W32/Emogen.Y!tr

Analysis

W32/Emogen.Y!tr is a generic detection for a type of trojan that uses a polymorphic custom packer. Since this is a generic detection, malware that are detected as W32/Emogen.Y!tr may have varying behavior.

• Some examples of malware that use this packer are the following:
  
  • ransomware
  • downloader


• This malware may also have the capability to connect to external servers. One sample has been observed to open a Microsoft Internet Explorer Window with the address pointing to www.1a2a3a.cn.


• Some samples are also observed to drop files in folders such as undefinedAllUsersProfileundefined\Application Data  or undefinedProgramFilesundefined.

Recommended Action

FortiGate Systems

• Check the main screen using the web interface for your FortiGate unit to ensure that the latest AV/NIDS database has been downloaded and installed on your system - if required, enable the "Allow Push Update" option.

• Quarantine/delete files that are detected and replace infected files with clean backup copies.