Virus:Worm/Rbot.121856.8
Date discovered:31/10/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:121.856 Bytes
MD5 checksum:63f306cc436105536ba6c09628d62cd0
VDF version:6.32.00.127

 General Method of propagation:
   • Local network


Aliases:
   •  Symantec: W32.Spybot.Worm
   •  Kaspersky: Backdoor.Win32.Rbot.ahl
   •  TrendMicro: WORM_RBOT.CPM
   •  F-Secure: Backdoor.Win32.Rbot.ahl
   •  Sophos: W32/Rbot-ATE
   •  Panda: W32/Sdbot.FNM.worm
   •  VirusBuster: Worm.Rbot.CTT
   •  Eset: Win32/Rbot
   •  Bitdefender: Backdoor.RBot.FGB


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%\IHSVC.EXE



It deletes the initially executed copy of itself.

 Registry The following registry keys are added in order to run the processes after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "Internet Help Svc"="IHSVC.EXE"

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
   • "Internet Help Svc"="IHSVC.EXE"

– HKCU\Software\Microsoft\Windows\CurrentVersion\Run
   • "Internet Help Svc"="IHSVC.EXE"

– HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
   • "Internet Help Svc"="IHSVC.EXE"



The following registry keys are added:

– HKLM\SOFTWARE\Microsoft\Ole
   • "Internet Help Svc"="IHSVC.EXE"

– HKLM\SYSTEM\CurrentControlSet\Control\Lsa
   • "Internet Help Svc"="IHSVC.EXE"

– HKCU\Software\Microsoft\OLE
   • "Internet Help Svc"="IHSVC.EXE"

– HKCU\SYSTEM\CurrentControlSet\Control\Lsa
   • "Internet Help Svc"="IHSVC.EXE"

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

It drops copies of itself to the following network shares:
   • IPC$
   • C$
   • ADMIN$\system32\
   • ADMIN$


Exploit:
It makes use of the following Exploits:
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-007 (ASN.1 Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)


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


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


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

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

Server: hhsv.service.**********
Port: 4654
Server password: gringle
Channel: #12#
Nickname: %eight-digit random character string%
Password: shabby123

Server: hhsv.service.**********
Port: 65528
Server password: gringle
Channel: #12#
Nickname: %eight-digit random character string%
Password: shabby123

Server: hhsv.service.**********
Port: 4564
Server password: gringle
Channel: #12#
Nickname: %eight-digit random character string%
Password: shabby123

Server: hhsv.service.**********
Port: 65529
Server password: gringle
Channel: #12#
Nickname: %eight-digit random character string%
Password: shabby123



– This malware has the ability to collect and send information such as:
    • Collected Email addresses
    • 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
    • Disable DCOM
    • Disable network shares
    • Download file
    • Enable DCOM
    • Enable network shares
    • Execute file
    • Kill process
    • Open remote shell
    • Perform network scan
    • Register a service
    • Send emails
    • Start spreading routine
    • Terminate process
    • Updates itself
    • Upload file

 Miscellaneous Mutex:
It creates the following Mutex:
   • hhs32

 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, April 6, 2006
Description updated by Irina Boldea on Wednesday, April 19, 2006

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