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Outlook attachments causing "Exploit payload from UNC blocked"

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When in Outlook, clicking "Attach File," browsing, then clicking on the "Desktop" shortcut, Outlook is closed and Malwarebytes Anti-Exploit reports that an "Exploit Payload from UNC Blocked."

Detailed steps to replicate:

  1. Open Outlook (occurs with both 2013 and 2016)
  2. Create a new email.
  3. Click "Attach Files," (then "Browse this PC..." if in Outlook 2016)
  4. Click on the "Desktop" shortcut. (Navigating to the C:\Users\<username>\Desktop folder does not cause the problem; only clicking the shortcut does.)
  5. Outlook is immediately force-closed, and the user is presented with the dialog box in Attachment-1.png. (The "file/process blocked" is an EXE on a UNC share, that has been redacted for security reasons. The EXE is *not* a running program, but has been run by that computer in the past.)
  6. The user may then be prompted with the dialog box in Attachment-2.png. (The "following exploit file..." appears to be a randomly selected file located local to the computer. In both instances where I've seen this message, it's a PDF file. It is not the same file as in Attachment-1.png.)
  7. If the user has full permissions to the UNC share, the file from Attachment-1.png is removed from the server and quarantined.

Additionally, in the process of creating this post, I had the same thing happen from within Google Chrome when I tried attaching the picture.

Anti-Exploit is version on all affected computers.

This behavior was first noticed today (11/17/2016). The first report came in at 8:59 AM CST (2:59 PM UTC).

Any advice? Is this a new behavior in Anti-Exploit that is going awry?



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