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SWF_LOADER.EHL
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
Encrypted: Yes
In the wild: Yes

Overview


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

This Trojan may be downloaded by other malware/grayware from remote sites.

Technical Details


File size: 8,002 bytes
File type: SWF
Initial samples received date: 07 May 2012
Payload: Drops files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_SCRIPBRID.A

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}ups.com/update/top.swf

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities to drop malicious files:

NOTES:

It is a SWF component of a dropper document malware that is detected by Trend Micro as TROJ_SCRIPBRID.A.

It aids in extracting, decrypting and executing an embedded malicious executable file in TROJ_SCRIPBRID.A's body. As a result, malicious routines of the extracted malicious file are also exhibited on the affected system.

Trend Micro detects the extracted executable as BKDR_INJECT.EVL.

Solution


Minimum scan engine: 9.200
First VSAPI Pattern File: 8.978.07
First VSAPI Pattern Release Date: 07 May 2012
VSAPI OPR Pattern Version: 8.979.00
VSAPI OPR Pattern Release Date: 08 May 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware/grayware files that dropped/downloaded SWF_LOADER.EHL

Step 3

Remove malware/grayware files dropped/downloaded by SWF_LOADER.EHL

Step 4

Scan your computer with your Trend Micro product to delete files detected as SWF_LOADER.EHL. 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 5

Download and apply these security patches 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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Analysis By: Roland Marco Dela Paz

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