Rewterz Threat Alert – Njrat Targeting Yemen – Active IOCs

Severity

High

Analysis Summary

NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple versions of the secondary payload used, ranging from base64 encoded version, hexadecimal, JSON data format, compressed blobs, and also plain text data with malicious URLs embedded within. This is done in order to evade detection by security products and increase the possibility of operating unnoticed. njRat is developed in .NET framework and is able to hijack the functions of a compromised machine remotely, including taking screenshots, exfiltrating data, keylogging, and killing processes such as antivirus programs, while also connecting the machine to a botnet. RAT was also found abusing Windows API functions such as Windows API calls such as GetKeyboardState(), GetAsynckeyState(), MapVirtualKey() for keylogging, and data theft. It was also discovered downloading web scraping tools such as “proxy scrapper” in order to extract large amounts of data via proxies.

NjRat was seen targeting Yemen in its latest campaign with the file “وثائق مسربة مهمة لجماعة الحوثي”

(Important leaked documents of the Houthi group)

Impact

• Unauthorized Access

Indicators of Compromise

Domain Name

ya20q23.duckdns.org

MD5

• 934a58c76545d8efa2730cd82a3e1c1d
• 5adb7ae3e77e59f44da402434ae86ef8

SHA-256

• fb21d27c599da731bb061caeba5edab7a6228e4743c30bf856965422dd3f8f79
• f19fa496adfdf43af3b6c66bf2f83a0b62ce14f32b710d708dfc4b10bd8fc752

SHA-1

• a82a847b7624533a69b4bc2670c917483a354516
• fa5f9ae45e6b342c8d5c4cff5bbd63a53ca37e37

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.