Threat Description

Packed:​W32/Tibs.GU

Details

Aliases:Packed:​W32/Tibs.GU
Category:Malware
Type:Email-Worm
Platform:W32

Summary



Files that are detected as Packed.Win32.Tibs.gu have similar functionality to Email-Worm.Win32.Zhelatin variants.



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



Upon execution, the following are the changes made to the system:

File System Changes

It creates the following files:

  • %windir%\disnisa.exe
  • %windir%\disnisa.config

Registry Modifications

It sets the values below:

  • HKLU\Software\Microsoft\Windows\CurrentVersion\Run disnisa = C:\WINDOWS\disnisa.exe
  • HKLM\System\CurrentControlSet\Services\W32Time\Parameters NtpServer = time.windows.com,time.nist.gov
  • HKLM\System\CurrentControlSet\Services\W32Time\Parameters Type = NTP
  • HKLM\Software\Microsoft\Tracing\FWCFG EnableFileTracing = 00000000
  • HKLM\Software\Microsoft\Tracing\FWCFG EnableConsoleTracing = 00000000
  • HKLM\Software\Microsoft\Tracing\FWCFG FileTracingMask = FFFF0000
  • HKLM\Software\Microsoft\Tracing\FWCFG ConsoleTracingMask = FFFF0000
  • HKLM\Software\Microsoft\Tracing\FWCFG MaxFileSize = 00100000
  • HKLM\Software\Microsoft\Tracing\FWCFG FileDirectory = %windir%\tracing
  • HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List C:\WINDOWS\disnisa.exe = C:\WINDOWS\disinia.exe:*:Enabled:enable

A text file, disnisa.config, is dropped which contains a possible lists of clients for the worm's peer-to-peer network. The details for the peer names and access ports are encoded.Another noticeable characteristic for this malware is that it tries to connect to a good number of predefined IP addresses using User Datagram Protocol (UDP).Furthermore, the files that are detected as Packed.Win32.Tibs.gu are usually downloaded as the result of clicking links from heavily spammed e-mails and websites.






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