Detection rules › Sigma
Suspicious File Created by ArcSOC.exe
Detects instances where the ArcGIS Server process ArcSOC.exe, which hosts REST services running on an ArcGIS server, creates a file with suspicious file type, indicating that it may be an executable, script file, or otherwise unusual.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1133 External Remote Services |
| Execution | T1127 Trusted Developer Utilities Proxy Execution |
| Persistence | T1133 External Remote Services |
| Stealth | T1127 Trusted Developer Utilities Proxy Execution |
| Command & Control | T1105 Ingress Tool Transfer |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 11 | FileCreate |
Rule body yaml
title: Suspicious File Created by ArcSOC.exe
id: e890acee-d488-420e-8f20-d9b19b3c3d43
status: experimental
description: |
Detects instances where the ArcGIS Server process ArcSOC.exe, which hosts REST services running on an ArcGIS
server, creates a file with suspicious file type, indicating that it may be an executable, script file,
or otherwise unusual.
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
author: Micah Babinski
date: 2025-11-25
tags:
- attack.command-and-control
- attack.persistence
- attack.initial-access
- attack.execution
- attack.stealth
- attack.t1127
- attack.t1105
- attack.t1133
logsource:
category: file_event
product: windows
detection:
selection:
Image|endswith: '\ArcSOC.exe'
TargetFilename|endswith:
- '.ahk'
- '.aspx'
- '.au3'
- '.bat'
- '.cmd'
- '.dll'
- '.exe'
- '.hta'
- '.js'
- '.ps1'
- '.py'
- '.vbe'
- '.vbs'
- '.wsf'
condition: selection
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith: '\ArcSOC.exe'
TargetFilename|endswith:
- '.ahk'
- '.aspx'
- '.au3'
- '.bat'
- '.cmd'
- '.dll'
- '.exe'
- '.hta'
- '.js'
- '.ps1'
- '.py'
- '.vbe'
- '.vbs'
- '.wsf'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Image | ends_with |
|
TargetFilename | ends_with |
|