Virus Profile: Exploit-FCM!B859C28388C2

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 1/23/2013
Date Added: 1/23/2013
Origin: Unknown
Length: N/A
Type: Trojan
Subtype: -
DAT Required: N/A
Removal Instructions


This is a Trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

 Aliases –

  • F-Secure - Exploit.Java.CVE-2012-0507.N
  • Microsoft - Exploit:Java/CVE-2012-0507.D!ldr
  • NOD32 - Java/Exploit.CVE-2012-0507.D
  • Sophos - Exp/20120507-A


Indication of Infection

Presence of above mentioned activities.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.


Virus Characteristics

Exploit-FCM!B859C28388C2  is the exploit corresponds to the vulnerability ‘CVE-2012-0507’

It  is the detection for a malicious Java class files stored within a Java archive (.JAR) , which attempts to exploit a vulnerability in the Java Runtime Environment (JRE) up to and including versions 5 update 33,version 6 update 30 and version 7 update 2.

This exploit may be encountered when visiting a compromised webpage that contains the malicious code.

The code is created by an attacker using the "Blackhole" Exploit Kit and inserted into a compromised webpage.

When the page is visited by a user running vulnerable versions of Java, the malicious Java class runs and allows the execution of arbitrary code.The vulnerability exploits a flaw in the deserialization of "AtomicReferenceArray" objects, which allows remote attackers to call system level Java functions via the ClassLoader of a constructor that is being deserialized without proper sandboxing.

The attacker may host a malicious script on a website. If a user visits the site, the script loads the Java applet.

The malicious Java package may contain the following malicious Java class files:

  • neb.class
  • yaw.class

The file neb.class triggers the vulnerability. The method init() builds the object  AtomicReferenceArray for the execution of malicious Java code outside the sandbox.
And the other one (yaw.class) is a loader class which creates another class (Eg: C.class) file at runtime and loads.

This class (C.class) downloads malware from a certain server and executes it.


All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).


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