WORM_OPASERV.T
This memory-resident worm a member of the OPASERV family of worms, spreads via shared network drives.
Its destructive payloads are executed when the system date is between December 24 to 31 or when the year is greater than 2002.
This worm deletes files, overwrites the boot sector and destroys the CMOS.
It also modifies the registry and the configuration file, WIN.INI, so that it automatically executes every Windows startup.
It uses a known exploit that enables malicious users to access shared drives, as discussed in a security bulletin from Microsoft.
Removing autostart entries from the registry prevents the malware from executing during startup:
HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>CurrentVersion>Run
IASHLPR="%Windows%\IASHLPR.EXE"
FONTVIEW="%Windows%\FONTVIEW.EXE"
MPREXE="%Windows%\MPREXE.EXE"
Scr="%System\scr.scr"
BIOS1="%Windows%\BIOS1.EXE"
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run,
Winsrv=%Windows%\winsrv.exe
CLICONFG="%Windows%\CLICONFG.EXE"
HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>CurrentVersion>RunServices
LoadManager="%Windows%\msload.exe"
ACTIVEDS="%Windows%\ACTIVEDS.EXE"
Use RegRun to automatically remove these registry items.
Removal: ACTIVEDS.EXE is removed by RegRun.
Read more... Removal instructions...
Recommended software:
UnHackMe - easy removal Rootkits/Adware/Spyware.
http://www.unhackme.com
RegRun Security Suite - removal and protection.
http://www.regrun.com
RegRun Reanimator - free removal tool.
greatis.com/reanimator
RegRun - User's Choice
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