W32/Rbot-AYU

Please follow the instructions for removing worms.

W32/Rbot-AYU is a worm with backdoor functionality for the Windows platform.

W32/Rbot-AYU spreads using a variety of techniques including exploiting weak passwords on computers, exploiting operating system vulnerabilities (including DCOM-RPC, PNP and ASN.1) and using backdoors opened by other worms or Trojans.

W32/Rbot-AYU can be controlled by a remote attacker over IRC channels. The backdoor component of W32/Rbot-AYU can be instructed by a remote user to perform the following functions:

start an FTP server
take part in distributed denial of service (DDoS) attacks
port scanning
download/execute arbitrary files
start a remote shell (RLOGIN)
steal product registration information from certain software

W32/Rbot-AYU 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.

When first run W32/Rbot-AYU copies itself to <System>\updt.pif.

The following registry entries are created to run updt.pif on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Updt Service
updt.pif

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Updt Service
updt.pif

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Updt Service
updt.pif

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Updt Service
updt.pif

Registry entries are set as follows:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Updt Service
updt.pif

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Updt Service
updt.pif

HKCU\Software\Microsoft\OLE
Updt Service
updt.pif

HKLM\SOFTWARE\Microsoft\Ole
Updt Service
updt.pif