Analysis by: Michael Cabel
 PLATFORM:

Mac OS X

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This malware was involved in a zero-day Java vulnerability exploit attack in January 2013. Its backdoor routines allow remote attackers to perform commands on the affected system, which may compromise the system's security.

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

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

  TECHNICAL DETAILS

File Size: 695,044 bytes
File Type: Mach-O
Memory Resident: No
Initial Samples Received Date: 19 Feb 2013
Payload: Compromises system security

Arrival Details

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

Backdoor Routine

This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}pl.com

NOTES:

This backdoor opens a reverse shell to wait for commands from the remote malicious user.

It is a modified version of SSH daemon used to encrypt the network traffic to avoid easy detection. It encrypts the traffic with the remote server using RSA private key. This version is also modified so that the command history is not to be logged.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.738.03
FIRST VSAPI PATTERN DATE: 19 Feb 2013
VSAPI OPR PATTERN File: 9.739.00
VSAPI OPR PATTERN Date: 20 Feb 2013

Scan your computer with your Trend Micro product to delete files detected as OSX_PINTSIZED.ENV. 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.


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