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Category: Malware

Type: Trojan-Downloader

Aliases: Trojan-Downloader:W32/Oficla.AE, Gen:Variant.Bredo.4, Packed.Win32.Krap.an, TrojanDropper:Win32/Oficla (Microsoft), Win32/Oficla.GQ (Other) Mal/EncPk-NS (Sophos)


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


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details


Oficla.AE is distributed as executable or zipped files attached to misleading email messages. Some of the most common messages used to deliver this trojan involve fake offers for iTunes Gift certificates or for Amazon.com orders; other attachments are disguised as resumes.The text in the email 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.