Detection rules › Sigma

Suspicious Scheduled Task Name As GUID

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects creation of a scheduled task with a GUID like name

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1053.005 Scheduled Task/Job: Scheduled Task
PersistenceT1053.005 Scheduled Task/Job: Scheduled Task
Privilege EscalationT1053.005 Scheduled Task/Job: Scheduled Task

Event coverage

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

Stages and Predicates

Stage 1: all of selection_img

CommandLine|contains: '/Create '
Image|endswith: '\schtasks.exe'

Stage 2: all of selection_tn

or:
CommandLine|contains: '/TN ''{'
CommandLine|contains: '/TN "{'
CommandLine|contains: '/TN {'

Stage 3: all of selection_end

or:
CommandLine|contains: '} '
CommandLine|contains: '}'''
CommandLine|contains: '}"'

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
CommandLinematch
  • /Create corpus 2 (sigma 2)
  • /TN "{
  • /TN '{
  • /TN {
  • }
  • }"
  • }'
Imageends_with
  • \schtasks.exe corpus 45 (sigma 45)