WORM_HARAKIT.S

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.

It deletes itself after execution.

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 copies of itself into the affected system and executes them:

• %System%\csrcs.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:

• {drive letter}\jiyt
• %User Temp%\aut{random number}.tmp
• %User Temp%\{random char}
• %User Temp%\suicide.bat
• %System%\autorun.inf

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

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

HKLM\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
csrcs = %System%\csrcs.exe

Other Details

This worm connects to the following possibly malicious URL:

• eet.{BLOCKED}su.com:5300/po.php
• eet.{BLOCKED}su.com:5300/banner.gif
• juytolp.{BLOCKED}e.hm:5400/banner.gif
• kiu.{BLOCKED}atama.com:4600/banner.gif

It deletes itself after execution.