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Security Monitoring for Office365 SaaS Platform

ELK Stack
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Description:

Package for security monitoring of Microsoft Office365 SaaS ready for deployment on Elastic stack to detect incidents and security violations in the O365 platform. Includes Logstash configs for mapping to Elastic Common Schema (ECS) and 24+ threat detection content items covering 7 Techniques across 7 Tactics according to MITRE ATT&CK Enterprise.

Kibana Dashdoards:

  • Azure Active Directory
  • Exchange
  • OneDrive
  • SharePoint

Elasticsearch Watchers:

  • [Office365] Add admin role (Added a user to an admin role in Office 365)
  • [Office365] Anonymizer tools detected (An anonymizer or an anonymous proxy is a tool that attempts to make activity on the Internet untraceable.)
  • [Office365] Connection with a suspicious user agent (May be used for direct download via Powershell or other tools)
  • [Office365] Cryptominer tools detected (Detects the mining tools)
  • [Office365] Malware detection (SharePoint anti-virus engine detects malware in a file.)
  • [Office365] Remote administration tools detected (Remote administration tool is software that helps the administrator or attacker to receive full control of the targeted device.)
  • [Office365] Remove distribution group (Remove distribution groups and mail-enabled security groups)
  • [Office365] Suspicious group member change
  • [Office365] User password reset

Logstash Configs:

  • input.conf
  • filter.conf
  • output.conf

Full list of Watchers is available at tdm.socprime.com

MITRE ATT&CK tags:

  • Brute Force T1110
    Adversaries may use brute force techniques to attempt access to accounts when passwords are unknown or when password hashes are obtained. Credential Dumping is used to obtain password hashes, this may only get an adversary so far when Pass the Hash is not an option. Techniques to systematically guess the passwords used to compute hashes are available, or the adversary may use a pre-computed rainbow table to crack hashes. Cracking hashes is usually done on adversary-controlled systems outside of the target network. Adversaries may attempt to brute force logins without knowledge of passwords or hashes during an operation either with zero knowledge or by attempting a list of known or possible passwords. This is a riskier option because it could cause numerous authentication failures and account lockouts, depending on the organization's login failure policies. A related technique called password spraying uses one password (e.g. 'Password01'), or a small list of passwords, that matches the complexity policy of the domain and may be a commonly used password. Logins are attempted with that password and many different accounts on a network to avoid account lockouts that would normally occur when brute forcing a single account with many passwords. Typically, management services over commonly used ports are used when password spraying. Commonly targeted services include the following: * SSH (22/TCP) * Telnet (23/TCP) * FTP (21/TCP) * NetBIOS / SMB / Samba (139/TCP & 445/TCP) * LDAP (389/TCP) * Kerberos (88/TCP) * RDP / Terminal Services (3389/TCP) * HTTP/HTTP Management Services (80/TCP & 443/TCP) * MSSQL (1433/TCP) * Oracle (1521/TCP) * MySQL (3306/TCP) * VNC (5900/TCP) In default environments, LDAP and Kerberos connection attempts are less likely to trigger events over SMB, which creates Windows "logon failure" event ID 4625.
  • Remote File Copy T1105
    Files may be copied from one system to another to stage adversary tools or other files over the course of an operation. Files may be copied from an external adversary-controlled system through the Command and Control channel to bring tools into the victim network or through alternate protocols with another tool such as FTP. Files can also be copied over on Mac and Linux with native tools like scp, rsync, and sftp. Adversaries may also copy files laterally between internal victim systems to support Lateral Movement with remote Execution using inherent file sharing protocols such as file sharing over SMB to connected network shares or with authenticated connections with Windows Admin Shares or Remote Desktop Protocol.
  • Network Service Scanning T1046
    Adversaries may attempt to get a listing of services running on remote hosts, including those that may be vulnerable to remote software exploitation. Methods to acquire this information include port scans and vulnerability scans using tools that are brought onto a system.
  • Account Manipulation T1098
    Account manipulation may aid adversaries in maintaining access to credentials and certain permission levels within an environment. Manipulation could consist of modifying permissions, modifying credentials, adding or changing permission groups, modifying account settings, or modifying how authentication is performed. These actions could also include account activity designed to subvert security policies, such as performing iterative password updates to subvert password duration policies and preserve the life of compromised credentials. In order to create or manipulate accounts, the adversary must already have sufficient permissions on systems or the domain.
  • Automated Exfiltration T1020
    Data, such as sensitive documents, may be exfiltrated through the use of automated processing or Scripting after being gathered during Collection. When automated exfiltration is used, other exfiltration techniques likely apply as well to transfer the information out of the network, such as Exfiltration Over Command and Control Channel and Exfiltration Over Alternative Protocol.
  • Data Staged T1044
    Collected data is staged in a central location or directory prior to Exfiltration. Data may be kept in separate files or combined into one file through techniques such as Data Compressed or Data Encrypted. Interactive command shells may be used, and common functionality within cmd and bash may be used to copy data into a staging location.
  • User Execution T1204
    An adversary may rely upon specific actions by a user in order to gain execution. This may be direct code execution, such as when a user opens a malicious executable delivered via Spearphishing Attachment with the icon and apparent extension of a document file. It also may lead to other execution techniques, such as when a user clicks on a link delivered via Spearphishing Link that leads to exploitation of a browser or application vulnerability via Exploitation for Client Execution. While User Execution frequently occurs shortly after Initial Access it may occur at other phases of an intrusion, such as when an adversary places a file in a shared directory or on a user's desktop hoping that a user will click on it.

Other integrations: