Threat Description

Virus: W32/Alman.A

Details

Category: Malware
Type: Net-Worm
Platform: W32
Aliases: PE_CORELINK.A, Virus.Win32.Alman.a, W32/Almanahe.A, Win32.almanahe.d

Summary


Virus:W32/Alman.A infects all executable files in the system. The virus propagates over a network. It also has rootkit capabilities and is capable of contacting a remote server to forward information about the infected system.



Removal


Automatic action

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

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


A later variant of this virus, Virus:W32/Alman.B, is also in the wild.

Variants of this family may be detected by the Generic Detection, Virus:W32/Alman.gen!A.

Infection

Alman.A infects all .EXE files in the affected system. It appends its code to the target file and sets this as an additional code section. It searches for files to infect in all fixed, shared, and removable drives.

It skips infecting files located in the following directories:

  • Local Settings\Temp
  • Windows
  • WinNT

It also skips infecting files matching the following names:

  • ó»°Î÷ÓÎ.exe
  • 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
Execution

Upon execution, this network-propagating virus drops the following files:

  • [Windows Directory]\linkinfo.dll - infector component
  • [Windows System Directory]\drivers\DKIS6.sys - rootkit component
  • [Windows System Directory]\drivers\RioDrvs.sys - rootkit component

The dropped file RioDrvs.sys is registered as a service.The file linkinfo.dll is injected into explorer.exe and is hidden by the rootkit components.

This virus terminates processes with names that match the following strings:

  • c0nime.exe
  • cmdbcs.exe
  • ctmontv.exe
  • explorer.exe
  • fuckjacks.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

However, the path of the files associated with the above mentioned processes should not contain the following strings:

  • \com\
  • \program files\
  • \system\
  • \windows\
  • \winnt\

Once the process is terminated, the corresponding file is also deleted.

Propagation

The virus accesses network shares using the Administrator account name and one of the following passwords:

  • !@#$
  • !@#$%
  • !@#$%^
  • !@#$%^&
  • !@#$%^&*
  • !@#$%^&*(
  • !@#$%^&*()
  • 1
  • 111
  • 123
  • 1234
  • 12345
  • 123456
  • 654321
  • admin
  • asdf
  • asdfgh
  • qaz
  • qazwsx
  • qwer
  • zxcv

Once connected, it drops a copy of itself as C$\Ins.exe. The dropped file is executed as a service with the service name DLAN.

This virus will attempt to connect to the following site to update itself or send data regarding the infected system:

  • http://tj.imrw0rldwide.com/[...].asp
Process Changes

Creates these mutexes:

  • __DL5EX__
  • __DL_CORE_MUTEX__
  • ACPI#PNP0D0D#1#Amd_DL5
Registry Modifications

Creates these keys:

  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RioDrvs DisplayName = "RioDrvs Usb Driver" ImagePath = "system32\Drivers\RioDrvs.sys"




Description Created: 2007-04-18 01:43:53.0

Description Last Modified: 2010-07-13 05:38:21.0


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