Sigma rule: Suspicious ArcSOC.exe Child Process

Rule

Title

Suspicious ArcSOC.exe Child Process

Status

experimental

Level

high

Author

Micah Babinski

Date

2025-11-25

File

rules/windows/process_creation/proc_creation_win_arcsoc_susp_child_process.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects script interpreters, command-line tools, and similar suspicious child processes of ArcSOC.exe.
ArcSOC.exe is the process name which hosts ArcGIS Server REST services. If an attacker compromises an ArcGIS
Server system and uploads a malicious Server Object Extension (SOE), they can send crafted requests to the corresponding
service endpoint and remotely execute code from the ArcSOC.exe process.

Log source

product

windows

category

process_creation

Detection

selection:
    ParentImage|endswith: '\ArcSOC.exe'
    Image|endswith:
        - '\cmd.exe'
        - '\cscript.exe'
        - '\mshta.exe'
        - '\powershell.exe'
        - '\pwsh.exe'
        - '\regsvr32.exe'
        - '\rundll32.exe'
        - '\wmic.exe'
        - '\wscript.exe'
filter_main_cmd:
    Image|endswith: '\cmd.exe'
    CommandLine: 'cmd.exe /c "ver"'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.t1059
• attack.t1203

MITRE ATT&CK ids this rule names

• T1059
• T1203

References

• https://reliaquest.com/blog/threat-spotlight-inside-flax-typhoons-arcgis-compromise/
• https://enterprise.arcgis.com/en/server/12.0/administer/windows/inside-an-arcgis-server-site.htm

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_arcsoc_susp_child_process.yml