W32/Rbot-AGX is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-AGX spreads to other network computers by exploiting the WKS (MS03-049) buffer overflow vulnerability.
W32/Rbot-AGX 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-AGX includes functionality to:
- steal confidential information
- log key strokes to the file <System>\keys.txt
- silently download, install and run new software
When first run W32/Rbot-AGX copies itself to <System>\lexplore.exe.
The following registry entries are created to run lexplore.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Configuration Loader
lexplore.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Configuration Loader
lexplore.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Configuration Loader
lexplore.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Configuration Loader
lexplore.exe
Registry entries are set as follows:
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Configuration Loader
lexplore.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Configuration Loader
lexplore.exe
HKCU\Software\Microsoft\OLE
Configuration Loader
lexplore.exe
HKLM\SOFTWARE\Microsoft\Ole
Configuration Loader
lexplore.exe
W32/Rbot-AGX may also create the file "msdirectx.sys" which is detected by Sophos as Troj/NtRootK-F.
The following patch for the operating system vulnerability exploited by W32/Rbot-AGX can be obtained from the Microsoft website:
MS03-049