BKDR_NETSNAKE.H

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 drops the following copies of itself into the affected system and executes them:

• %System%\iexplore.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It drops the following files:

• %System%\psitnthk.dll

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
mssysint = "iexplore.exe"

Other System Modifications

This backdoor adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\Software\Classes\
ZSnSn
dwUpgrade = "{random values}"

It adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\Software\Classes\
ZSnSn

Other Details

This backdoor connects to the following possibly malicious URL:

• http://web.{BLOCKED}a.net/download/power001.snk
• pop3.{BLOCKED}a.com.cn
• pop.163.idns.{BLOCKED}h.net
• http://www.{BLOCKED}0.com/mima/zhuangbei/query.php