Worm/Rbot.97776 - Worm

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Summary

Full description

Statistics

Virus:	Worm/Rbot.97776
Date discovered:	12/09/2006
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	97.776 Bytes
MD5 checksum:	1d4937b2fa4d84ad1bce0309857e70ca
VDF version:	6.35.01.213
IVDF version:	6.35.01.217 - Wed, 13 Sep 2006 08:04 (GMT+1)

General Method of propagation:
   • Local network

Aliases:
   • Kaspersky: Backdoor.Win32.Rbot.biu
   • TrendMicro: WORM_RBOT.AQG
   • F-Secure: Backdoor.Win32.Rbot.biu
   • Grisoft: IRC/BackDoor.SdBot2.HXU
   • Eset: Win32/Rbot trojan

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

Side effects:
   • Disable security applications
   • Drops a file
   • Lowers security settings
   • Registry modification
   • Third party control

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

It deletes the initially executed copy of itself.

The following file is created:

– %malware execution directory%\removeMe%four-digit random character string%.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

Registry The following registry keys are added in order to load the services after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\Winlogin messenger]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%SYSDIR%\winlogin.exe"
   • "DisplayName"="Winlogin messenger"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Winlogin messenger"

– [HKLM\SYSTEM\CurrentControlSet\Services\Winlogin messenger\
   Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\Winlogin messenger\Enum]
   • "0"="Root\\LEGACY_WINLOGIN_MESSENGER\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

The following registry keys are changed:

– [HKLM\SYSTEM\CurrentControlSet\Control]
   Old value:
   • "WaitToKillServiceTimeout"="20000"
   New value:
   • "WaitToKillServiceTimeout"="7000"

– [HKLM\SOFTWARE\Microsoft\Security Center]
   Old value:
   • "UpdatesDisableNotify"=%user defined settings%
   • "AntiVirusDisableNotify"=%user defined settings%
   • "FirewallDisableNotify"=%user defined settings%
   • "AntiVirusOverride"=%user defined settings%
   • "FirewallOverride"=%user defined settings%
   New value:
   • "UpdatesDisableNotify"=dword:00000001
   • "AntiVirusDisableNotify"=dword:00000001
   • "FirewallDisableNotify"=dword:00000001
   • "AntiVirusOverride"=dword:00000001
   • "FirewallOverride"=dword:00000001

– [HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile]
   Old value:
   • "EnableFirewall"=%user defined settings%
   New value:
   • "EnableFirewall"=dword:00000000

– [HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile]
   Old value:
   • "EnableFirewall"=%user defined settings%
   New value:
   • "EnableFirewall"=dword:00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\
   Auto Update]
   New value:
   • "AUState"=dword:00000001
   • "AUOptions"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\wscsvc]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\ControlSet001\Services\RemoteRegistry]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\Messenger]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Control\Lsa]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "restrictanonymous"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters]
   New value:
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

– [HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
   Old value:
   • "DoNotAllowXPSP2"=%user defined settings%
   New value:
   • "DoNotAllowXPSP2"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Ole]
   New value:
   • "EnableDCOM"="N"

– [HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\
   parameters]
   New value:
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

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:
   • Z$
   • Y$
   • X$
   • W$
   • V$
   • U$
   • T$
   • S$
   • R$
   • Q$
   • P$
   • O$
   • N$
   • M$
   • L$
   • K$
   • J$
   • I$
   • H$
   • G$
   • F$
   • E$
   • D$
   • C$
   • ADMIN$
   • IPC$

It uses the following login information in order to gain access to the remote machine:

– A list of usernames and passwords:
   • server; asdfgh; asdf; !@; $%^&; !@; $%^; !@; $%; !@; $; 654321;
      123456; 12345; 1234; 123; owner; admin; edu

Exploit:
It makes use of the following Exploits:
– MS02-061 (Elevation of Privilege in SQL Server Web)
– 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)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)
–MS06-040 (Vulnerability in Server Service)

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 Server:

Server: utk.thirtyfivek.**********
Port: 504
Channel: #api
Nickname: [P00|USA|%five-digit random character string%]
Password: n1gga

– This malware has the ability to collect and send information such as:
    • Malware uptime
    • Information about the network

– Furthermore it has the ability to perform actions such as:
    • Disable network shares
    • Enable network shares
    • Updates itself

Process termination List of services that are disabled:
   • Security Center
   • Windows Firewall/ICS
   • Remote Registry
   • Telnet
   • wscsvc
   • SharedAccess
   • Messenger
   • RemoteRegistry
   • Tlntsvr

Miscellaneous Checks for an internet connection by contacting the following web site:
• www.msn.com

Mutex:
It creates the following Mutex:
• 4k040

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.

See a brief description here.

Description inserted by Adriana Popa on Thu, 12 Oct 2006 17:00 (GMT+1)
Description updated by Adriana Popa on Fri, 13 Oct 2006 10:23 (GMT+1)

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