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.
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 Amazon.com 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:
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.