Tenga.A

Classification

Category:

Malware

Platform:

W32

Type:

Virus

Aliases:

Tenga.A

Summary

Tenga.A is a virus that infects files by appending itself to each Windows executable file it finds. The virus also has the ability to scan the network and infect files found in open network shares.

Removal

Technical Details

Tenga.A infects files by appending itself to each Windows executable file it finds. The virus also has the ability to scan the network and infect files found in open network shares.

Upon execution, it connects to and tries to download and execute http://utenti.lycos.it/[***]/dl.exe. It also connects to http://[***].users.freebsd.at and opens a remote command shell on the affected machine on port 54321.

The virus uses CRC matching to search for the required APIs it needs to do its malicious tasks. It avoids infecting ntoskrnl.exe and marks each infected executable files with the character `V´ in the old DOS stub header. The marking of the infected files prevents re-infection attempts

Tenga.A also elevates its privileges and disables Windows File Protection. To check if an instance of itself is already running, the virus creates a mutex named gaelicum.