This is pretty funny. Also, block .IQY files at your mail gateways. We did earlier this year, no negative impact.https://twitter.com/ItsReallyNick/status/1029906804518658048 …
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Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.
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Kevin Beaumont Retweeted Nick Carr
This is pretty funny. Also, block .IQY files at your mail gateways. We did earlier this year, no negative impact.https://twitter.com/ItsReallyNick/status/1029906804518658048 …
Kevin Beaumont added,
take on an I agree with this advice if you are able to lock it down. Block .iqy, .cpl, .slk, and so on. Do you happen to know of a suspicious extension list? We still see .ms, .iqy, etc dropped from a PDF or DOC then executed. Also within compressed archives via email. But block if you can
A more effective strategy would be to block it at the MS Office Trust Center level, rather than via file extension. This way, there's no need to speculate about the various containers or channels through which an IQY may arrive. https://myonlinesecurity.co.uk/necurs-delivering-flawed-ammy-rat-via-iqy-excel-web-query-files/ …
While you're at it, you'll probably want to block "Text Files" as well. The IQY format is just a channel through which to load remote CSV content. So even if you block IQY and the like, an attacker can pull off the same attack with a .CSV file. Excel considers CSV as "Text File".
Does it load the content in same way?
Not sure what you're asking. The CSV PoC I tested is outlined here: http://georgemauer.net/2017/10/07/csv-injection.html … If I block "Text File", excel refuses to open a CSV (as opposed to opening it in Protected View, like the Trust Center words indicate). Otherwise, you get code exec after a few clicks.pic.twitter.com/WT3H8Mxqqw
This is the wording that the Office Trust Center uses. The way I parse those words is that based on this screen, Excel would open "Text File" types in Protected View. But as you can see from the prior screenshot, it simply refuses to open the file type.pic.twitter.com/D0HM2GoJ1f
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