Detection rules › Sigma

Suspicious HWP Sub Processes

Severity
high
Author
Florian Roth (Nextron Systems)
Source
upstream

Detects suspicious Hangul Word Processor (Hanword) sub processes that could indicate an exploitation

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1566.001 Phishing: Spearphishing Attachment
ExecutionT1059.003 Command and Scripting Interpreter: Windows Command Shell, T1203 Exploitation for Client Execution

Event coverage

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

Stages and Predicates

Stage 1: selection

Image|endswith: '\gbb.exe'
ParentImage|endswith: '\Hwp.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.

FieldKindValues
Imageends_with
  • \gbb.exe
ParentImageends_with
  • \Hwp.exe