OSX_EXPLOIT.B

 Analysis by: Rhena Inocencio

 ALIASES:

OSX/CallMe.C trojan (NOD32), MACOS/CVE2009-0563.C (Antivir), OSX/Agent.AADL (Fortinet), OSX/Agent-AADL (Sophos)

 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


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. It may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

108,220 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

30 Apr 2013

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.

It may be dropped by the following malware:

  • TROJ_MDROP.OSX

Installation

This backdoor drops the following component file(s):

  • /tmp/__system
  • /Library/LaunchDaemons/systm
  • ~/Library/Application Support/.realPlayerUpdate
  • ~/Library/launchagents/realPlayerUpdate.plist
  • /Library/Application Support/.realPlayerUpdate
  • /Library/LaunchDaemons/realPlayerUpdate.plist

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Execute remote shell commands
  • Download and Upload files

It connects to the following websites to send and receive information:

  • alma.apple.{BLOCKED}ns.org

Information Theft

This backdoor gathers the following information on the affected computer:

  • user's contact information

Stolen Information

This backdoor saves the stolen information in the following file:

  • /tmp/tmpAdressbook.vcf - contains user's contact information

NOTES:

Its communication with the Command-and-Control (C&C) server is encrypted with AES key 12345678

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.888.04

FIRST VSAPI PATTERN DATE:

30 Apr 2013

VSAPI OPR PATTERN File:

9.889.00

VSAPI OPR PATTERN Date:

30 Apr 2013

Step 1

Remove the malware/grayware file that dropped/downloaded OSX_EXPLOIT.B

     
    • TROJ_MDROP.OSX

Step 2

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • ~/Library/Application Support/.realPlayerUpdate
  • ~/Library/launchagents/realPlayerUpdate.plist
  • /Library/Application Support/.realPlayerUpdate
  • /Library/LaunchDaemons/realPlayerUpdate.plist
  • /Library/LaunchDaemons/systm
  • /tmp/tmpAdressbook.vcf

Step 3

Scan your computer with your Trend Micro product to delete files detected as OSX_EXPLOIT.B. 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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