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 Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



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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