The threat determines what browser, operating system and the version of various applications you are using.
It checks if you have vulnerable versions of Internet Explorer, Microsoft Silverlight, Adobe Flash Player, or Java.
Exploits vulnerabilities in Internet Explorer and Microsoft Silverlight
If you're using Internet Explorer, the threat tries to exploit the vulnerability referred to as CVE-2013-2551.
The threat also checks if the Microsoft Silverlight plugin is installed and enabled. If it is, it tries to exploit the vulnerability referred to as CVE-2013-0074, which we detect as Exploit:MSIL/CVE-2013-0074.
Exploits vulnerabilities in Adobe Flash Player
The threat checks for vulnerabilities in Adobe Flash Player and tries to exploit the vulnerabilities referred to as CVE-2013-0634 (we detect this as Exploit:SWF/CVE-2013-0634) and CVE-2013-5329.
Exploits vulnerabilities in the
Java Runtime Environment
The threat checks for vulnerabilities in Java. We have observed it trying to exploit the vulnerability CVE-2013-2460, which we detect as Exploit:Java/CVE-2013-2460.
If the threat successfully exploits a vulnerability, it tries to download malware onto your PC. We have observed this threat trying to download files from the following URLs:
We have seen it try to download Ransom:Win32/Reveton.
This threat is part of the exploit kit called "Angler". See our page on exploits for more information.
Analysis by Stefan Sellmer
Alerts from your security software may be the only symptom.