Discover Process Doppelgänging – a cybercriminal trick that makes malware invisible to most antivirus programs! This method allows dangerous code to be run in Windows without leaving a single suspicious file on the disk – an ideal solution for those who want to bypass even advanced security measures.
What is Process Doppelgänging?
It is a modern cyberattack technique revealed in 2017 by specialists Tal Liberman and Eugene Kogan during Black Hat Europe. Process Doppelgänging is inspired by the earlier Process Hollowing method but takes things a step further by using advanced transactional features of the NTFS file system in Windows.
As a fileless attack, Process Doppelgänging allows malicious programs to be executed without saving them to disk, effectively hiding any traces from standard protection and threat analysis tools.
How does Process Doppelgänging work?
1. Initiating a “secret transaction” in NTFS
First, the cybercriminal initiates a transaction in the Windows file system. This allows them to modify files “on a trial basis” without those changes becoming immediately visible across the whole system.
2. Replacing a legitimate program
Within this closed transaction, the contents of a legitimate .exe file are replaced with malicious code. Only in this “test” world are these changes visible; the rest of the system still sees the original file.
3. Launching the infected process
The modified (within the transaction) file is used to launch a new process. The system loads the malicious code into memory, but… the file on disk remains unaltered!
4. Erasing traces of the operation
The transaction is canceled or closed, so the physical .exe file on the disk is never “permanently” replaced – and all traces of changes disappear.
5. The malicious process runs undercover
The new process, with the hidden malicious code, runs under the name of a legitimate program. Such activity is virtually invisible to administrators or antivirus programs.
Why is this so dangerous?
- No files on disk – Antiviruses have nothing to scan!
- Signature system bypass – Traditional protections won’t detect activity because … no suspicious file is created.
- Masquerades as legitimate programs – An infected process can disguise itself as a well-known application like Word, lulling administrators and monitoring tools into a false sense of security.
- Works on various versions of Windows – As long as the system supports NTFS transactional features.
Practical applications and risks
Cybercriminals use Process Doppelgänging to run ransomware, trojans, or “invisible” tools for data theft. Traditional security measures are nearly powerless against this method, making rapid identification and neutralization of the threat extremely difficult. The result can be the theft of confidential data, takeover of a system, or prolonged corporate espionage – all without the victim ever being aware.
How to defend yourself? Choose modern protection!
- Detect unusual process launches – Use tools that analyze anomalies, such as Sycope, which detects suspicious fileless activity in real time.
- Monitor NTFS (TxF) transaction usage – SIEM and EDR class tools can track unusual file operations that ordinary programs rarely perform.
- Invest in advanced endpoint and network protection – EDR and NDR solutions will quickly expose strange behavior in systems and help identify new threats.
- Regularly update your system – Make sure Windows is free of vulnerabilities, and disable unused features (like TxF).
- Train users and administrators – Knowledge is the best shield against modern fileless cyberattacks! Platforms like Sycope provide incident analysis and educational summaries of threat trends.
Process Doppelgänging is proof that cyber threats are constantly evolving. By investing in modern solutions and education, you can effectively stand in the way of even the most sophisticated attacks!
