WORM_SOHANAD.CZR

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.

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 creates the following folders:

• %User Temp%\E_4

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
XP-542ADE6B = "%System%\XP-542ADE6B.EXE"

Other System Modifications

This worm deletes the following files:

• %User Profile%\Cookies\index.dat
• %Temporary Internet Files%\Content.IE5\09RWHJQN\desktop.ini
• %Temporary Internet Files%\Content.IE5\BVLBNMKH\desktop.ini
• %Temporary Internet Files%\Content.IE5\desktop.ini
• %Temporary Internet Files%\Content.IE5\index.dat
• %Temporary Internet Files%\Content.IE5\ZDGZNKA5\desktop.ini
• %Temporary Internet Files%\Content.IE5\ZSGKJKO6\desktop.ini
• %Temporary Internet Files%\desktop.ini
• %User Profile%\History.IE5\index.dat

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It deletes the following folders:

• %User Profile%\History\History.IE5

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Dropping Routine

This worm drops the following files:

• %User Temp%\E_4\krnln.fnr
• %User Temp%\E_4\shell.fne
• %User Temp%\E_4\eAPI.fne
• %User Temp%\E_4\internet.fne
• %User Temp%\E_4\spec.fne
• %User Temp%\E_4\RegEx.fnr
• %User Temp%\E_4\dp1.fne
• %User Temp%\E_4\com.run
• %System%\XP-542ADE6B.EXE
• %System%\ul.dll
• %System%\og.dll
• %System%\og.EDT
• %User Startup%\¡¡¡¡¡¡.lnk
• %System%\XP-F379A78A.EXE
• %System%\com.run
• %System%\dp1.fne
• %System%\eAPI.fne
• %System%\internet.fne
• %System%\krnln.fnr
• %System%\RegEx.fnr
• %System%\shell.fne
• %System%\spec.fne

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This worm connects to the following possibly malicious URL:

• http://www.{BLOCKED}oft.com

This report is generated via an automated analysis system.