TROJ_QHOST.AJV

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan creates the following folders:

• %User Temp%\1.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This Trojan modifies the following file(s):

• %System%\dRIvERS\Etc\HOStS

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It deletes the following files:

• %User Temp%\1.tmp
• %Temp%\PEC4D6~1.DAT
• %Temp%\PERFLI~1.DAT
• %Temp%\PERFLI~3.DAT
• %Temp%\PERFLI~2.DAT
• %System%\dRIvERS\Etc\hosts

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
SERvERINFOtIMEOut = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
DNScacHEtIMEOut = "0"

Dropping Routine

This Trojan drops the following files:

• %System%\dRIvERS\Etc\HOStS.iCs

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.