Skip to content

Export page to PDF
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: No
In the wild: Yes


This Trojan may be dropped by other malware.

It connects to certain websites to send and receive information.

Technical Details

File size: 49,026 bytes
Memory resident: Yes
Initial samples received date: 16 Apr 2013

Arrival Details

This Trojan may be dropped by the following malware:


Other Details

This Trojan connects to the following website to send and receive information:

  • http://www.{BLOCKED} numbers}
  • http://www.{BLOCKED} numbers}
  • http://www.{BLOCKED} numbers}
  • http://www.{BLOCKED}{random numbers}

This Google Chrome extension prevents the user from viewing the extensions page and just redirects the webpage to, thus preventing user from uninstalling the malicious extension.


Minimum scan engine: 9.300
First VSAPI Pattern File: 9.860.06
First VSAPI Pattern Release Date: 16 Apr 2013
VSAPI OPR Pattern Version: 9.861.00
VSAPI OPR Pattern Release Date: 17 Apr 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

Remove malware/grayware files that dropped/downloaded TROJ_EXTADB.US

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_EXTADB.US. 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.

Did this description help? Tell us how we did.
Analysis By: Adrianne Chester Camat

Connect with us on