Threat Description

Virus:​W32/Drowor.A

Details

Category:Malware
Type:Virus
Platform:W32

Summary



Drowor.A is a Windows file appending virus that infects executables in all drives found including network drives.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



Drowor.A is a Windows file appending virus that infects executables in all drives found including network drives.Upon execution, this virus checks to see if it is already running in memory by elevating its privileges and enumerating currently running processes on the affected machine.It then creates and executes a copy of itself as:

  • %windows%\system\internat.exe.

It drops a hidden copy of itself, setup.exe, in the root directory of discovered drives. This includes network drives. It creates an autorun.inf alongside of this setup.exe that may trigger and execute the file. It Infects by appending itself in Windows executables, adding a section named ".ice" in the infected files.Drowor.A creates a text file list of Windows executables in the discovered drives to a hard-coded path:

  • C:\WINDOWS\win.log

Drowor.A attempts to accesses a file from:

  • http://mm.21380.com/[Removed].txt

The URL is currently unavailable.



Detection



Database: 2007-03-11_01
Detection Type: PC F-Secure Anti-Virus detects this malware with the following updates:
Detection Type: PC
Database: 2007-03-11_01




SUBMIT A SAMPLE

Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More