TSPY_ZBOT.IAY

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

It deletes itself after execution.

Arrival Details

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

• %User Profile%\nah_rndx.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

(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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
nah_Shell = "%User Profile%\nah_rndx.exe"

Other System Modifications

This spyware deletes the following files:

• %User Profile%\nah_cookies.txt

(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 entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
nah_id = "8635620662"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
nah_options = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
nah_id = "1584428436"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
nah_id = "1285759840"

Other Details

This spyware deletes itself after execution.

This report is generated via an automated analysis system.