WORM_QAKBOT.BV

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 files:

• %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.dll - detected as TROJ_QAKBOT.BT

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following copies of itself into the affected system:

• %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

• %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{legitimate application} = "%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random characters}\{random characters}.exe" /c {path and file name of legitimate application}

(Note: The default value data of the said registry entry is {path and file name of legitimate application}.)