Sharing Private Data with Webcast Invitations
Last week, at a customer, we received a forwarded email in a shared mailbox. It was somebody from another department that shared an invitation for a webcast “that could be interesting for you, guys!”. This time, no phishing attempt, no malware, just a regular email sent from a well-known security vendor. A colleague was interested in the webcast and clicked on the registration link. He was redirected to a page and was surprised to see all the fields already prefilled with the personal details of the original recipient:
- Name
- Organization
- Direct phone number
The link has this format:
http://go.<redacted>.com/CZL00H0wd04C0hkE140jP06
When you visit this link, based on the URI, it expands to the complete registration URL. Even if invitations are usually nominative, people share often webcast invitations with peers who can be located internally, in restricted groups or... the wild Internet (forums, mailing lists, etc). Just for the story, all communications occurred via HTTP.
It was tempting to search on Google for similar URLs:
intext:"go.<redacted>.com/"
I found 31 hits containing an URL of the same format. Let’s test some of them… The online form for the other webcast session was indeed prefilled but... with the same values (the one of the first colleague). Hmmm… Let’s see if we have some cookies maybe? Yes, we have! Let’s clear them, refresh the page and the URL decodes personal details of the attendee:
After more investigation, I found some links of the same format posted on Twitter:
Such information are a gold mine to set up a spear phishing attack! The attacker knows your details, your interests in the <vendor> products and that you attended a webinar on a specific date. Keep this in mind when sharing invitations outside a restricted audience!
Xavier Mertens (@xme)
ISC Handler - Freelance Security Consultant
PGP Key
Comments
Anonymous
Dec 3rd 2022
10 months ago
Anonymous
Dec 3rd 2022
10 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
9 months ago
Anonymous
Dec 26th 2022
9 months ago
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<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
9 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
9 months ago
Anonymous
Dec 26th 2022
9 months ago
https://defineprogramming.com/
Dec 26th 2022
9 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
9 months ago
rthrth
Jan 2nd 2023
9 months ago