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You have been re-routed to the Trojan:Win32/Lethic.H write up because Trojan%3aWin32%2fLethic.H has been renamed to Trojan:Win32/Lethic.H
 

Trojan:Win32/Lethic.H


Trojan:Win32/Lethic.H 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/Lethic.H 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/Lethic.H copies itself to c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe.

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

Adds value: "Tnaww"
With data: "c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run

Adds value: "Taskman"
With data: "c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

The malware creates the following files on an affected computer:

  • c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\desktop.ini

The malware utilizes code injection in order to hinder detection and removal. When Trojan:Win32/Lethic.H executes, it may inject code into running processes, including the following, for example:

  • explorer.exe

Payload
Contacts remote host
Trojan:Win32/Lethic.H may contact a remote host at dq.javagames7.com using port 8800. 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 eba2ea05b2d6a7417983e0cfb29e416679812828.

Symptoms

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

  • The presence of the following files:

  • c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\desktop.ini
    c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe

  • The presence of the following registry modifications:
  • Adds value: "Tnaww"
    With data: "c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe"
    To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run

    Adds value: "Taskman"
    With data: "c:\recycler\s-1-5-21-0243556031-888888379-781863308-1413\syitm.exe"
    To subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon


Prevention


Alert level: Severe
First detected by definition: 1.107.1353.0
Latest detected by definition: 1.189.811.0 and higher
First detected on: Jul 08, 2011
This entry was first published on: Jul 26, 2011
This entry was updated on: Jul 26, 2011

This threat is also detected as:
No known aliases