Icon of program: Microsoft Security Update

Microsoft Security Update for Windows

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Editors’ Review

Download.com staff
This critical security update addresses the W32.Blaster.Worm. Applying patch MS03-026 is essential to prevent exploitation of a DCOM RPC vulnerability and system reboots.

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  • Pros

    • Prevents Blaster Worm infection
    • Protects against DCOM RPC vulnerability
    • Mitigates system reboots
    • Stops unauthorized file execution
    • Enhances system security

  • Cons

    • Does not detect existing infections
    • Requires manual application
    • Does not remove the worm if already present
    • Relies on user action for installation
Icon of program: Microsoft Security Update

Microsoft Security Update for Windows

Download now

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Full Specifications

GENERAL
Release
Latest update
Version
MS03-026
OPERATING SYSTEMS
Platform
Windows
Operating System
  • Windows 2003
  • Windows 10
  • Windows XP
  • Windows 98
  • Windows 2000
Additional Requirements
Windows XP, Windows 2000, Windows Server 2003, Windows NT 4.0, NT 4.0 Terminal Services Edition
POPULARITY
Total Downloads
5,071
Downloads Last Week
0
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Developer’s Description

By Microsoft
Security patch to prevent Blaster Worm virus
The Microsoft Product Support Services Security Team is issuing this alert to inform customers about a new worm named W32.Blaster.Worm which is spreading in the wild. This virus is also known as: W32/Lovsan.worm (McAfee), WORM_MSBLAST.A (Trendmicro), Win32.Posa.Worm (Computer Associates). Best practices, such as applying security patch MS03-026 should prevent infection from this worm.

This worm scans a random IP range to look for vulnerable systems on TCP port 135. The worm attempts to exploit the DCOM RPC vulnerability patched by MS03-026.

Once the Exploit code is sent to a system, it downloads and executes the file MSBLAST.EXE from a remote system via TFTP. Once run, the worm creates the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "windows auto update" = msblast.exe I just want to say LOVE YOU SAN!! bill

Symptoms of the virus: Some customers may not notice any symptoms at all. A typical symptom is the system is rebooting every few minutes without user input. Customers may also see:

  • Presence of unusual TFTP* files
  • Presence of the file msblast.exe in the WINDOWS SYSTEM32 directory

To detect this virus, search for msblast.exe in the WINDOWS SYSTEM32 directory or download the latest anti-virus software signature from your anti-virus vendor and scan your machine.

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