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Trojan.Hydraq

Risk Level 1: Very Low

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Discovered:
January 11, 2010
Updated:
January 11, 2010 2:59:20 PM
Also Known As:
TROJ_HYDRAQ.A [Trend], Win32/Aviror.B [Computer Associates]
Type:
Trojan
Infection Length:
81,920 bytes
Systems Affected:
Windows 2000, Windows 7, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
The Trojan may arrive as an email attachment or it may be dropped or downloaded by another threat.

When executed, the threat creates one of the following files:
  • %Temp%\c_1758.nls
  • %Temp%\[RANDOM FILE NAME]

It then creates a service with the following characteristic:
Service name: RaS[FOUR RANDOM CHARACTERS]

The Trojan creates the following registry subkey in order to register the above service:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RaS[FOUR RANDOM CHARACTERS]

Next, the Trojan modifies the following registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost\"netsvcs" = "36 00 74 00 6F 00 34 00 00 00 41 00 75 00 64 00 69 00 6F 00 53 00 72 00 76 00 00 00 42 00 72 00 6F 00 77 00 73 00 65 00 72 00 00 00 43 00 72 00 79 00 70 00 74 00 53 00 76 00 63 00 00 00 44 00 4D 00 53 00 65 00 72 00 76 00 65 00 72 00 00 00 44 00 48 00 43 00 50 00 00 00 45 00 52 00 53 00 76 00 63 00 00 00 45 00 76 00 65 00 6E 00 74 00 53 00 79 00 73 00 74 00 65 00 6D 00 00 00 46 00 61 00 73 00 74 00 55 00 73 00 65 00 72 00 53 00 77 00 69 00 74 00 63 00 68 00 69 00 6E 00 67 00 43 00 6F 00 6D 00 70 00 61 00 74 00 69 00 62 00 69 00 6C 00 69 00 74 00 79 00 00 00 48 00 69 00 64 00 53 00 65 00 72 00 76 00 00 00 49 00 61 00 73 00 00 00 49 00 70 00 72 00 69 00 70 00 00 00 49 00 72 00 6D 00 6F 00 6E 00 00 00 4C 00 61 00 6E 00 6D 00 61 00 6E 00 53 00 65 00 72 00 76 00 65 00 72 00 00 00 4C 00 61 00 6E 00 6D 00 61 00 6E 00 57 00 6F 00 72 00 6B 00 73 00 74 00 61 00 74 00 69 00 6F 00 6E 00 00 00 4D 00 65 00 73 00 73 00 65 00 6E 00 67 00 65 00 72 00 00 00 4E 00 65 00 74 00 6D 00 61 00 6E 00 00 00 4E 00 6C 00 61 00 00 00 4E 00 74 00 6D 00 73 00 73 00 76 00 63 00 00 00 4E 00 57 00 43 00 57 00 6F 00 72 00 6B 00 73 00 74 00 61 00 74 00 69 00 6F 00 6E 00 00 00 4E 00 77 00 73 00 61 00 70 00 61 00 67 00 65 00 6E 00 74 00 00 00 52 00 61 00 53 00 42 00 7A 00 6B 00 46 00 00 00 52 00 61 00 73 00 61 00 75 00 74 00 6F 00 00 00 52 00 61 00 73 00 6D 00 61 00 6E 00 00 00 52 00 65 00 6D 00 6F 00 74 00 65 00 61 00 63 00 63 00 65 00 73 00 73 00 00 00 53 00 63 00 68 00 65 00 64 00 75 00 6C 00 65 00 00 00 53 00 65 00 63 00 6C 00 6F 00 67 00 6F 00 6E 00 00 00 53 00 45 00 4E 00 53 00 00 00 53 00 68 00 61 00 72 00 65 00 64 00 61 00 63 00 63 00 65 00 73 00 73 00 00 00 53 00 52 00 53 00 65 00 72 00 76 00 69 00 63 00 65 00 00 00 54 00 61 00 70 00 69 00 73 00 72 00 76 00 00 00 54 00 68 00 65 00 6D 00 65 00 73 00 00 00 54 00 72 00 6B 00 57 00 6B 00 73 00 00 00 57 00 33 00 32 00 54 00 69 00 6D 00 65 00 00 00 57 00 5A 00 43 00 53 00 56 00 43 00 00 00 57 00 6D 00 69 00 00 00 57 00 6D 00 64 00 6D 00 50 00 6D 00 53 00 70 00 00 00 77 00 69 00 6E 00 6D 00 67 00 6D 00 74 00 00 00 77 00 73 00 63 00 73 00 76 00 63 00 00 00 78 00 6D 00 6C 00 70 00 72 00 6F 00 76 00 00 00 42 00 49 00 54 00 53 00 00 00 77 00 75 00 61 00 75 00 73 00 65 00 72 00 76 00 00 00 53 00 68 00 65 00 6C 00 6C 00 48 00 57 00 44 00 65 00 74 00 65 00 63 00 74 00 69 00 6F 00 6E 00 00 00 68 00 65 00 6C 00 70 00 73 00 76 00 63 00 00 00 57 00 6D 00 64 00 6D 00 50 00 6D 00 53 00 4E 00 00 00"

The Trojan then opens a back door that allows a remote attacker to perform the following actions on the compromised computer:
  • Adjust token privileges.
  • Check status of, control, and end processes and services.
  • Download a remote file, save it as %Temp%\mdm.exe, and then execute it.
  • Create, modify, and delete registry subkeys.
  • Retrieve a list of logical drives.
  • Read, write, execute, copy, change attributes, and delete files.
  • Shut down and restart the computer.
  • Uninstall itself by deleting the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RaS[FOUR RANDOM CHARACTERS] subkey.
  • Clear all system event logs.
  • Check if %System%\acelpvc.dll is present. If so, load it and call its EntryMain() export.
  • Check if %System%\VedioDriver.dll is present.
  • Open, read, and delete the %System%\drivers\etc\networks.ics file.
  • Retrieve the CPU speed by checking the HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\"~MHz" registry value.


It then connects to one of the following domains on port 443 and sends any information gathered:
  • yahooo.8866.org
  • sl1.homelinux.org
  • 360.homeunix.com


The Trojan then redirects the computer to one of the following domains:
  • li107-40.members.linode.com
  • ftp2.homeunix.com
  • update.ourhobby.com


The Trojan also stores configuration information in the following registry entries:
  • HKEY_LOCAL_MACHINE\Software\Sun\1.1.2\"IsoTp"
  • HKEY_LOCAL_MACHINE\Software\Sun\1.1.2\"AppleTlk"

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.
Writeup By: Andrea Lelli
Summary| Technical Details| Removal

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