BKDR_KULUOZ.XTRO

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.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %AppDataLocal%\{random filename}.exe "

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\{random characters}
{random characters} = "{hex values}"

Dropping Routine

This backdoor drops the following files:

• %AppDataLocal%\{random filename}.exe

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

Other Details

This backdoor connects to the following possibly malicious URL:

• http://{BLOCKED}.{BLOCKED}.29.205
• http://{BLOCKED}.{BLOCKED}.246.188
• http://{BLOCKED}.{BLOCKED}.1.189
• http://{BLOCKED}.{BLOCKED}.59.5
• http://{BLOCKED};{BLOCKED}.157.126
• http://{BLOCKED}.{BLOCKED}.114.64