W32/Rbot-ASW is an IRC worm and backdoor Trojan for the Windows platform.
W32/Rbot-ASW may spread by copying itself to network shares or by exploiting the vulnerabilities LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049), WebDav (MS03-007), IIS5SSL (MS04-011), UPNP (MS01-059), Veritas (CAN-2004-1172), Dameware (CAN-2003-1030) or ASN.1 (MS04-007).
W32/Rbot-ASW 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-ASW copies itself to <System>\syshost.exe.
The following registry entries are created to run syshost.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Windows System
syshost.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Windows System
syshost.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Windows System
syshost.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Windows System
syshost.exe
Registry entries are set as follows:
HKCU\Software\Microsoft\OLE
Microsoft Windows System
syshost.exe
HKLM\SOFTWARE\Microsoft\Ole
Microsoft Windows System
syshost.exe
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1