Analysis by: Mark Joseph Manahan


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


  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes


This malware exploits a zero-day vulnerability in some versions of Internet Explorer. Once successfully exploited, it drops a backdoor on the vulnerable computer. As a result, routines of the backdoor are also exhibited on the computer.

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

This Trojan may arrive using one or multiple arrival methods.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It takes advantage of certain vulnerabilities.


File Size: 16,587 bytes
File Type: SWF
Memory Resident: Yes
Initial Samples Received Date: 14 Feb 2014
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives via the following means:

  • Loaded by HTML_EXPLOIT.PB

Download Routine

This Trojan accesses the following websites to download files:

  • {URL Hosted}\Erido.jpg

It saves the files it downloads using the following names:

  • %User Temp%\sqlrenew.txt
  • %User Temp%\stream.exe - detected as BKDR_ZXSHELL.V

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan takes advantage of the following vulnerabilities:

  • CVE-2014-0322


Minimum Scan Engine: 9.700
VSAPI OPR PATTERN File: 10.607.00
VSAPI OPR PATTERN Date: 15 Feb 2014

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 the malware/grayware file that dropped/downloaded SWF_EXPLOIT.PB

Step 3

Remove the malware/grayware file dropped/downloaded by SWF_EXPLOIT.PB

Step 4

Close all opened browser windows

Step 5

Scan your computer with your Trend Micro product to delete files detected as SWF_EXPLOIT.PB 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 6

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.

  • Upgrade to Internet Explorer 11
  • Install Microsoft’s Enhanced Mitigation Experience Toolkit (EMET)

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