JS/Nemucod.CXD!tr

Analysis

JS/Nemucod.CXD!tr is a generic detection for a type of Javascript downloader trojan that downloads and runs the Kovter malware on the compromised computer. Since this is a generic detection, files that are detected as JS/Nemucod.CXD!tr may have varying behavior.
Below are examples of some of these behavior:

• It attempts to connect and download a file from following URL:
  
  • hxxp://blo{Removed}.com/wp-content/uploads/2017/03/counter/exe1.exe
  If successful, the file is saved to the Temporary folder as exe1.exe. At the time of this analysis, this file can be detected as W32/Kryptik.FROQ!tr.

Recommended Action

• Make sure that your FortiGate/FortiClient system is using the latest AV database.
• Quarantine/delete files that are detected and replace infected files with clean backup copies.