Ramnit

What is Ramnit malware

Ramnit emerged in 2010 as a computer virus, initially infecting Windows executable files (EXE, DLL), HTML files, and later expanding to target other file types. Over time, it has evolved to include the functions of a banking trojan, inter alia by incorporating elements from the Zeus banking trojan's source code in 2011.

Now it focuses on financial data theft and is used for financial fraud, credential theft, remote access, and botnet operations. Besides banking credentials, it is able to steal information for various online accounts.

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Ramnit infects and modifies files such as .dll, .exe, and .html on a system to spread itself and establishes backdoors for other malware, providing remote access to attackers. The infected endpoints are added to a botnet for coordinated attacks or further distribution of malware.

Ramnit allows attackers full system control over a device and further propagates through networks, escalating from a single machine infection to an organizational one.

Technical details of Ramnit malware

Ramnit is equipped with extensive malicious capabilities:

• Ramnit infects legitimate system files, ensuring it reloads on every reboot. It creates scheduled tasks or modifies registry keys like (HKCU\Software\Microsoft\Windows\CurrentVersion\Run).
• Man-in-the-browser (MitB) attacks are used to intercept online banking credentials.
• Fake login forms on legitimate banking sites are displayed via web injects.
• Ramnit can steal passwords stored in popular browsers including Chrome and Firefox and in Windows Credential Manager.
• Persistence is supported by infecting legitimate files, making removal difficult without damaging the OS.
• It logs keystrokes, captures screenshots, and uploads stolen data to C2 servers.
• Infected endpoints join a massive botnet used in DDoS attacks, spam campaigns, and further malware distribution.
• Uses SMB exploits and credential dumping techniques to spread across corporate networks.

Ramnit employs advanced evasion tactics to bypass detection: modifies its code to change its signature with each infection (polymorphism); runs within legitimate system processes (e.g., explorer.exe, svchost.exe); detects virtual machines; encrypts C2 traffic to avoid network detection; continuously generates new C2 domains.

The Execution process of Ramnit

To observe Ramnit’s activities in real time, we can detonate it in the safe environment of ANY.RUN’s Interactive Sandbox.

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Ramnit typically spreads via phishing campaigns that use multi-stage malware. When a victim opens the initial payload, it downloads additional components and installs the Trojan. Once active, Ramnit harvests financial credentials and other sensitive data (e.g., social media and email).

After installation, Ramnit connects to its command and control (C&C) servers and often uses a domain generation algorithm (DGA), which creates random domain names to evade DNS blocklists. The C&C server uses the same DGA to register and manage these domains, making Ramnit harder to disrupt.

Ramnit’s modular design lets it download extra modules as needed. It can inject malicious code into browsers—often during online banking sessions — to steal data in real time. To evade detection, it uses techniques like process hollowing, injecting code into legitimate processes like “msiexec.exe” and “explorer.exe.” It can also fetch a VNC module for remote access.

Finally, Ramnit creates a proxy network of infected machines, relaying malicious traffic through multiple hosts to hide attacker activity. Overall, its execution chain relies on phishing-based distribution, DGA-powered C&C communication, modular expansion, and proxy networks to evade detection and facilitate broader attacks.

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Ramnit malware distribution methods

Ramnit spreads through multiple infection vectors, making it highly persistent and difficult to eradicate. It is delivered via phishing emails containing malicious Word, Excel, or PDF documents with embedded macros or exploit code. Users are infected when visiting compromised websites that host exploit kits targeting browser vulnerabilities.

Besides, Ramnit has been dropped by other malware families, including Emotet and Dridex, to expand its botnet.

It also can spread via USB drives, SMB shares, and network infections, bypassing internet defenses.

Conclusion

Hybrid capabilities of Ramnit make it an especially serious threat to organizations worldwide. It can function as a banking trojan, worm, RAT, and credential stealer simultaneously. To avoid suffering from Ramnit infection, make sure to introduce proper preventive security measures.

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