Threat Actors Leveraging Microsoft Graph API for C2 Communications

2025-02-13

Threat actors have recently been using the Microsoft Graph API for command and control (C2) communications. Elastic Security Labs uncovered a campaign detailed in the article “You’ve Got Malware: FINALDRAFT Hides in Your Drafts” (https://lnkd.in/gETHijA9), which targeted a foreign ministry. The malware involved in this campaign includes a tailored loader and backdoor equipped with various features, such as leveraging Microsoft’s Graph API for C2 communications.

Key Features of the Malware:

1. Tailored Loader: The malware uses a custom loader to execute its payload.
2. Backdoor Functionality: The backdoor allows remote access and control over the infected system.
3. Microsoft Graph API: The malware leverages Microsoft’s Graph API for C2 communications, making it harder to detect.

Practice-Verified Commands and Codes:

Detecting Suspicious API Calls:

<h1>Monitor API calls using Sysmon</h1>

sudo sysmon -accepteula -i sysmonconfig.xml

<h1>Check for unusual network connections</h1>

netstat -anp | grep ESTABLISHED

Analyzing Malware with Linux Tools:

<h1>Use Volatility for memory analysis</h1>

volatility -f memory.dump --profile=Win10x64 pslist

<h1>Check for suspicious processes</h1>

ps aux | grep -i 'microsoft.graph'

Windows Command for Network Monitoring:

<h1>Monitor network activity using PowerShell</h1>

Get-NetTCPConnection | Where-Object {$_.State -eq "Established"} | Format-Table -AutoSize

Blocking Suspicious IPs:

<h1>Block IPs using iptables</h1>

sudo iptables -A INPUT -s <suspicious_ip> -j DROP

What Undercode Say:

The use of Microsoft Graph API by threat actors for C2 communications highlights the evolving sophistication of cyber threats. This campaign underscores the importance of monitoring API usage and network traffic for unusual patterns. Tools like Sysmon, Volatility, and PowerShell can be invaluable in detecting and analyzing such threats. Additionally, blocking suspicious IPs and monitoring established connections can help mitigate risks. For further reading on securing APIs and detecting advanced malware, refer to the following resources:
– Microsoft Graph API Documentation
– Elastic Security Labs Report

In conclusion, staying vigilant and leveraging the right tools and commands can significantly enhance your cybersecurity posture. Regularly updating your knowledge and skills in IT and cybersecurity is crucial in this ever-evolving landscape.

References:

Hackers Feeds, Undercode AI