W32/Rbot-APZ is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-APZ spreads to other network computers infected with: Troj/Kuang, Troj/Sub7, W32/Sasser, Troj/NetDevil, W32/MyDoom, W32/Bagle and Troj/Optix and to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WebDav (MS03-007), IIS5SSL (MS04-011) (CAN-2003-0719), UPNP (MS01-059), Dameware (CAN-2003-1030) and ASN.1 (MS04-007).
W32/Rbot-APZ 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-APZ copies itself to <System>\MSGUPDATED.EXE.
The following registry entries are created to run MSGUPDATED.EXE on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
MICROSFT ANTIVIRUS UPDATE SUPPORT
MSGUPDATED.EXE
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
MICROSFT ANTIVIRUS UPDATE SUPPORT
MSGUPDATED.EXE
The following registry entry is set:
HKCU\Software\Microsoft\OLE
MICROSFT ANTIVIRUS UPDATE SUPPORT
MSGUPDATED.EXE