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    FortiBleed Default Fortinet Account Credential Reuse Against VPN

    avatar
    GlassDiceBearhttps://www.dicebear.comhttps://creativecommons.org/publicdomain/zero/1.0/„Glass” (https://www.dicebear.com) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)
    Arnold Chan@slaz
    •updated Sep 15, 2026•0•0•0

    Detects high-volume authentication attempts against Fortinet network appliances where multiple distinct source IPs successfully authenticate against multiple distinct accounts matching specific administrative naming patterns. This pattern is indicative of potential credential stuffing or brute-force campaigns targeting edge infrastructure.

    Microsoft Sentinel (KQL)

    Tags

    T1110 - Brute ForceT1110.003 - Password SprayingFirewall EventAuthentication SuccessAuthentication AttemptNetwork Connection InboundNetwork GenericFortinet Fortigate Firewallkql

    Found in

    • Rise of Agentic Ransomware: JADEPUFFER and FortiBleedLast updated Sep 15, 2026
    • Rise of Agentic Ransomware: JADEPUFFER and FortiBleedLast updated Sep 15, 2026
    • Rise of Agentic Ransomware: JADEPUFFER and FortiBleedLast updated Sep 15, 2026
    • Rise of Agentic Ransomware: JADEPUFFER and FortiBleedLast updated Sep 15, 2026
    • Rise of Agentic Ransomware: JADEPUFFER and FortiBleedLast updated Sep 15, 2026

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