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#BASHed Evolution Of Shellshock Attack Payloads

ID: 07628466-9eeb-5d27-b2fc-5a9b3bc84703

STIX ID: report--07628466-9eeb-5d27-b2fc-5a9b3bc84703

Feed Name: Zscaler Security Research Blog

Threat Score
75/100

Date Published: 2025-04-02

Date Updated: 2026-05-01

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Zscaler ThreatLabZ reports active Shellshock (CVE-2014-6271) exploit activity delivering Perl IRC bots and Linux.Tsunami DDoS malware; attackers employ persistence (cronjobs), evasion (Base64 and plain-text source transfer), stealth (clearing bash history and shredding scripts), and even attempt to patch compromised hosts to block competitors—administrators should patch Bash and check for the described IOCs.

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