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Virus:Worm/IRCBot.50176
Date discovered:19/08/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:50.176 Bytes
MD5 checksum:a0a9e853b4ca1b2b66c39a44e374a25e
VDF version:6.31.01.146

 General Method of propagation:
   • Local network


Aliases:
   •  Kaspersky: Backdoor.Win32.Rbot.yb
   •  TrendMicro: WORM_RBOT.CKK
   •  Sophos: W32/KBBot-A
   •  Eset: Win32/Rbot
   •  Bitdefender: Backdoor.SDBot.DEA


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\wnsvc.exe



It deletes the initially executed copy of itself.

 Registry The following registry key is added in order to run the process after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "WN Services"="wnsvc.exe"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


Exploit:
It makes use of the following Exploit:
– MS04-007 (ASN.1 Vulnerability)


IP address generation:
It creates random IP addresses while it keeps the first octet from its own address. Afterwards it tries to establish a connection with the created addresses.


Infection process:
Creates a TFTP script on the compromised machine in order to download the malware to the remote location.

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: micro.nun**********
Port: 6564
Server password: cheezw00p
Channel: #&robots
Nickname: \%seven-digit random character string%
Password: koolbotz

Server: micro.leet**********
Port: 6564
Server password: cheezw00p
Channel: #&scanning
Nickname: \%seven-digit random character string%
Password: koolbotz



– This malware has the ability to collect and send information such as:
    • CPU speed
    • Current user
    • Details about drivers
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Information about running processes
    • Size of memory
    • Username
    • Information about the Windows operating system


– Furthermore it has the ability to perform actions such as:
    • Launch DDoS ICMP flood
    • Launch DDoS SYN flood
    • Launch DDoS TCP flood
    • Launch DDoS UDP flood
    • Download file
    • Execute file
    • Kill process
    • Perform DDoS attack
    • Perform network scan
    • Start spreading routine
    • Terminate malware
    • Terminate process
    • Updates itself

 File details Programming language:
The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Irina Boldea on Thursday, May 11, 2006
Description updated by Irina Boldea on Thursday, May 11, 2006

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