PWS:Win32/Frethog is a large family of password-stealing trojans that target confidential data, such as account information, from Massive Multiplayer Online Games (such as World of Warcraft, for example).
Win32/Frethog is a large family and variants may install themselves using different file paths and file names.
When executed, Win32/Frethog drops a dll with a randomly generated file name and injects it into explorer.exe.
The dropper may then modify the following registry entries in order to execute itself at each Windows start:
Modifies System Security Settings
The dropper attempts to circumvent security products by:
- Attempting to prevent AVP Antivirus from displaying notifications regarding system changes by closing windows used by this product.
- Attempting to terminate Ravmon.exe if it is found to be running on the affected system.
Steals Online Game Data
The dll, once injected, can obtain account information for one or more of the following Massively Multiplayer Online Games and affiliated products:
A Chinese Odyssey
Hao Fang Battle Net
Legend of Mir
World Of Warcraft
The captured details are sent to a remote server.
Analysis by Matt McCormack
There are no obvious symptoms that indicate the presence of this trojan on an affected system.