Suspicious File Created by ArcSOC.exe

Severity: high
Author: Micah Babinski
Source: upstream

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
Persistence	`T1133` External Remote Services
Defense Evasion	`T1127` Trusted Developer Utilities Proxy Execution
Command & Control	`T1105` Ingress Tool Transfer

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

or:
TargetFilename|endswith: .ahk
TargetFilename|endswith: .aspx
TargetFilename|endswith: .au3
TargetFilename|endswith: .bat
TargetFilename|endswith: .cmd
TargetFilename|endswith: .dll
TargetFilename|endswith: .exe
TargetFilename|endswith: .hta
TargetFilename|endswith: .js
TargetFilename|endswith: .ps1
TargetFilename|endswith: .py
TargetFilename|endswith: .vbe
TargetFilename|endswith: .vbs
TargetFilename|endswith: .wsf
Image|endswith: '\ArcSOC.exe'

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.