GameOver Zeus P2P Malware | CISA
Published: 2016-09-30 · Archived: 2026-04-05 20:12:54 UTC
Systems Affected
Microsoft Windows 95, 98, Me, 2000, XP, Vista, 7, and 8
Microsoft Server 2003, Server 2008, Server 2008 R2, and Server 2012
Overview
GameOver Zeus (GOZ), a peer-to-peer (P2P) variant of the Zeus family of bank credential-stealing malware
identified in September 2011, [1] uses a decentralized network infrastructure of compromised personal computers
and web servers to execute command-and-control. The United States Department of Homeland Security (DHS), in
collaboration with the Federal Bureau of Investigation (FBI) and the Department of Justice (DOJ), is releasing this
Technical Alert to provide further information about the GameOver Zeus botnet.
GOZ, which is often propagated through spam and phishing messages, is primarily used by cybercriminals to
harvest banking information, such as login credentials, from a victim’s computer. [2] Infected systems can also be
used to engage in other malicious activities, such as sending spam or participating in distributed denial-of-service
(DDoS) attacks. 
Prior variants of the Zeus malware utilized a centralized command and control (C2) botnet infrastructure to
execute commands. Centralized C2 servers are routinely tracked and blocked by the security community. [1]
GOZ, however, utilizes a P2P network of infected hosts to communicate and distribute data, and employs
encryption to evade detection. These peers act as a massive proxy network that is used to propagate binary
updates, distribute configuration files, and to send stolen data. [3] Without a single point of failure, the resiliency
of GOZ’s P2P infrastructure makes takedown efforts more difficult. [1]
Impact
A system infected with GOZ may be employed to send spam, participate in DDoS attacks, and harvest users'
credentials for online services, including banking services.
Solution
Users are recommended to take the following actions to remediate GOZ infections:
Use and maintain anti-virus software - Anti-virus software recognizes and protects your computer against
most known viruses. It is important to keep your anti-virus software up-to-date (see Understanding Anti-Virus Software for more information).
Change your passwords - Your original passwords may have been compromised during the infection, so
you should change them (see Choosing and Protecting Passwords for more information).
https://www.us-cert.gov/ncas/alerts/TA14-150A
Page 1 of 3

Keep your operating system and application software up-to-date - Install software patches so that attackers
can't take advantage of known problems or vulnerabilities. Many operating systems offer automatic
updates. If this option is available, you should enable it (see Understanding Patches for more information).
Use anti-malware tools - Using a legitimate program that identifies and removes malware can help
eliminate an infection. Users can consider employing a remediation tool (examples below) that will help
with the removal of GOZ from your system.
F-Secure       
https://www.f-secure.com/en/web/home_global/online-scanner (Windows Vista, 7 and 8) 
https://www.f-secure.com/en/web/labs_global/removal-tools/-/carousel/view/142 (Windows XP)
Heimdal
http://goz.heimdalsecurity.com/ (Microsoft Windows XP, Vista, 7, 8 and 8.1)   
McAfee
www.mcafee.com/stinger  (Windows XP SP2, 2003 SP2, Vista SP1, 2008, 7 and 8)
Microsoft
https://www.microsoft.com/security/scanner/en-us/default.aspx (Windows 8.1, Windows 8, Windows 7,
Windows Vista, and Windows XP) 
Sophos
https://www.sophos.com/VirusRemoval (Windows XP (SP2) and above) 
Symantec
https://www.symantec.com/connect/blogs/international-takedown-wounds-gameover-zeus-cybercrime-network
 (Windows XP, Windows Vista and Windows 7)
Trend Micro
https://www.trendmicro.com/threatdetector (Windows XP, Windows Vista, Windows 7, Windows 8/8.1,
Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2)
FireEye and Fox-IT
www.decryptcryptolocker.com
FireEye and Fox-IT have created a web portal claiming to restore/decrypt files of CryptoLocker victims. US-CERT has performed no evaluation of this claim, but is providing a link to enable individuals to make their own
https://www.us-cert.gov/ncas/alerts/TA14-150A
Page 2 of 3

determination of suitability for their needs. At present, US-CERT is not aware of any other product that claims
similar functionality.
The above are examples only and do not constitute an exhaustive list. The U.S. Government does not endorse or
support any particular product or vendor.
GOZ has been associated with the CryptoLocker malware. For more information on this malware, please
visit the CryptoLocker Ransomware Infections page.been associated with the Cryptolocker malware, for
more information on  that malware, please visit https://www.us-cert.gov/ncas/alerts/TA13-309A.
References
[1] Highly Resilient Peer-to-Peer Botnets Are Here: An Analysis of Gameover Zeus
[3] The Lifecycle of Peer-to-Peer (Gameover) ZeuS
Revisions
Initial Publication - June 2, 2014|Added McAfee - June 6, 2014|Added FireEye and Fox-IT web portal to
Solutions section - August 15, 2014
Source: https://www.us-cert.gov/ncas/alerts/TA14-150A
https://www.us-cert.gov/ncas/alerts/TA14-150A
Page 3 of 3