WORM_NGRBOT.AU

This worm 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 worm 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 worm drops the following copies of itself into the affected system:

• %User Profile%\Application Data\Zbigif.exe

(Note: %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.)

It creates the following folders:

• %User Profile%\Application Data\VMware
• %User Profile%\Microsoft\Dr Watson
• %System Root%\Documents and Settings
• %System Root%\Documents and Settings\Administrator
• %Start Menu%\Programs
• %User Profile%\Application Data
• %User Profile%\Application Data\kakao3

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Zbigif = "%User Profile%\Application Data\Zbigif.exe"

Other System Modifications

This worm deletes the following files:

• %User Profile%\Application Data\1.tmp
• %User Profile%\Application Data\2.tmp

(Note: %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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR SFX

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR SFX
C%%Documents and Settings%Administrator%Start Menu%Programs%Startup = "%User Startup%"

HKEY_CURRENT_USER\Software\WinRAR SFX
C%%Documents and Settings%Administrator%Application Data%kakao3 = {random characters}

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DrWatson
NumberOfCrashes = 1

(Note: The default value data of the said registry entry is 0.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting\DW

Dropping Routine

This worm drops the following files:

• %User Profile%\Application Data\1.exe
• %User Profile%\Application Data\2.exe
• %User Profile%\Application Data\3.tmp
• %User Profile%\Dr Watson\drwtsn32.log
• %User Profile%\Dr Watson\user.dmp
• __tmp_rar_sfx_access_check_74781
• newmoon17.exe
• __tmp_rar_sfx_access_check_77875
• fuckHDZSDP.exe
• new.exe

(Note: %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.)

Other Details

This worm connects to the following possibly malicious URL:

• http://api.{BLOCKED}ia.com/
• http://img105.{BLOCKED}h.com/2011/11/11/751748664.gif
• http://img103.{BLOCKED}h.com/2011/11/14/477334673.gif
• http://img103.{BLOCKED}h.com/2011/11/14/955459483.gif

This report is generated via an automated analysis system.