Office Protects You From Malicious ISO Files
A couple of weeks ago, Johannes gave me a malicious ISO file he had received: an ISO file containing a PE file.
And that made me wonder: "has Microsoft changed the behavior of Windows or Office when it handles untrusted ISO files?"
Years ago, at the ISC, we started to see malicious ISO files. Since Windows 10 (and later) supports mounting of ISO files, and that the "mark-of-web" is often not propagated to the contained files, it is a way to bypass Protected View in Office.
For example: create a maldoc (Word with VBA), put it inside an ISO file, and email the ISO file to your targets. The victims open the email & attachment: the attached ISO is saved to disk and marked as untrusted (coming from the Internet) and then opened. Then the victims open the contained Word document: it is not opened in Protected View, the yellow SECURITY WARNING banner appears immediately.
This behavior has changed now. If you are using Office 2021, or Office 2019 that you have updated since August 2021, then the document is now opened in ProtectedView:
Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com
Comments
Anonymous
Dec 3rd 2022
9 months ago
Anonymous
Dec 3rd 2022
9 months ago
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.
<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
Anonymous
Dec 26th 2022
8 months ago
Anonymous
Dec 26th 2022
8 months ago
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> nearest public toilet to me</a>
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
8 months ago
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> nearest public toilet to me</a>
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
8 months ago
Anonymous
Dec 26th 2022
8 months ago
https://defineprogramming.com/
Dec 26th 2022
8 months ago
distribute malware. Even if the URL listed on the ad shows a legitimate website, subsequent ad traffic can easily lead to a fake page. Different types of malware are distributed in this manner. I've seen IcedID (Bokbot), Gozi/ISFB, and various information stealers distributed through fake software websites that were provided through Google ad traffic. I submitted malicious files from this example to VirusTotal and found a low rate of detection, with some files not showing as malware at all. Additionally, domains associated with this infection frequently change. That might make it hard to detect.
https://clickercounter.org/
https://defineprogramming.com/
Dec 26th 2022
8 months ago
rthrth
Jan 2nd 2023
8 months ago