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Home Alerts

Meterpreter Uses Image Steganography

May 30, 2024
Reading Time: 3 mins read
in Alerts
Meterpreter Uses Image Steganography

A recent analysis by ANY.RUN sandbox has uncovered a new strain of Meterpreter backdoor malware that employs advanced steganography techniques to conceal its malicious payload within an image file. This malware, known as “Meterpreter Backdoor,” embeds its code in the first two rows of an image, using only the green and blue color channels from the RGB color space to avoid detection. The attack initiates with a .NET executable file that runs a PowerShell script, which downloads a seemingly innocuous PNG image from a remote command-and-control server. Despite its appearance as a simple landscape, this image hides a dangerous secret.

The malware extracts a byte array from the image channels using the System.Drawing library and a specific formula to uncover the hidden code. Once the byte array is obtained, it is decoded into ASCII characters, revealing critical information such as a User-Agent string and the IP address of the command-and-control server. This information is then converted into a script that the malware executes, establishing a persistent backdoor on the infected machine. This backdoor enables various malicious activities, including data exfiltration, remote code execution, and further spreading of the malware within the network.

Steganography, the technique of hiding information within seemingly benign data, has become increasingly popular among cybercriminals due to its ability to bypass traditional security measures. By embedding malicious code within images, audio files, or other multimedia content, attackers can effectively cloak their activities and deliver their payloads undetected. The Meterpreter Backdoor campaign demonstrates the sophistication and adaptability of modern malware authors, highlighting the ongoing challenge for cybersecurity professionals to identify and mitigate such threats.

In response to these evolving threats, cybersecurity experts emphasize the need for a multi-layered security approach. This should combine traditional signature-based detection with advanced techniques such as behavioral analysis and machine learning. Constant vigilance and a proactive approach to cybersecurity are essential to stay ahead of these ever-evolving threats. Organizations and individuals must prioritize best practices, including keeping software up-to-date, implementing robust access controls, and educating users on recognizing and reporting suspicious activities. The Meterpreter Backdoor campaign serves as a stark reminder of the importance of these measures in protecting against sophisticated cyber-attacks.

Reference:

  • New Meterpreter Backdoor Hides Malicious Code in Images Using Steganography

Tags: ANY.RUNCyber AlertCyber Alerts 2024Cyber RiskCyber threatMay 2024MeterpreterMeterpreter backdoorPayloadSteganography
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