Cybersecurity researchers have uncovered a significant threat affecting the internet's Domain Name System (DNS) infrastructure, known as the "Sitting Ducks" attack. This sophisticated method allows cybercriminals to hijack domains without needing access to the owner's account at the DNS provider or registrar.
Researchers from DNS security firm Infoblox and hardware protection company Eclypsium revealed that more than one million domains are vulnerable to this attack daily. This has resulted in over 35,000 confirmed domain hijackings, primarily due to poor domain verification practices by DNS providers.
The Sitting Ducks attack exploits misconfigurations at the registrar level and insufficient ownership verification. Attackers leverage these vulnerabilities to take control of domains through "lame" delegations, making the hijacking process more effective and harder to detect.
Once in control, these hijacked domains are used for malware distribution, phishing, brand impersonation, and data theft.
Russian threat actors have been particularly active, with twelve known cyber-gangs using this method since 2018 to seize at least 35,000 domains. These attackers often view weak DNS providers as "domain lending libraries," rotating control of compromised domains every 30-60 days to avoid detection.
The Sitting Ducks attack has been exploited by several cybercriminal groups. "Spammy Bear" hijacked GoDaddy domains in late 2018 for spam campaigns. "Vacant Viper" began using Sitting Ducks in December 2019, hijacking 2,500 domains yearly for the 404TDS system to distribute the IcedID malware and set up command and control (C2) domains. "VexTrio Viper" started using the attack in early 2020, employing the hijacked domains in a massive traffic distribution system (TDS) that supports the SocGholish and ClearFake operations.
Additionally, several smaller and unknown actors have used Sitting Ducks to create TDS, spam distribution, and phishing networks.
Despite the Sitting Ducks attack being reported in 2016, the vulnerability remains largely unresolved. This highlights the critical yet often neglected aspect of DNS security within broader cybersecurity efforts.
To effectively combat this pressing cybersecurity threat, a collaborative effort is essential involving domain holders, DNS providers, registrars, regulatory bodies, and the broader cybersecurity community. Infoblox and Eclypsium are playing a crucial role by partnering with law enforcement agencies and national Computer Emergency Response Teams (CERTs) to mitigate and diminish the impact of this critical security issue.
