BKDR_AGENT.IGL

This backdoor 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 backdoor 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 backdoor creates the following folders:

• %System Root%\DOCUME~1
• %System Root%\DOCUME~1\ADMINI~1
• %User Profile%\LOCALS~1
• %User Temp%\nsi3.tmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.)

Other System Modifications

This backdoor deletes the following files:

• %User Temp%\nss1.tmp
• %User Temp%\nsi3.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.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0150E15B-3020-4e25-94EC-41E5818C5D52}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0150E15B-3020-4e25-94EC-41E5818C5D52}
fid = "2434"

Dropping Routine

This backdoor drops the following files:

• %User Temp%\nsi2.tmp
• %User Temp%\nsi3.tmp\System.dll
• %Program Files%\Messenger\08.exe
• %Program Files%\Messenger\ntoskrnl.exe

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

This report is generated via an automated analysis system.