Customer story

IT services / systems integratorMiddle EastAnonymized

Catching a helpdesk brute-force compromise before it became a company-wide breach

A regional IT services provider exposed its ServiceDesk login without rate limits. Unit6 spotted the shift from brute-force to successful use, shut it down, and rebuilt access controls.

MITRE T1110.001MITRE T1078MITRE T1556.001

The situation

An internet-facing ServiceDesk login with shared password patterns drew a burst of authentication attempts. Watcher Network telemetry showed the moment attackers moved from guessing to authenticated exploration.

What Unit6 detected

  • Concentrated brute-force activity against the ServiceDesk login page.
  • Follow-on human-driven interactions indicating at least one successful credential guess.
  • Post-login behavior mixing automated enumeration and manual exploration.

Why it mattered

  • Creation, modification, or deletion of tickets to obscure attacker actions.
  • Resetting passwords or granting access to other systems via IT workflows.
  • Access to internal incident history, infrastructure inventories, and employee details.
  • Impersonation of IT to phish employees or pivot into customer environments.

What Unit6 did

Immediate containment

  • Recommended disabling external access to the ServiceDesk login panel.
  • Revoked active sessions and forced password resets, prioritizing admins.

Compromise assessment

  • Reviewed login and application logs around the attack window.
  • Focused on new tickets, privilege changes, and password-reset actions.

Authentication and access control uplift

  • Introduced MFA and IP allowlisting for ServiceDesk users and admins.
  • Implemented rate limiting, CAPTCHA, and detection for repeated failed logins.

Threat hunting and follow-on defenses

  • Searched for new accounts, anomalous tickets, or configuration changes seeded by attackers.
  • Correlated attacker infrastructure with other Unit6 customers for fleet-wide protections.

Outcome

  • Compromise window narrowed with no evidence of large-scale lateral movement or customer impact.
  • ServiceDesk elevated from exposed target to strongly authenticated, monitored system.
  • Client showed customers they detected and contained an attack before broader incident.

Unit6 edge

  • Ability to separate background brute force from true compromise based on behavioral shifts.
  • Stepwise guidance security and IT operations could implement immediately.
  • Use of Watcher Network intelligence to track attacker infrastructure across tenants.

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