, well-documented, and...

macOS Users Beware Of Weaponized Meeting App From North Korean Hackers

Meeting apps are often targeted and turned into weapons by hackers as they are...

Hackers Exploiting Legitimate RMM Tools With BugSleep Malware

Since October 2023, MuddyWater, which is an Iranian threat group linked to MOIS, has...

Cybercriminals Exploit Attack on Donald Trump for Crypto Scams

Researchers at Bitdefender Labs remain ever-vigilant, informing users about the latest scams and internet...

New TE.0 HTTP Request Smuggling Flaw Impacts Google Cloud Websites

HTTP Request Smuggling is a flaw in web security that is derived from variations...

Volcano Demon Group Attacking Organizations With LukaLocker Ransomware

The Volcano Demon group has been discovered spreading a new ransomware called LukaLocker, which...
Tushar Subhra Dutta
Tushar Subhra Dutta
Tushar is a Cyber security content editor with a passion for creating captivating and informative content. With years of experience under his belt in Cyber Security, he is covering Cyber Security News, technology and other news.

Free Webinar

Low Rate DDoS Attack

9 of 10 sites on the AppTrana network have faced a DDoS attack in the last 30 days.
Some DDoS attacks could readily be blocked by rate-limiting, IP reputation checks and other basic mitigation methods.
More than 50% of the DDoS attacks are employing botnets to send slow DDoS attacks where millions of IPs are being employed to send one or two requests per minute..
Key takeaways include:

  • The mechanics of a low-DDoS attack
  • Fundamentals of behavioural AI and rate-limiting
  • Surgical mitigation actions to minimize false positives
  • Role of managed services in DDoS monitoring

Related Articles