Summary

Cabrotor is backdoor, allowing an attacker to control the machine where it runs. The trojan itself is a Windows PE EXE file written in Delphi.

Additional Details

The original trojan package contains three main executable files:

 CaBrONaToR.exe - client to send commands to remote server
 CaBrONeDiT.exe - server editor to modify default server settings
 8======D.exe - server (trojan itself)

When run, the backdoor code copies itself to the Windows directory and registers itself in the system registry in the auto-run section. In different backdoor versions the backdoor EXE name and registry keys are different. The known variant has:

Executable name:

 ASDAPI.EXE

The registry key entries it creates are located in:

 [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
 [HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices]

And their names are:

 LoadPowerProfile

The trojan then opens a connection to its master's IRC channel and waits for its master's commands.

The backdoor allows the attacker to invoke any of the following commands:

 Reports computer information (Windows version, CPU type, UserName, CompanyName)
 Open/closes CD drive
 Reports directories and file names
 Runs a local file or command
 Send information: RAS, MS Messenger and .NET services
 Exits Windows
 Downloads a requested file
 Performs DoS attack to a requested victim address
 Terminates itself

Detection

Detection for Cabrotor worm is available in the following FSAV updates:

[FSAV_Database_Version]

Version=2002-07-22_01

Technical Details: Kaspersky Lab

F-Secure Corporation