W32/Rbot-ANR is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-ANR spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), WKS (MS03-049) (CAN-2003-0812) and ASN.1 (MS04-007) and by copying itself to network shares protected by weak passwords.
W32/Rbot-ANR runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.
W32/Rbot-ANR includes functionality to:
- steal confidential information
- carry out DDoS flooder attacks
- provide a proxy server
- silently download, install and run new software
When first run W32/Rbot-ANR copies itself to <System>\MSxUP32.exe.
The following registry entries are created to run MSxUP32.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Core Support
MSxUP32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Core Support
MSxUP32.exe
The following registry entry is set:
HKCU\Software\Microsoft\OLE
Microsoft Core Support
MSxUP32.exe
The following patches for the operating system vulnerabilities exploited by W32/Rbot-ANR can be obtained from the Microsoft website:
MS04-011
MS03-049
MS04-007