Containing an Executive Email Breach Before It Escalated
The Challenge
A global technology company engaged KITC after suspicious activity was detected in a senior executive's corporate email account and unauthorized transactions occurred in a cryptocurrency account linked to it.
The immediate priority was to determine whether the email account had been compromised, stop any continuing unauthorized access, and prevent additional financial loss. The company also needed to understand how the attacker gained access despite multi-factor authentication (MFA) being enabled.
The potential exposure extended beyond a single account. Continued access could allow an attacker to intercept financial communications, access sensitive business information, or use the compromised identity to target additional users.
KITC was brought in to contain the incident, investigate its source, identify weaknesses that contributed to the compromise, and help the organization strengthen its identity security.
Rapid Containment and Investigation
Within hours of engagement, KITC initiated coordinated triage and containment activities.
The team secured the compromised account, reset credentials, terminated active sessions, reviewed delegated access, and examined the account for malicious email rules and blocked senders. KITC also provided immediate guidance for securing financial accounts connected to the compromised email address.
Once the immediate threat was contained, KITC conducted a detailed forensic investigation of the company's Google Workspace environment. The team analyzed user access logs, OAuth activity, email filtering rules, login histories, MFA activity, and administrative audit logs to reconstruct the incident and determine how access had occurred.
The investigation identified malicious email filtering activity designed to interfere with legitimate communications and delay detection of the fraudulent activity.
Uncovering a Broader Identity Security Gap
The investigation also uncovered a significant issue extending beyond the compromised executive account.
KITC found that 53 user accounts were outside the group where MFA was enforced. Although MFA had been assumed to be broadly implemented, the group assignment issue created an organization-wide identity security gap that required immediate remediation.
Determining exactly what occurred during the executive's authentication presented another challenge. Google Workspace administrative logs appeared to indicate that the second authentication factor had not been completed. KITC escalated the issue to Google Workspace Support, which confirmed that MFA had been approved on the backend despite the conflicting information displayed in the administrative interface.
The investigation also identified limitations in the client's existing Google Workspace license that restricted access to certain forensic details. KITC worked through these visibility limitations and vendor escalation to clarify the authentication activity and give the client a more accurate understanding of the incident.
Expanding the Threat Hunt
KITC expanded the investigation beyond the compromised account to identify related threats to the organization.
During that work, the team discovered a spoofed internet domain designed to impersonate the company and potentially support phishing or credential-harvesting activity.
KITC coordinated an abuse report with the domain registrar, resulting in the spoofed domain being suspended within 72 hours.
Recovery and Security Hardening
After containing the immediate incident, KITC worked with the company to address the broader weaknesses identified during the investigation.
The organization corrected the MFA group assignment issue and brought all affected accounts under MFA enforcement. KITC provided detailed instructions for removing malicious email rules, restoring legitimate senders, and reviewing mail configurations for additional suspicious activity.
The team also advised the company on stronger authentication protections for executive and administrative accounts, including phishing-resistant hardware security keys, and evaluated options for implementing additional geographic access restrictions.
These actions addressed both the immediate compromise and security weaknesses that could have exposed other accounts to similar attacks.
The Results
Threat contained within hours. KITC rapidly secured the compromised account, terminated unauthorized access, and initiated forensic investigation and remediation activities.
53 accounts brought under MFA enforcement. The investigation uncovered an organization-wide enforcement gap affecting dozens of users, which was corrected as part of the response.
100% of identified malicious filtering rules removed the same day. KITC identified and eliminated email rules used to interfere with legitimate communications associated with the compromised account.
Spoofed domain suspended within 72 hours. KITC identified an impersonation domain and coordinated its takedown before it could be used for additional phishing or credential harvesting.
Additional financial accounts secured. KITC guided the client through securing financial accounts linked to the compromised email address following confirmed cryptocurrency-related fraud.
Zero recurrence of unauthorized logins during the 30-day post-remediation period. Following containment and remediation, no additional unauthorized login activity was detected during the documented follow-up period.
Improved visibility into authentication activity. KITC's escalation to Google helped resolve conflicting authentication information and identify limitations in the organization's existing forensic visibility.
From Incident Response to Stronger Identity Security
KITC's response extended beyond securing a single compromised account. The investigation identified an MFA enforcement gap affecting dozens of users, malicious email configurations, a spoofed domain, and limitations in the organization's ability to investigate authentication activity.
By containing the immediate threat and addressing the broader weaknesses uncovered during the investigation, KITC helped the company strengthen identity protections across its environment and reduce the risk of another targeted account takeover.
