It defeated/can defeat the Web Security Gateway (SWG), IPS / IDS and Sandbox. Note that DNS traffic itself can also be used as a communication channelįorging header information can confuse the true destination of the data, so it can bypass defensive measures against known C&C server addresses.The log files of your internal DNS server are a crucial source of information.Look for repeated requests for domains belonging to a dynamic DNS service.Look for repeated requests for domains belonging to a dynamic DNS service or requests for URL shortener domains.Look for Alerts on DNS queries for domains that have only recently been registered.Look for DNS responses that have a very low time to live (TTL).Be aware that this can also generate lots of false positives due to content delivery networks (CDNs)
Statistics for DNS queries on the full qualified domain name (FQDN) focusing on the second-level domain.It defeated/can defeat the Web Security Gateway (SWG), Terminal Detection Response (EDR) and Sandbox.ġ> Domain Name System (DNS) to resolve a C&C server address. Malware with domain generation capabilities can periodically modifying C&C address details and using unknown addresses. Manually visit the IP under isolated environment and latest browser to poke around and know more.Identify the IP string and push it to a service detecting if the IP resolves to any domain and if the domain is safe/suspicious or not.Hopefully below information serves help.Ġ> Direct IP connections, typically for malware that doesn’t make use of DNS. I have generalized some info because I am no expert in malware analysis. What are the techniques to detect malware call home/beaconingĪs we discussed in the comments sir, following are the broad known ways to hide malware network communications followed by ways to detect them.
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