Difference between revisions of "Trojan Horse"

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[[Category:OWASP ASDR Project]]
  
==Description==
 
  
A Trojan horse is a program that uses malicious code masqueraded as a benign application. The term derives from the myth of the Greek Trojan Horse on the Trojan War. The malicious code can be injected on legitimate software to be installed by victim, or the supposed benign program itself can be the Trojan horse. The victim is usually tricked to open the Trojan horse because it appears to be received from a legitimate source.
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Last revision (mm/dd/yy): '''{{REVISIONMONTH}}/{{REVISIONDAY}}/{{REVISIONYEAR}}'''
This kind of malware looks and acts like a virus, but the difference resides on the fact that Trojan horse does not self-replicate. The infected computer experience many different symptoms similar to virus, as background configuration auto changing, mouse buttons function reversing, system crashes, the famous blue screen, computer reboots itself, Ctrl + Alt + Del stops working, and many other symptoms described later in this document.
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The ultimate Trojan horse uses javascript to make furtive attack, free of antimalware intervention and users interception, normally used on attacks against internet banking transactions on-the-fly, resulting victim´s financial loss.
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Other details can be found on [[Man-in-the-browser attack]].
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==Description==
  
'''The 7 main types of Trojan Horse'''
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A Trojan Horse is a program that uses malicious code masqueraded as a trusted application. The malicious code can be injected on benign applications, masqueraded in e-mail links, or sometimes hidden in JavaScript  pages to make furtive attacks against vulnerable internet Browsers.
  
1.Remote Access Trojan (RAT)
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Other details can be found in [[Man-in-the-browser attack]].
  
Designed to provide the attacker full control of the infected machine. Trojan horse usually masqueraded as a utility.  
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===The 7 Main Types of Trojan Horse===
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# '''Remote Access Trojan (RAT):''' Designed to provide the attacker full control of the infected machine. Trojan horse usually masqueraded as a utility.
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# '''Data Sending Trojan:''' Trojan horse that uses keylogger technology to capture sensitive data like passwords, credit card and banking information, and IM messages, and sends them back to the attacker.
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# '''Destructive Trojan:''' Trojan horse designed to destroy data stored on the victim’s computer.
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# '''Proxy Trojan:''' Trojan horse that uses the victim's computer as a proxy server, providing the attacker an opportunity to execute illicit acts from the infected computer, like banking fraud, and even malicious attacks over the internet.
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# '''FTP Trojan:''' This type of Trojan horse uses the port 21 to enable the attackers to connect to the victim's computer using File Transfer Protocol.
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# '''Security software disabler Trojan:''' This Trojan horse is designed to disable security software like firewall and antivirus, enabling the attacker to use many invasion techniques to invade the victim's computer, and even to infect more than the computer.
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# '''Denial-of-Service attack Trojan:''' Trojan horse designed to give the attacker opportunity to realize Denial-of-Service attacks from victim's computer.
  
2.Data Sending Trojan
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===Symptoms===
  
Trojan horse that uses keylogger technology to capture sensitive data like passwords, credit card and banking information, IM messages, and send back to attacker.
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Some common symptoms:
  
3.Destructive Trojan
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* Wallpaper and other background settings auto-changing
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* Mouse pointer disappears
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* Programs auto-loading and unloading
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* Strange window warnings, messages and question boxes, and options being displayed constantly
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* e-mail client auto sending messages to all on the user's contacts list
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* Windows auto closing
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* System auto rebooting
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* Internet account information changing
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* High internet bandwidth being used without user action
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* Computer's high resources consumption (computer slows down)
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* Ctrl + Alt + Del stops working
  
Trojan horse designed to destroy data stored on victim’s computer.
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== Risk Factors==
 
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High: A Trojan horse can break through all security polices in a network, because an attacker can
4.Proxy Trojan
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get access to a WorkStation with stored network credentials. With these credentials, an
 
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attacker can compromise the whole network.
Trojan horse that uses the victim´s computer as a proxy server, providing attacker opportunity to execute illicit acts from the infected computer, like banking fraud, and even malicious attacks over the internet.
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5.FTP Trojan
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This type of Trojan horse uses the port 21 to enable the attackers to connect to the victim´s computer using File Transfer Protocol.
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6.Security software disabler Trojan
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The Trojan horse is designed to disable security software like firewall and antivirus, enabling the attacker to use many invasion techniques to invade the victim´s computer, and even to infect more the computer.
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7.Denial-of-Service attack Trojan
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Trojan horse designed to give the attacker opportunity to realize Denial-of-Service attacks from victim´s computer.
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'''Symptoms'''
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A list of common symptoms is described in this section.
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•Wallpaper and other background settings auto changing
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•Internet browser display unknown web sites
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•Mouse pointer disappear
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•Sound volume auto changing
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•Buttons, shortcuts and other basic resources disappear
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•Programs auto loading and unloading
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•Strange windows warnings, messages and question box, and options being displayed constantly
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•e-mail client auto sending messages to all user´s contacts list
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•Windows auto closing
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•System auto rebooting
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•Internet accounts information changing
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•High internet bandwidth being used without user action
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•Computer´s high resources consumption (computer slows down)
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•Popup with adult content or illegal references appearing without user action
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•Ctrl + Alt + Del stops working
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•Other users connected to the computer
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•Documents being sent to the printer without user action
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•DVD/CD drive´s drawer auto opening and closing
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== Severity ==
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High
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== Likelihood of exploitation ==
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Medium to High
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==Examples==
 
==Examples==
 
A Javascript Trojan Horse example can be found on: http://www.attacklabs.com/download/sniffer.rar .
 
