DEMTRANC

DEMTRANC is a typical botnet that targets Windows-based machines. It has downloading capabilities and remote shell command used to distribute other malware. Most samples arrive via exploited Flash file (.SWF) and .PDF files.

Installation

This backdoor drops the following files:

• %Application Data%\Microsoft\plugin_containor.exe
• %Application Data%\Help\iexplore.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

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
Plugin Container = "%Application Data%\Microsoft\plugin_containor.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
iexplore = "%Application Data%\Help\iexplore.exe"

Other Details

This backdoor connects to the following possibly malicious URL:

• {BLOCKED}.{BLOCKED}.131.201/{3 Letter Header}{value}O{value}.jsp?{value}
• flying.{BLOCKED}1.us/{3 Letter Header}{value}O{value}.jsp?{value}
• kiki.{BLOCKED}S.biz/{3 Letter Header}{value}O{value}.jsp?{value}
• koranws.{BLOCKED}h.com/{3 Letter Header}{value}O{value}.jsp?{value}
• wwvv.{BLOCKED}dns.org.uk/{3 Letter Header}{value}O{value}.jsp?{value}