Detecting Queries to "odd" DNS Servers
Usually, your operating system will be assigned a DNS server either via DHCP (or RAs in IPv6) or statically. The resolver library on a typical workstation will then go forward and pass all DNS lookups to this set of DNS servers. However, malware sometimes tries to use its own DNS servers, and blocking outbound port 53 traffic (udp and tcp) can help identify these hosts.
Brent, one of our readers, does just that and keeps finding infected machines that way. Just now, he is investigating a system that attempted to connect to the following name servers:
101.226.4.6
114.114.114.114
114.114.115.115
123.125.81.6
140.207.198.6
202.97.224.69
211.98.2.4
218.30.118.6
14.33.133.189
He has not identified the malware behind this yet, but no other system he is using ("we are running bluecoat web filter AND we're using OpenDNS AND I'm running snort"). Brent uses oak (http://ktools.org/oak/) to help him watch his logs and alert him of issues like this.
According to the Farsight Security passive DNS database, these IPs resolve to a number of "interesting" hostnames. I am just showing a few here (the full list is too long)
ns-facebook-[number]-[number].irl-dns.info <- the [number] part appears to be a random number
*.v9dns.com <- '*' to indicate various host names in this domain.
v2.3322pay.com
bjcgsm.com
sf5100.com
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Johannes B. Ullrich, Ph.D.
Comments
Anonymous
Dec 3rd 2022
9 months ago
Anonymous
Dec 3rd 2022
9 months ago
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<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
8 months ago