Adversaries may perform calculations on addresses returned in DNS results to determine which port and IP address to use for command and control, rather than relying on a predetermined port number or the actual returned IP address. A IP and/or port number calculation can be used to bypass egress filtering on a C2 channel.[1]
One implementation of DNS Calculation is to take the first three octets of an IP address in a DNS response and use those values to calculate the port for command and control traffic.[1],[2],[3]
References
- Meyers, A. (2013, March 29). Whois Numbered Panda. Retrieved January 14, 2016.
- Moran, N., Oppenheim, M., Engle, S., & Wartell, R.. (2014, September 3). Darwin’s Favorite APT Group [Blog]. Retrieved November 12, 2014.
- Rapid7. (2013, August 26). Upcoming G20 Summit Fuels Espionage Operations. Retrieved March 6, 2017.
Propojené úkoly
| Typ vazby | Úkol |
|---|---|
| is related to | Techniques |
| is blocked by | Detection Strategy for Dynamic Resolution through DNS Calculation |
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