Threat Description

Trojan-Downloader: W32/Oficla.AE


Category: Malware
Type: Trojan-Downloader
Platform: W32
Aliases: Trojan-Downloader:W32/Oficla.AE, Gen:Variant.Bredo.4,, TrojanDropper:Win32/Oficla (Microsoft), Win32/Oficla.GQ (Other) Mal/EncPk-NS (Sophos)


Trojan-Downloader:W32/Oficla.AE is distributed as an attachment to fake e-mail messages; once installed, the trojan-downloader connects to a remote server.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details


Oficla.AE is distributed as executable or zipped files attached to misleading e-mail messages. Some of the most common messages used to deliver this trojan involve fake offers for iTunes Gift certificates or for orders; other attachments are disguised as resumes.The text in the e-mail message entices the unsuspecting user to launch the attached file, which installs and executes the trojan.


Once the attached executable file is launched, the trojan creates the following files:

  • %Temp%\1.tmp
  • %System%\pgsb.lto

It also makes changes to the Windows Registry to ensure the installed copy is launched when the computer is started up.


Once installed on the computer, the trojan opens a connection to a remote server, from which it may download additional malicious programs.


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