413. Threat Actors Abuse Multiple Services for System Location Discovery

Hello everyone!

I hope you remember that collecting information about a compromised system is one of the most valuable stages from a threat hunting perspective. Today, let’s take a look at the following technique: System Location Discovery (T1614).

Quite often, malware uses various legitimate web services to obtain information about the IP address of a compromised system. In this case, the attackers used several of them, namely:

https://ipv4[.]ipleak[.]net/json/

https://get[.]geojs[.]io/v1/ip/geo[.]json

https://ipapi[.]co/json/

https://api[.]ipapi[.]is/

https://ipinfo[.]io/json

If some of these services are unfamiliar to you, they can serve as the basis for a hunting hypothesis, for example:

event_type: "dnsreqwin"

AND

dns_rname: ("ipv4.ipleak.net" OR "get.geojs.io" OR "ipapi.co" OR "api.ipapi.is" OR "ipinfo.io")

See you soon!

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