W32.Randex

W32.Randex is a detection for a family of worms that spreads through file-sharing.

W32.Randex can perform different backdoor-type functions, by connecting to a configurable IRC server and joining a specific channel to listen for instructions.

Newer variants may also spread by exploiting the following vulnerabilities:

• The DCOM RPC Vulnerability (described in Microsoft Security Bulletin MS03-026) using TCP port 135.
• The Microsoft Windows Local Security Authority Service Remote Buffer Overflow (described in Microsoft Security Bulletin MS04-011).
• The vulnerabilities in the Microsoft SQL Server 2000 or MSDE 2000 audit (described in Microsoft Security Bulletin MS02-061) using UDP port 1434.
• The WebDav Vulnerability (described in Microsoft Security Bulletin MS03-007) using TCP port 80.
• The UPnP NOTIFY Buffer Overflow Vulnerability (described in Microsoft Security Bulletin MS01-059).
• The Workstation Service Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS03-049) using TCP port 445. Windows XP users are protected against this vulnerability if the patch in Microsoft Security Bulletin MS03-043 has been applied. Windows 2000 users must apply the patch in Microsoft Security Bulletin MS03-049.

Protection

• Initial Rapid Release version June 5, 2003
• Latest Rapid Release version July 12, 2008 revision 018
• Initial Daily Certified version June 5, 2003 revision 003
• Latest Daily Certified version July 12, 2008 revision 019
• Initial Weekly Certified release date June 5, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Medium
• Number of Infections: 50 - 999
• Number of Sites: More than 10
• Geographical Distribution: Medium
• Threat Containment: Moderate
• Removal: Easy

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Medium