Threat Huntmediumexperimental
Mail Forwarding/Redirecting Activity Via ExchangePowerShell Cmdlet
Detects email forwarding or redirecting activity via ExchangePowerShell Cmdlet
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Launch
Nasreddine Bencherchali (Nextron Systems), Marco Pedrinazzi (InTheCyber)Created Sun Mar 010c7686d5-c74e-4292-b224-2a08e956ebc4windows
Hunting Hypothesis
Log Source
WindowsPowerShell Script
ProductWindows← raw: windows
CategoryPowerShell Script← raw: ps_script
Definition
Requirements: Script Block Logging must be enabled
Detection Logic
Detection Logic2 selectors
detection:
selection_cmdlet:
ScriptBlockText|contains:
- 'New-InboxRule'
- 'Set-InboxRule'
- 'Set-Mailbox'
selection_params:
ScriptBlockText|contains:
- 'ForwardAsAttachmentTo'
- 'ForwardingAddress'
- 'ForwardingSmtpAddress'
- 'ForwardTo'
- 'RedirectTo' # Also covers "RedirectToRecipients"
condition: all of selection_*False Positives
Legitimate mail forwarding rules created by users or administrators to forward email to designated internal or external recipients for business or operational purposes.
MITRE ATT&CK
Techniques
Other
detection.threat-hunting
Related Rules
SimilarThreat Huntmedium
Mail Forwarding/Redirecting Activity In O365
Detects email forwarding or redirecting activity in O365 Audit logs.
Detects similar activity. Both rules may fire on overlapping events.
Similar
Rule not found15b7abbb-8b40-4d01-9ee2-b51994b1d474
Rule Metadata
Rule ID
0c7686d5-c74e-4292-b224-2a08e956ebc4
Status
experimental
Level
medium
Type
Threat Hunt
Created
Sun Mar 01
Path
rules-threat-hunting/windows/powershell/powershell_script/posh_ps_email_forwarding_activity.yml
Raw Tags
attack.collectionattack.t1114.003attack.defense-evasionattack.t1564.008attack.exfiltrationattack.t1020detection.threat-hunting