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You have been re-routed to the Trojan:Win32/Chebri.B write up because Trojan%3aWin32%2fChebri.B has been renamed to Trojan:Win32/Chebri.B
 

Trojan:Win32/Chebri.B


Trojan:Win32/Chebri.B is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Threat behavior

Trojan:Win32/Chebri.B is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.
Installation
When executed, Trojan:Win32/Chebri.B copies itself to c:\documents and settings\administrator\application data\regsrv64.exe.

The malware modifies the following registry entries to ensure that its copy executes at each Windows start:

Adds value: "Microsoft DLL Registration"
With data: "c:\documents and settings\administrator\application data\regsrv64.exe"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run
Payload
Contacts remote host
Trojan:Win32/Chebri.B may contact a remote host at 29779519131121219.com using port 20001. Commonly, malware may contact a remote host for the following purposes:
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 7b8eea276cfad0cd2629ff243fd19f96f9f5366e.

Symptoms

System changes
The following system changes may indicate the presence of this malware:

  • The presence of the following files:

  • c:\documents and settings\administrator\application data\regsrv64.exe

  • The presence of the following registry modifications:
  • Adds value: "Microsoft DLL Registration"
    With data: "c:\documents and settings\administrator\application data\regsrv64.exe"
    To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run


Prevention


Alert level: Severe
First detected by definition: 1.115.2739.0
Latest detected by definition: 1.185.3462.0 and higher
First detected on: Nov 28, 2011
This entry was first published on: Dec 14, 2011
This entry was updated on: Dec 15, 2011

This threat is also detected as:
No known aliases