Cyber risk and advisory programs that identify security gaps and build strategies to address them.
MDR that provides improved detection, 24/7 threat hunting, end-to-end coverage and most of all, complete Response.
Our team delivers the fastest response time in the industry. Threat suppression within just 4 hours of being engaged.
Be protected by the best from Day 1.
24/7 Threat Investigation and Response.
Expert hunting, research and content.
Defend brute force attacks, active intrusions and unauthorized scans.
Safeguard endpoints 24/7 by isolating and remediating threats to prevent lateral spread.
Investigation and enhanced threat detection across multi-cloud or hybrid environments.
Configuration escalations, policy and posture management.
Detects malicious insider behavior leveraging Machine Learning models.
Customer testimonials and case studies.
Stories on cyberattacks, customers, employees, and more.
Cyber incident, analyst, and thought leadership reports.
Demonstrations, seminars and presentations on cybersecurity topics.
Information and solution briefs for our services.
MITRE ATT&CK Framework, Cybersecurity Assessment, SOC Calculator & more
eSentire Threat Intelligence team is aware of recent attempts to target C-level and finance employees across multiple eSentire customers. These multistage attacks rely on Business Email Compromise (BEC) in order to impersonate users and facilitate wire fraud.
Employees, particularly those handling payments, are encouraged to review the recent eSentire advisory on Office 365 related phishing and remain vigilant of email-based threats . Network administrators are advised to review the below guidance on limiting the impact of BEC through detective and preventative controls in Office 365.
What we’re doing about it
What you should do about it
Employees Responsible for Financial Transactions
eSentire is aware of recent customer incidents involving BEC schemes. Employees responsible for financial transactions were targeted with credential phishing. Attempts were then made to gather payment related emails and initiate fraudulent financial transactions.
Recent customer incident: Finance employee compromised
In this incident, credentials for a finance employee were used to obtain payment related emails for the target organization.
This organization did have Azure MFA enabled; however, the attacker initiated the second authentication step using the phone call option shown here:
[image src="/assets/93107a2e85/img1.jpg" id="2400" width="400" height="215" class="center ss-htmleditorfield-file image" title="img1"]
Figure 1: Screengrab Showing Alternative Identity Verification Steps
The victim received the call via their work phone and followed the voice prompts to approve the identity verification request. The phone call was not reported by the employee as it was not deemed suspicious.
Once access to the victim’s account was obtained, mail forwarding rules were created by the attacker to reroute payment related emails to an external address:
[image src="/assets/cd01b28e1c/img2.jpg" id="2401" width="400" height="103" class="center ss-htmleditorfield-file image" title="img2"]
Figure 2: Mail Rule Created by Attacker. Forwards Payment Related Emails to External Address.
Subsequent email exfiltration was flagged by Office 365 and remediation steps were taken.
Additional Guidance for Employees
Suspicious MFA Requests
As demonstrated above, attackers can initiate a push notification in the Microsoft Authenticator app or phone call in hopes that the target will blindly approve it.
Neither method provides sufficient context (see Figure 3 for push notification example), and users are advised to deny and report the request if they did not initiate it themselves or if they are unsure.
[image src="/assets/7644626e8a/img3.jpg" id="2402" width="251" height="418" class="center ss-htmleditorfield-file image" title="img3"]
Figure 3: MFA Push Notification Example in Microsoft Authenticator
Additional Guidance for Office 365 Administrators
Blocking creation of mail forwarding rules to external addresses in Office 365
If auto-forwarding emails to accounts outside of your organization is not a business requirement, administrators can block the creation of email forwarding rules to external domains. For step by step instructions on how to disable auto-forwarded email rules, see the official Microsoft Office Support documentation .
Detection of suspicious mail forwarding rules in Office 365
Office 365 offers administrators an Auto-Forward Messages Report which can be used to identify suspicious auto-forward rules. The dashboard illustrates new domain forwarding rules along with the user accounts that implemented the rule. See the official Microsoft guidance for detail instructions .
[image src="/assets/097accaa45/img4.jpg" id="2403" width="400" height="333" class="center ss-htmleditorfield-file image" title="img4"]
Figure 4: Office 365 Mail Flow Dashboard: Image taken from https://docs.microsoft.com/en-us/office365/securitycompliance/mfi-auto-forwarded-messages-report
Azure Active Directory Identity Protection
Azure Active Directory Identity Protection is used to identify compromised accounts through anomaly detection; such as login location or unknown device. This feature requires an Azure AD Premium P2 license.