Threat Description

Virus:​W32/Alman.A

Details

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

Summary



A program that secretly and maliciously integrates itself into program or data files. It spreads by integrating itself into more files each time the host program is run.



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 may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



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.

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"





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