TROJ_DROPPER.ZLR

This Trojan 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 Trojan 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 Trojan creates the following folders:

• %User Profile%\Microsoft\Backups
• %User Temp%\Adobe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Explorer = "%User Profile%\Microsoft\Explorer.exe"

Other System Modifications

This Trojan deletes the following files:

• {malware path and file name}:zone.identifier
• %User Profile%\Templates\dwm.exe
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1552.68171
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1552.68171
• %User Profile%\v2.0.50727.42\security.config.cch.1552.68406
• %User Profile%\Templates\dwm.exe:Zone.Identifier
• Templates:Zone.Identifier
• Desktop:Zone.Identifier
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1016.89656
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1016.89671
• %User Profile%\v2.0.50727.42\security.config.cch.1016.89750
• %User Startup%\notepad.exe:Zone.Identifier
• %User Temp%\data2.dmp
• %User Profile%\Application Data\notepad.PDB
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.2068.132406
• %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.2068.132406
• %User Profile%\v2.0.50727.42\security.config.cch.2068.132671

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %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.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Adobe\
Adobe Acrobat\10.0

HKEY_CURRENT_USER\Software\Adobe\
Adobe Synchronizer\10.0

HKEY_LOCAL_MACHINE\System\Acrobatbrokerserverdispatchercpp789

HKEY_CURRENT_USER\Software\Adobe\
Acrobat Reader\10.0\Installer\
Migrated

Dropping Routine

This Trojan drops the following files:

• %User Profile%\Templates\notepad.exe
• %Desktop%\Payment_copy.pdf
• %User Profile%\Application Data\notepad.il
• %User Temp%\temp_MF.vbs
• %User Profile%\Application Data\notepad.exe
• %User Temp%\data.dmp
• %User Temp%\data1.dmp
• %User Startup%\notepad.exe
• %User Profile%\Microsoft\notepad.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %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 Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}factory.com/admin/index.php?{random characters}

This report is generated via an automated analysis system.