Sigma rule: HackTool - KrbRelayUp Execution

Rule

Title

HackTool - KrbRelayUp Execution

Status

test

Level

high

Author

Florian Roth (Nextron Systems)

Date

2022-04-26

Modified

2023-02-04

File

rules/windows/process_creation/proc_creation_win_hktl_krbrelayup.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects KrbRelayUp used to perform a universal no-fix local privilege escalation in Windows domain environments where LDAP signing is not enforced

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith: '\KrbRelayUp.exe'
    - OriginalFileName: 'KrbRelayUp.exe' # In case the file has been renamed after compilation
selection_cli_1:
    CommandLine|contains|all:
        - ' relay '
        - ' -Domain '
        - ' -ComputerName '
selection_cli_2:
    CommandLine|contains|all:
        - ' krbscm '
        - ' -sc '
selection_cli_3:
    CommandLine|contains|all:
        - ' spawn '
        - ' -d '
        - ' -cn '
        - ' -cp '
condition: 1 of selection_*

False positives (as the rule lists them)

• Unlikely

Tags

• attack.credential-access
• attack.t1558.003
• attack.lateral-movement
• attack.t1550.003

MITRE ATT&CK ids this rule names

• T1550.003
• T1558.003

References

• https://github.com/Dec0ne/KrbRelayUp

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_hktl_krbrelayup.yml