Sigma rule: Suspicious SysAidServer Child

Rule

Title

Suspicious SysAidServer Child

Status

test

Level

medium

Author

Florian Roth (Nextron Systems)

Date

2022-08-26

File

rules/windows/process_creation/proc_creation_win_java_sysaidserver_susp_child_process.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious child processes of SysAidServer (as seen in MERCURY threat actor intrusions)

Log source

product

windows

category

process_creation

Detection

selection:
    ParentImage|endswith:
        - '\java.exe'
        - '\javaw.exe'
    ParentCommandLine|contains: 'SysAidServer'
condition: selection

False positives (as the rule lists them)

• Unknown

Tags

• attack.lateral-movement
• attack.t1210

MITRE ATT&CK ids this rule names

• T1210

References

• https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/

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_java_sysaidserver_susp_child_process.yml