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  3. Trojan.Peskyspy

Trojan.Peskyspy

Risk Level 1: Very Low

Discovered:
August 27, 2009
Updated:
August 27, 2009 3:05:37 PM
Also Known As:
Skytap [Trend]
Type:
Trojan
Infection Length:
98,304 bytes
Systems Affected:
Windows
When the Trojan is executed, it injects a thread into the Skype process and hooks a number of API calls, allowing it to intercept all PCM audio data going between the Skype process and underlying audio devices.

Note: Since the Trojan listens to the data coming to and from the audio devices, it gathers the audio independently of any application-specific protocols or encryption applied by Skype when it passes voice data at the network level.

It then saves the audio data to .mp3 files with the following file names and stores it in a predetermined folder:
[PREDETERMINED FOLDER NAME]\[CALLER ID]-[PACK NUMBER]-SkypeOut-[YEAR-MONTH-DAY-HOUR-MINUTE-SECOND].mp3
[PREDETERMINED FOLDER NAME]\[CALLER ID]-[PACK NUMBER]-SkypeIn-[YEAR-MONTH-DAY-HOUR-MINUTE-SECOND].mp3

Note: The incoming and outgoing audio data are stored in separate .mp3 files.

The Trojan also opens a back door on the compromised computer, allowing an attacker to perform the following actions:
Send the .mp3 to a predetermined location
Download an updated version
Delete the Trojan from the compromised computer

The Trojan also scans for the following firewall-related processes and attempts to bypass them when sending data through the back door:
mpfagent.exe
mpfservice.exe
Mcdetect.exe
McShield.exe
outpost.exe
zlclient.exe
bdagent.exe
bdmcon.exe
fsdfwd.exe
kadmin.exe
avgfwsrv.exe
webroot.exe

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: Karthik Selvaraj
Summary| Technical Details| Removal

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