IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
New ActiveSyncAllowedDeviceID Added via PowerShell
editNew ActiveSyncAllowedDeviceID Added via PowerShell
editIdentifies the use of the Exchange PowerShell cmdlet, Set-CASMailbox, to add a new ActiveSync allowed device. Adversaries may target user email to collect sensitive information.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- winlogbeat-*
- logs-windows.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Persistence
Version: 9 (version history)
Added (Elastic Stack release): 7.11.0
Last modified (Elastic Stack release): 8.4.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editLegitimate exchange system administration activity.
Investigation guide
editRule query
editprocess where event.type in ("start", "process_started") and
process.name: ("powershell.exe", "pwsh.exe", "powershell_ise.exe") and
process.args : "Set-CASMailbox*ActiveSyncAllowedDeviceIDs*"
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Account Manipulation
- ID: T1098
- Reference URL: https://attack.mitre.org/techniques/T1098/
Rule version history
edit- Version 9 (8.4.0 release)
-
- Formatting only
- Version 7 (8.2.0 release)
-
- Formatting only
- Version 6 (7.16.0 release)
-
-
Updated query, changed from:
process where event.type in ("start", "process_started") and process.name: ("powershell.exe", "pwsh.exe") and process.args : "Set- CASMailbox*ActiveSyncAllowedDeviceIDs*"
-
- Version 4 (7.15.0 release)
-
- Formatting only
- Version 3 (7.12.0 release)
-
- Formatting only
- Version 2 (7.11.2 release)
-
- Formatting only