Black Arrow Cyber Advisory 28 March 2023 – DEV-1101 Automated AiTM Phishing Campaigns Bypassing MFA
Executive Summary
Microsoft Threat intelligence team has recently exposed the activities of a threat actor named DEV-1101. This threat actor advertises an open-source phishing kit that can be deployed to automate Adversary-in-the-middle (AiTM) campaigns. The phishing kit has the capability to circumvent multifactor authentication (MFA), evade detection through an antibot database, manage the phishing activity through telegram bots, and mimics services such as Microsoft Office or Outlook.
What’s the risk to me or my business?
If an AiTM phishing campaign is successful, the actor can set up a malicious site that will act as the intended valid website such as Microsoft Office or Microsoft Outlook. Here it can steal the credentials of the user and steal the authenticated session tokens of the MFA. In the most severe situations this can lead to a loss of confidentiality, integrity or availability of affected systems as the attacker has free access to perform any further criminal activity such as stealing, corrupting or and deleting data. Alongside the impact of the compromise, this can also lead to reputational damage and potentially financial penalties.
What can I do?
Black arrow recommends that you always deploy and maintain MFA where possible. While certain certain attacks may be able to circumvent MFA, it is important to remember that strong cyber security controls involve having layers of defences, in this case Conditional Access could be used to supplement the MFA control could reduce the risk of compromise. Organisations should also look to implement continuous monitoring for suspicious and anomalous activity to identify indicators of compromise. Other actions can be to ensure software and operating systems are up to date to avoid common vulnerabilities to be exploited. It is also vital that this is supplemented with end-user training including phishing simulations as this is the ingress point for this type of attack. Users should be encouraged to report any instances of interactions with emails that do not seem right.
Further information on the attack method can be found here:
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