Summary
Virus:W32/Alman.B infects all executable files in the system. The virus propagates over a network. It also has rootkit capabilities.
Removal
Alman.B is a network virus/worm with rootkit features, so it requires specific disinfection instructions:
- Stop all network sharing or completely disconnect from the network
- Set disinfection action for real-time scanner to "Disinfect Automatically"
- Perform a full computer scan with F-Secure Anti-Virus
- Select "Disinfect" action for all infected files
- Files that can not be disinfected should be quarantined or deleted (select appropriate action manually)
- Files dropped by the virus: "linkinfo.dll", "nvmini.sys" and "IsDrv118.sys" should be deleted or quarantined
- Broken infected files should be restored from a backup
- After disinfection restart a computer
- After restart perform a full scan again to make sure that no infection is left
- Enable sharing or reconnect the network ONLY after ALL computers are disinfected, otherwise a single infected workstation can re-infect the whole network
- Make sure that all network shares have strong passwords
- After disinfection set the default disinfection action for real-time scanner to "Ask After Scan" if needed
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
- Check for the latest database updatesFirst, check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sampleAfter checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
- Exclude a file from further scanningIf you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.Note: You need administrative rights to change the settings.
Technical Details
An earlier variant of this virus, Virus:W32/Alman.A, is also in the wild.
Variants of this family may be detected by the Generic Detection, Virus:W32/Alman.gen!A.
Infection
The virus infects EXE files that are not protected by Windows System File Check on local, removable, and remote drives. The virus does not infect files with these names:
- asktao.exe
- au_unins_web.exe
- audition.exe
- autoupdate.exe
- ca.exe
- cabal.exe
- cabalmain.exe
- cabalmain9x.exe
- config.exe
- dbfsupdate.exe
- dk2.exe
- dragonraja.exe
- flyff.exe
- game.exe
- gc.exe
- hs.exe
- kartrider.exe
- main.exe
- maplestory.exe
- meteor.exe
- mhclient-connect.exe
- mjonline.exe
- mts.exe
- nbt-dragonraja2006.exe
- neuz.exe
- nmcosrv.exe
- nmservice.exe
- nsstarter.exe
- patcher.exe
- patchupdate.exe
- sealspeed.exe
- trojankiller.exe
- userpic.exe
- wb-service.exe
- woool.exe
- wooolcfg.exe
- xlqy2.exe
- xy2.exe
- xy2player.exe
- zfs.exe
- zhengtu.exe
- ztconfig.exe
- zuonline.exe
The virus also doesn't infect files located in the following folders:
- \LOCAL SETTINGS\TEMP\
- \WINDOWS\
- \WINNT\
Payload
After the infected file is started the virus decrypts its body and drops two files:
- %WinDir%\linkinfo.dll
- %WinSysDir%\drivers\IsDrv118.sys
The DLL is the main virus component. The SYS file is a rootkit component that hides certain files and Registry keys.
The dropped DLL file is injected into Windows Explorer process and runs with system privileges.
The virus terminates the following processes:
- c0nime.exe
- cmdbcs.exe
- ctmontv.exe
- explorer.exe
- fuckjacks.exe
- iexpl0re.exe
- iexpl0re.exe
- iexplore.exe
- internat.exe
- logo_1.exe
- logo1_.exe
- lsass.exe
- lying.exe
- msdccrt.exe
- msvce32.exe
- ncscv32.exe
- nvscv32.exe
- realschd.exe
- rpcs.exe
- run1132.exe
- rundl132.exe
- smss.exe
- spo0lsv.exe
- spoclsv.exe
- ssopure.exe
- svch0st.exe
- svhost32.exe
- sxs.exe
- sysbmw.exe
- sysload3.exe
- tempicon.exe
- upxdnd.exe
- wdfmgr32.exe
- wsvbs.exe
If the files that belong to terminated processes are located in specific folders, they are deleted.
Propagation
To spread in a network the virus tries to connect to the IPC$ share with login "Administrator" and performs a dictionary attack on the admin password using these values:
- admin
- aaa
- !@#$
- asdf
- asdfgh
- !@#$%
- !@#$%^
- !@#$%^&
- !@#$%^&*
- !@#$%^&*(
- !@#$%^&*()
- qwer
- admin123
- love
- test123
- owner
- mypass123
- root
- letmein
- qwerty
- abc123
- password
- monkey
- password1
- 1
- 111
- 123
- 12345
- 654321
- 123456789
If connection is successful, the virus copies itself as "Setup.exe" file to the root of the system drive and starts the copied file as a service.
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