Attackers Disrupt Strong Authentication to Steal Credentials
The Israel National Cyber Directorate (INCD) has issued a warning regarding a sophisticated cyberattack technique that targets an organization’s strong authentication mechanisms. Recently, the INCD was alerted to an incident where attackers launched a denial-of-service (DoS) attack against the server responsible for strong authentication. The objective was to disable the primary, robust authentication process, thereby forcing the system to fall back to a weaker, secondary authentication method.
By successfully disrupting the strong authentication, attackers aimed to exploit the weaker backup mechanism to gain unauthorized access and potentially steal user credentials. This advisory serves to inform organizations about this specific attack vector and provide guidance on how to mitigate such threats. The INCD emphasizes the importance of recognizing this modus operandi to protect sensitive organizational data.
Attached Files:
What This Means For You
- Implement robust monitoring and alerting for DoS attacks specifically targeting authentication servers, and ensure that fallback authentication mechanisms are as secure as the primary ones, or are disabled entirely if not adequately protected.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules mapped to MITRE ATT&CK. Free Sigma YAML below.
Credential Abuse from Breached Vendor — Attackers Disrupt Strong Authentication to Steal Credentials
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| INCD Advisory | DoS | Denial-of-service (DoS) attack against the server responsible for strong authentication |
| INCD Advisory | Auth Bypass | Disrupting strong authentication to force fallback to weaker secondary authentication |
Source & Attribution
| Source Platform | INCD |
| Channel | Israel National Cyber Directorate |
| Channel ID | incd |
| Message ID | 1990 |
| Published | April 20, 2026 at 15:00 UTC |
| Original Link | https://www.gov.il/he/pages/alert_1990 |
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