Detection rules › Sigma

Cloudflared Portable Execution

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects the execution of the "cloudflared" binary from a non standard location.

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1090.001 Proxy: Internal Proxy

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation
Security-Auditing4688A new process has been created.

Stages and Predicates

Stage 1: selection

Image|endswith: '\cloudflared.exe'

Stage 2: not 1 of filter_main_admin_location

or:
Image|contains: ':\Program Files (x86)\cloudflared\'
Image|contains: ':\Program Files\cloudflared\'

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.

FieldKindValues
Imageends_with
  • \cloudflared.exe corpus 3 (sigma 3)
Imagematch
  • :\Program Files (x86)\cloudflared\
  • :\Program Files\cloudflared\