24 february, 2010

W32.Spybot.AVEO

Risk Level 2: Low

Discovered: February 23, 2010
Updated: February 23, 2010 2:28:00 PM
Type: Worm
Infection Length: Varies
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
CVE References: CVE-2003-0605, CVE-2006-2369, CVE-2006-2630

SUMMARY

W32.Spybot.AVEO is a worm that attempts to exploit a number of vulnerabilities in order to spread. It may also spread through network shares protected by weak passwords.

Protection

Initial Rapid Release version February 23, 2010 revision 008
Latest Rapid Release version February 23, 2010 revision 008
Initial Daily Certified version February 23, 2010 revision 022
Latest Daily Certified version February 23, 2010 revision 022
Initial Weekly Certified release date February 24, 2010

Threat Assessment

Wild

Wild Level: Low
Number of Infections: 0 - 49
Number of Sites: 0 - 2
Geographical Distribution: Low
Threat Containment: Easy
Removal: Easy

Damage

Damage Level: Medium
Payload: Opens a back door on the compromised computer.
Releases Confidential Info: Steals information from the compromised computer.

Distribution

Distribution Level: Medium
Shared Drives: Spreads through network shares.
Target of Infection: Exploits certain vulnerabilities.

TECHNICAL DETAILS

When the worm executes, it creates the following file:
%System%\windowsupdate.exe

Next, the worm creates the following registry entries so that it executes whenever Windows starts:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Windows Firewall Updater" = "windowsupdate.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\"Windows Firewall Updater" = "windowsupdate.exe"

The worm also creates the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\"EnableRemoteConnect" = "N"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT1.0\Server\"Enabled" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\"AutoShareWks" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\"AutoShareServer" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\C:\WINDOWS\system32\"windowsupdate.exe" = "C:\WINDOWS\system32\windowsupdate.exe:*:Enabled:Windows Firewall Updater"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"AllowUnqualifiedQuery" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"PrioritizeRecordData" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TCP1320Opts" = "3"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"KeepAliveTime" = "23280"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"BcastQueryTimeout" = "2EE"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"BcastNameQueryCount" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"CacheTimeout" = "EA60"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"Size/Small/Medium/Large" = "3"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"LargeBufferSize" = "1000"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"SynAckProtect" = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"PerformRouterDiscovery" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnablePMTUBHDetect" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"FastSendDatagramThreshold " = "400"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"StandardAddressLength " = "18"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DefaultReceiveWindow " = "4000"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DefaultSendWindow" = "4000"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"BufferMultiplier" = "200"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"PriorityBoost" = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"IrpStackSize" = "4"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"IgnorePushBitOnReceives" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DisableAddressSharing" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"AllowUserRawAccess" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DisableRawSecurity" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DynamicBacklogGrowthDelta" = "32"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"FastCopyReceiveThreshold" = "400"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"LargeBufferListDepth" = "A"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxActiveTransmitFileCount" = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxFastTransmit" = "40"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"OverheadChargeGranularity" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"SmallBufferListDepth" = "20"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"SmallerBufferSize" = "80"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TransmitWorker" = "20"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DNSQueryTimeouts" = "31 00 00 00 00 00 00 00 32 00 00 00 00 00 00 00 32 00 00 00 00 00 00 00 34 00 00 00 00 00 00 00 38 00 00 00 00 00 00 00 30 00 00 00 00 00 00 00 00 00 00 00"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DefaultRegistrationTTL" = "14"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DisableReplaceAddressesInConflicts" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DisableReverseAddressRegistrations" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"UpdateSecurityLevel " = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DisjointNameSpace" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"QueryIpMatching" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"NoNameReleaseOnDemand" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnableDeadGWDetect" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnableFastRouteLookup" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxFreeTcbs" = "7D0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxHashTableSize" = "800"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"SackOpts" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"Tcp1323Opts" = "3"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpMaxDupAcks" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpRecvSegmentSize" = "585"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpSendSegmentSize" = "585"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpWindowSize" = "7D200"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DefaultTTL" = "30"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpMaxHalfOpen" = "4B"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpMaxHalfOpenRetried" = "50"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"TcpTimedWaitDelay" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxNormLookupMemory" = "30D40"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"FFPControlFlags" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"FFPFastForwardingCacheSize" = "30D40"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxForwardBufferMemory" = "19DF7"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"MaxFreeTWTcbs" = "7D0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"GlobalMaxTcpWindowSize" = "7D200"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnablePMTUDiscovery" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"ForwardBufferMemory" = "19DF7"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"MaxConnectionsPer1_0Server" = "50"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"MaxConnectionsPerServer" = "50"
HKEY_CURRENT_USER\Software\Microsoft\OLE\"Windows Firewall Updater" = "windowsupdate.exe"

The worm then modifies the following registry entry in order to disable DCOM:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\"EnableDCOM" = "N"

It also modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\"restrictanonymous" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters\"TransportBindName" = ""
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\"Start" = "4"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Epoch\"Epoch" = "D22"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnableICMPRedirect" = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"EnableSecurityFilters" = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc\"Start" = "4"

Next, the worm opens a back door and connects to the following location on TCP port 4003:
tracox.pwnz.org

The worm may then receive the following commands using the IRC protocol:

Denial of Service
ICMP
Keylogs
TCP
UDP

It may then perform the following actions:

Act as a ftpf server
Act as a proxy server
Act as a socks4 server
Capture video from Web cameras
Execute commands
Flush the DNS
Get clipboard contents
Send emails
Update itself

The worm attempts to spread by exploiting the following vulnerabilities:

Microsoft Windows RPCSS DCOM Interface Denial of Service Vulnerability (BID 8234)
Microsoft ASN.1 Library Multiple Stack-Based Buffer Overflow Vulnerabilities (BID 9743)
RealVNC Remote Authentication Bypass Vulnerability (BID 17978)
Symantec Client Security and Symantec AntiVirus Elevation of privilege (BID 18107)

It also attempts to spread through MSQL by using weak user names and passwords.

The worm may also attempt to spread across network shares, including the following router share:
\\192.168.1.210\IPC$

Next, the worm records all information sent to windows with titles that contain certain key strings relating to various Web sites and online services.

It also steals all information relating to the following games and applications:

Battlefield 1942
Battlefield 1942 (Road To Rome)
Battlefield 1942 (Secret Weapons of WWII)
Battlefield Vietnam
Black and White
Chrome
Command and Conquer: Generals
Command and Conquer: Generals (Zero Hour)
Command and Conquer: Red Alert
Command and Conquer: Red Alert 2
Command and Conquer: Tiberian Sun
Covert Strike
FIFA 2002
FIFA 2003
Freedom Force
Global Operations
Hidden & Dangerous 2
Industry Giant 2
James Bond 007: Nightfire
Legends of Might and Magic
Medal of Honor: Allied Assault
Medal of Honor: Allied Assault: Breakthrough
Medal of Honor: Allied Assault: Spearhead
Microsoft Windows Product ID
Nascar Racing 2002
Nascar Racing 2003
Need For Speed Hot Pursuit 2
Need For Speed: Underground
Neverwinter Nights
Neverwinter Nights (Hordes of the Underdark)
Neverwinter Nights (Shadows of Undrentide)
NHL 2002
NHL 2003
NOX
Rainbow Six III RavenShield
Shogun: Total War: Warlord Edition
Soldier of Fortune II - Double Helix
Soldiers Of Anarchy
Unreal Tournament 2003
Unreal Tournament 2004

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
For further information on the terms used in this document, please refer to the Security Response glossary.