TROJ_PAKES.ONA

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.

It deletes itself after execution.

It adds registry entries to enable its automatic execution at every system startup.

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 drops the following copies of itself into the affected system:

• %User Profile%\Application Data\xi1ww1bqcwk2zpyfkec2ipi3bufxmxmj2\svcnost.exe

(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 creates the following folders:

• %User Profile%\Application Data\xi1ww1bqcwk2zpyfkec2ipi3bufxmxmj2

(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 itself after execution.

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
mssend = "%User Profile%\Application Data\xi1ww1bqcwk2zpyfkec2ipi3bufxmxmj2\svcnost.exe"

Other System Modifications

This Trojan creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\xi1ww1bqcwk2zpyfkec2ipi3bufxmxmj2\svcnost.exe = "%User Profile%\Application Data\xi1ww1bqcwk2zpyfkec2ipi3bufxmxmj2\svcnost.exe:*:Enabled:ldrsoft "