Monday, March 4, 2024

DePriMon Malware Registers Itself as Windows Default Print Monitor To Execute Commands With SYSTEM Privileges

A new malicious downloader dubbed “DePriMon” registers itself as fake Windows Default Print Monitor to achieve persistence and to execute commands as a SYSTEM user.

The DePriMon malware found to be active at least from March 2017, it was detected first in a private company based in Central Europe. It is well-written malware and the malware authors use various encryption techniques which make the analysis more difficult.

DePriMon Malware

According to ESET analysis, the malware is multi-staged, the first stage and the distribution method of the malware remain unknown at the time of writing.

The second stage of the malware loads the third stage of the malware downloader using an encrypted, hardcoded path. The second stage of the malware registers the third-stage DLL as a port monitor.

The port monitor is a DLL that registers itself under SYSTEM level permissions as a printer. It performs various tasks such as printing a document or saving the PDF file.

The second stage registers the third-stage DLL with the following registry key and value

HKLM\SYSTEM\CurrentControlSet\Control\Print\Monitors\Windows Default Print Monitor
Driver = %PathToThirdStageDLL%

This registered DLL loaded by spoolsv[.]exe and executed with SYSTEM privileges at the time of system startup. It also checks the file in %system32% that the file name is the same as the third stage DLL.

Third stage malware is responsible for downloading the main payload from DePriMon’s operators. Communication with C&C server established through SSL/TLS, Secure Channel.

For making the analysis difficult the malware authors store the encrypted configuration file in a temporary folder.


DePriMon gets downloaded to memory and executed directly by using the DLL loading technique and it never stores on the disk. It is a powerful and persistent tool used to download other malware.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity and hacking news updates.


Latest articles

New Silver SAML Attack Let Attackers Forge Any SAML Response To Entra ID

SolarWinds cyberattack was one of the largest attacks of the century in which attackers...

AI Worm Developed by Researchers Spreads Automatically Between AI Agents

Researchers have developed what they claim to be one of the first generative AI...

20 Million+ Cutout.Pro User Records Leaked On Hacking Forums

CutOut.Pro, an AI-powered photo and video editing platform, has reportedly suffered a data breach,...

CWE Version 4.14 Released: What’s New!

The Common Weakness Enumeration (CWE) project, a cornerstone in the cybersecurity landscape, has unveiled...

RisePro Stealer Attacks Windows Users Steals Sensitive Data

A new wave of cyber threats has emerged as the RisePro information stealer targets...

Golden Corral Restaurant Chain Hacked: 180,000+ Users’ Data Stolen

The Golden Corral Corporation, a popular American restaurant chain, has suffered a significant data...

CISA Warns Of Hackers Exploiting Multiple Flaws In Ivanti VPN

Threat actors target and abuse VPN flaws because VPNs are often used to secure...
Guru baran
Guru baran
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.

Live Account Takeover Attack Simulation

Live Account Take Over Attack

Live Webinar on How do hackers bypass 2FA ,Detecting ATO attacks, A demo of credential stuffing, brute force and session jacking-based ATO attacks, Identifying attacks with behaviour-based analysis and Building custom protection for applications and APIs.

Related Articles