Severity

High

Analysis Summary

The Iranian nation-state threat group has been actively targeting middle-eastern and US organizations. The group gets the name “TunnelVision” because of their heavy reliance on tunneling tools. The threat actor uses Log4j exploit to deploy ransomware and FPRC (Fast Reverse Proxy Client). They run PowerShell commands on infected systems by exploiting the Log4j vulnerability in VMware software. Legitimate public services that the group uses (and outbound connections to look out for) are:

• transfer.sh
• pastebin.com
• webhook.site
• ufile.io
• raw.githubusercontent.com

Some vendors suggest that the attributes of TunnelVision and Phosphorus are similar and therefore they must be linked, however, current data is insufficient to confirm this theory

Impact

• Exposure of Sensitive Data
• Remote Code Execution
• Gain Access
• Cyber Espionage
• Data Theft

Indicators of Compromise

Domain Name

• www[.]microsoft-updateserver[.]cf
• www[.]service-management[.]tk

IP

• 51[.]89[.]169[.]198
• 142[.]44[.]251[.]77
• 51[.]89[.]135[.]142
• 51[.]89[.]190[.]128
• 51[.]89[.]178[.]210
• 142[.]44[.]135[.]86
• 182[.]54[.]217[.]2

Remediation

• Always be suspicious about emails sent by unknown senders.
• Never click on links/attachments sent by unknown senders.
• Block all threat indicators at your respective controls.
• Search for IOCs in your environment.