JAVA_DLOADR.EFD

This is the detection for the Java zero-day exploit (designated with CVE-2015-2590) that was used in the targeted attack campaign, Operation Pawn Storm. Once successfully exploited, it downloads another malware detected as TROJ_DROPPR.CXC, which in turn, drops a SEDNIT variant.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

Operation Pawn Storm is an APT campaign that targeted military and defense contractors from the US and its allies among others. For more details on this targeted attack, read our entry, An In-Depth Look at How Pawn Storm’s Java Zero-Day Was Used.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

It executes downloaded files whose malicious routines are exhibited by the affected system.

It exploits a vulnerability identified as in a zero-day attack.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be hosted on a website and run when a user accesses the said website.

It may be downloaded from the following remote site(s):

• {Applet site location}\{BLOCKED}c.mcr

Download Routine

This Trojan executes downloaded files :

• %User Profile%\{Random characters}.exe (detected as TROJ_DROPPR.CXC )

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan exploits a zero-day vulnerability. More information on the said vulnerability can be found in the following pages:

• CVE-2015-2590

More information on this vulnerability can be found below:

• http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html