Detectionhightest
Suspicious PsExec Execution - Zeek
detects execution of psexec or paexec with renamed service name, this rule helps to filter out the noise if psexec is used for legit purposes or if attacker uses a different psexec client other than sysinternal one
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Launch
Samir Bousseaden, Tim SheltonCreated Thu Apr 02Updated Tue Dec 27f1b3a22a-45e6-4004-afb5-4291f9c21166network
Log Source
Zeek (Bro)smb_files
ProductZeek (Bro)← raw: zeek
Servicesmb_files← raw: smb_files
Detection Logic
Detection Logic2 selectors
detection:
selection:
path|contains|all:
- '\\'
- '\IPC$'
name|endswith:
- '-stdin'
- '-stdout'
- '-stderr'
filter:
name|startswith: 'PSEXESVC'
condition: selection and not filterFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
f1b3a22a-45e6-4004-afb5-4291f9c21166
Status
test
Level
high
Type
Detection
Created
Thu Apr 02
Modified
Tue Dec 27
Author
Path
rules/network/zeek/zeek_smb_converted_win_susp_psexec.yml
Raw Tags
attack.lateral-movementattack.t1021.002