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PE_HLLW.DENIS.A

October 08, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This file infector may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

70656 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Aug 2001

Arrival Details

This file infector may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This file infector drops the following copies of itself into the affected system:

  • %SYSTEM%\winapp.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Netvx = %SYSTEM%\winapp.exe

Other System Modifications

This file infector adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Tress

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\App Paths\
no.exe

It adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\Software\Tress
Installed = {date}

HKEY_LOCAL_MACHINE\Software\Tress
User = {username}

HKEY_LOCAL_MACHINE\Software\Tress
RunCount = {count}

HKEY_LOCAL_MACHINE\Software\Tress
MineCount = {count}

HKEY_LOCAL_MACHINE\Software\Tress
Ver = dword:0000000c

HKEY_LOCAL_MACHINE\Software\Tress
InstalledAs = winapp.exe

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\App Paths\
no.exe
Default = %SYSTEM%\winapp.exe

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Policies\
Network
DisablePwdCaching = 1

  SOLUTION

Minimum Scan Engine:

8.900

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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