1. Symantec/
  2. Security Response/
  3. W32.Arpiframe


Risk Level 1: Very Low

June 12, 2007
September 3, 2007 6:19:08 PM
Infection Length:
737.2380 bytes
Systems Affected:
CVE References:
CVE-2006-0003, CVE-2007-1215
Once executed, the worm drops the following files:
  • %System%\wuclmi.exe (a hacktool)
  • %System%\sevices.exe (a copy of wuclmi.exe)
  • %System%\wincfg.exe (WinPCap libraries installer)
  • %System%\capinstall.exe (a copy of wincfg.exe)

Next, the worm runs the file %System%\capinstall.exe in the background to install WinPCap libraries on the compromised computer. The installer will create some of the following clean files:
  • %System%\daemon_mgm.exe
  • %System%\NetMonInstaller.exe
  • %System%\npf_mgm.exe
  • %System%\rpcapd.exe
  • %System%\wpcap.dll
  • %System%\Packet.dll
  • %System%\pthreadVC.dll
  • %System%\WanPacket.dll
  • %System%\drivers\npf.sys

The worm waits until installation is finished and then it deletes the file %System%\capinstall.exe.

The worm then gathers the local subnet address, such as 192.168.1.x, and runs an ARP-poisoning attack on the local network to infect other computers. The attack uses WinPCap libraries to inject the following malicious IFRAME code into HTTP traffic of the local network:

The malicious IFRAME will be injected in Web pages viewed by other computers connected to the same local network. The IFRAME forces those computers to download the following exploits for Internet Explorer:
  • [http://]www.if56.cn/ad.[REMOVED] (Microsoft Windows Graphics Rendering Engine GDI Local Privilege Escalation Vulnerability (BID 23273))
  • [http://]1234.89111.cn/[REMOVED] (Microsoft MDAC RDS.Dataspace ActiveX Control Remote Code Execution Vulnerability (BID 17462))

The exploits may download a copy of the worm or some additional malware.

It has been reported that W32.Arpiframe installs a copy of W32.Drom downloaded from the following URLs:
  • [http://]down.if56.cn/abc[REMOVED]
  • [http://]down.if56.cn/avp.e[REMOVED]

It has been reported that variants of this threat also inject the following iframe:


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: Elia Florio
Summary| Technical Details| Removal

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