Analysis by: Nikko Tamana
ALIASES:

Exploit.Win32.CVE-2011-3402.b (Kaspersky), Exploit:Win32/Anogre.gen!A (Microsoft), Exploit.Win32.CVE-2011-3402 (Ikarus), W32/CVE_2011_3402.B!exploit (Fortinet), Win32/Exploit.CVE-2011-3402.J (NOD32)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages. It may be hosted on a website and run when a user accesses the said website.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

It does not have any information-stealing capability.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 4,161 bytes
File Type: Other
Initial Samples Received Date: 20 Jan 2013

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

It is a zero-day exploit for the following vulnerability:

NOTES:

EXPL_ANOGRE.AN is the Trend Micro detection for specially crafted TrueType fonts which affects Windows kernel-mode drivers. When the vulnerability is exploited, it allows execution of remote code in the context of kernel.

Once a malware successfully exploits the said vulnerability, it causes the following actions to be done on the system:

  • Shell execution
  • Provide elevation of privilege to its main component

For more information about this vulnerability, visit the following pages:

It does not have rootkit capabilities.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.698.03
FIRST VSAPI PATTERN DATE: 20 Jan 2013
VSAPI OPR PATTERN File: 9.699.00
VSAPI OPR PATTERN Date: 21 Jan 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as EXPL_ANOGRE.AN. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 4

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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