title: Activity from Anonymous IP Addresses
id: d8b0a4fe-07a8-41be-bd39-b14afa025d95
status: test
description: Detects when a Microsoft Cloud App Security reported when users were active from an IP address that has been identified as an anonymous proxy IP address.
references:
    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
author: Austin Songer @austinsonger
date: 2021-08-23
modified: 2022-10-09
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    service: threat_management
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Activity from anonymous IP addresses'
        status: success
    condition: selection
falsepositives:
    - User using a VPN or Proxy
level: medium

title: Activity from Infrequent Country
id: 0f2468a2-5055-4212-a368-7321198ee706
status: test
description: Detects when a Microsoft Cloud App Security reported when an activity occurs from a location that wasn't recently or never visited by any user in the organization.
references:
    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
author: Austin Songer @austinsonger
date: 2021-08-23
modified: 2022-10-09
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    service: threat_management
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Activity from infrequent country'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium

title: Activity from Suspicious IP Addresses
id: a3501e8e-af9e-43c6-8cd6-9360bdaae498
status: test
description: |
  Detects when a Microsoft Cloud App Security reported users were active from an IP address identified as risky by Microsoft Threat Intelligence.
  These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.
references:
    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
author: Austin Songer @austinsonger
date: 2021-08-23
modified: 2022-10-09
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    service: threat_detection
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Activity from suspicious IP addresses'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium

title: Suspicious SSL Connection
id: 195626f3-5f1b-4403-93b7-e6cfd4d6a078
status: test
description: Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1573/T1573.md#atomic-test-1---openssl-c2
    - https://medium.com/walmartglobaltech/openssl-server-reverse-shell-from-windows-client-aee2dbfa0926
author: frack113
date: 2022-01-23
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - System.Net.Security.SslStream
            - Net.Security.RemoteCertificateValidationCallback
            - '.AuthenticateAsClient'
    condition: selection
falsepositives:
    - Legitimate administrative script
level: low