TROJ_PIRMINAY.LP
Trojan.Gen (Symantec), Trojan.Win32.Pirminay.coq (Kaspersky), W32/Pirminay.COQ!tr (Fortinet), TR/Pirminay.cld (AntiVir), Trojan.Pirminay (Ikarus)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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 connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats. As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
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 and executes the following files:
- %System%\{random file name}.exe - detected as TROJ_FAM_00001e3.TOMA
(Note: %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.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\{random registry key}
HKEY_LOCAL_MACHINE\SOFTWARE\{random registry key}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
6 = {random values}
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
9 = {random values}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings
6 = {random values}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings
9 = {random values}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random characters} = "%System%\{random file name}.exe"
Dropping Routine
This Trojan drops the following files:
- %System Root%\Documents and Settings\{user name}xplore.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Download Routine
This Trojan connects to the following malicious URLs:
- http://{BLOCKED}ut4.cn/update/utu.dat
As of this writing, the said sites are inaccessible.
HOSTS File Modification
This Trojan adds the following strings to the Windows HOSTS file:
- 127.0.0.1 thepiratebay.org
- 127.0.0.1 www.thepiratebay.org
- 127.0.0.1 mininova.org
- 127.0.0.1 www.mininova.org
- 127.0.0.1 forum.mininova.org
- 127.0.0.1 blog.mininova.org
- 127.0.0.1 suprbay.org
- 127.0.0.1 www.suprbay.org
SOLUTION
NOTES:
Trend customers:
Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.
All Internet users:
- Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
- Catch malware/grayware before they affect your PC or network. Secure your Web world with Trend Micro products that offer the best anti-threat and content security solutions for home users, corporate users, and ISPs. Go here for more information on Trend Micro products that fit your needs.
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