BKDR_KORPLG.ILP

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. It may be downloaded by other malware/grayware from remote sites.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

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.

It may be downloaded by the following malware/grayware from remote sites:

• JS_NISEILY.AB

It may be downloaded from the following remote site(s):

• http://downfile2.{BLOCKED}arecenter.com/virtual/news/mm.exe

Installation

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

• %All Users Profile%\taskeng.exe

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• QF-2-0-33

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
taskeng = "%All Users Profile%\taskeng.exe"

Other System Modifications

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LOG
CLSID = "{hex values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LOG

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LOGPROXY

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• download arbitrary files
• perform remote shell commands
• get system information
• create directories

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://kitamura.{BLOCKED}arecenter.com/{8 random hex values}FFFFFFFF.aspx

Information Theft

This backdoor gathers the following data:

• computer name
• user name
• drive information
• os version

NOTES:
This backdoor disables the firewall by executing in command prompt the line net stop SharedAccess.

It will only perform its malicious routine if the current year is 2013 and above.

It does not have rootkit capabilities.

It does not exploit any vulnerability.