 
 
An iframe pointing to a javascript which downloads malware: http://isc.sans.org/diary.html?storyid=2923&dshield=4c501ba0d99f5168ce114d3a3feab567
 
An iframe pointing to a javascript which downloads malware: http://isc.sans.org/diary.html?storyid=2923&dshield=4c501ba0d99f5168ce114d3a3feab567
  
== External References==
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[[Category:FIXME|link not working
  
*[[http://myappsecurity.blogspot.com/2007/01/ajax-sniffer-prrof-of-concept.html | Ajax Sniffer]]
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A Javascript Trojan Horse example can be found on: http://www.attacklabs.com/download/sniffer.rar .
 
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*[[http://hacker-eliminator.com/trojansymptoms.html | Trojan Infection Symptoms]]
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*[[http://www.webopedia.com/DidYouKnow/Internet/2004/virus.asp | The Difference Between a Virus, Worm and Trojan Horse]]
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==Related Threats==
 
  
*[[:Category:Client-side Attacks]]
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]]
  
==Related Attacks==
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==Related [[Threat Agents]]==
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* [[:Category:Client-side Attacks]]
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[[Category:FIXME|need links]]
  
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==Related [[Attacks]]==
 
* [[Spyware]]
 
* [[Spyware]]
 
* [[Phishing]]
 
* [[Phishing]]
  
==Related Vulnerabilities==
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==Related [[Vulnerabilities]]==
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* TBD
  
TBD
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==Related [[Controls]]==
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* TBD
  
==Related Countermeasures==
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== References==
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* [http://myappsecurity.blogspot.com/2007/01/ajax-sniffer-prrof-of-concept.html  Ajax Sniffer]
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* [http://hacker-eliminator.com/trojansymptoms.html Trojan Infection Symptoms]
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* [http://www.webopedia.com/DidYouKnow/Internet/2004/virus.asp The Difference Between a Virus, Worm and Trojan Horse]
  
TBD
 
  
  
[[Category:Malicious Code Attack]]
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[[Category:Embedded Malicious Code]]
  
 
[[Category:Attack]]
 
[[Category:Attack]]

Latest revision as of 13:27, 27 May 2009

This is an Attack. To view all attacks, please see the Attack Category page.




Last revision (mm/dd/yy): 05/27/2009

Description

A Trojan Horse is a program that uses malicious code masqueraded as a trusted application. The malicious code can be injected on benign applications, masqueraded in e-mail links, or sometimes hidden in JavaScript pages to make furtive attacks against vulnerable internet Browsers.

Other details can be found in Man-in-the-browser attack.

The 7 Main Types of Trojan Horse

  1. Remote Access Trojan (RAT): Designed to provide the attacker full control of the infected machine. Trojan horse usually masqueraded as a utility.
  2. Data Sending Trojan: Trojan horse that uses keylogger technology to capture sensitive data like passwords, credit card and banking information, and IM messages, and sends them back to the attacker.
  3. Destructive Trojan: Trojan horse designed to destroy data stored on the victim’s computer.
  4. Proxy Trojan: Trojan horse that uses the victim's computer as a proxy server, providing the attacker an opportunity to execute illicit acts from the infected computer, like banking fraud, and even malicious attacks over the internet.
  5. FTP Trojan: This type of Trojan horse uses the port 21 to enable the attackers to connect to the victim's computer using File Transfer Protocol.
  6. Security software disabler Trojan: This Trojan horse is designed to disable security software like firewall and antivirus, enabling the attacker to use many invasion techniques to invade the victim's computer, and even to infect more than the computer.
  7. Denial-of-Service attack Trojan: Trojan horse designed to give the attacker opportunity to realize Denial-of-Service attacks from victim's computer.

Symptoms

Some common symptoms:

  • Wallpaper and other background settings auto-changing
  • Mouse pointer disappears
  • Programs auto-loading and unloading
  • Strange window warnings, messages and question boxes, and options being displayed constantly
  • e-mail client auto sending messages to all on the user's contacts list
  • Windows auto closing
  • System auto rebooting
  • Internet account information changing
  • High internet bandwidth being used without user action
  • Computer's high resources consumption (computer slows down)
  • Ctrl + Alt + Del stops working

Risk Factors

High: A Trojan horse can break through all security polices in a network, because an attacker can get access to a WorkStation with stored network credentials. With these credentials, an attacker can compromise the whole network.

Examples

An iframe pointing to a javascript which downloads malware: http://isc.sans.org/diary.html?storyid=2923&dshield=4c501ba0d99f5168ce114d3a3feab567

Related Threat Agents

Related Attacks

Related Vulnerabilities

  • TBD

Related Controls

  • TBD

References