TROJ_PIRMINAY

PIRMINAY is a family of Trojans first spotted in 2011. Its variants are known to gather system information from an affected system and send the stolen data back to a remote server.

PIRMINAY is also known to modify the affected system's HOSTS file in order to prevent the user from accessing certain websites.

Installation

This Trojan drops the following files:

• %Application Data%\{random}.exe
• %System%\{random}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

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
{random} = "%Application Data%\{random}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random} = "%System%\{random}.exe"

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\{random}

HKEY_LOCAL_MACHINE\Software\{random}

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}ut4.cn/update/utu.dat
• http://{BLOCKED}ebspeed.net/html/{hex numbers}.html
• http://{BLOCKED}tfriendly.com/html/license_{hex numbers}.html
• http://{BLOCKED}nc.net/html/{hex numbers}.html