Detectionhightest
HackTool - KrbRelay Execution
Detects the use of KrbRelay, a Kerberos relaying tool
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Launch
Florian Roth (Nextron Systems)Created Wed Apr 27Updated Sat Feb 04e96253b8-6b3b-4f90-9e59-3b24b99cf9b4windows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic4 selectors
detection:
selection_img:
- Image|endswith: '\KrbRelay.exe'
- OriginalFileName: 'KrbRelay.exe' # In case the file has been renamed after compilation
selection_cli_1:
CommandLine|contains|all:
- ' -spn '
- ' -clsid '
- ' -rbcd '
selection_cli_2:
CommandLine|contains|all:
- 'shadowcred'
- 'clsid'
- 'spn'
selection_cli_3:
CommandLine|contains|all:
- 'spn '
- 'session '
- 'clsid '
condition: 1 of selection_*False Positives
Unlikely
False positives are unlikely for most environments. High confidence detection.
References
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
e96253b8-6b3b-4f90-9e59-3b24b99cf9b4
Status
test
Level
high
Type
Detection
Created
Wed Apr 27
Modified
Sat Feb 04
Path
rules/windows/process_creation/proc_creation_win_hktl_krbrelay.yml
Raw Tags
attack.credential-accessattack.t1558.003