ATT&CK coverage › Technique
File and Directory Permissions Modification: Windows File and Directory Permissions Modification T1222.001
Adversaries may modify file or directory permissions/attributes to evade access control lists (ACLs) and access protected files. File and directory permissions are commonly managed by ACLs configured by the file or directory owner, or users with the appropriate permissions. File and directory ACL implementations vary by platform, but generally explicitly designate which users or groups can perform which actions (read, write, execute, etc.).
Events covered
4 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 16 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (21 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (84 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique.
Common exclusions (13 distinct)
Field/operator/value combinations that rules under this technique routinely exclude (top-level not() clauses). These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 3 rules
- AD Object WriteDAC Access
- Potentially Suspicious NTFS Symlink Behavior Modification
- Suspicious Recursive Takeown
Splunk 13 rules
- Windows AD Dangerous Deny ACL Modification
- Windows AD Dangerous Group ACL Modification
- Windows AD Dangerous User ACL Modification
- Windows AD DCShadow Privileges ACL Addition
- Windows AD Domain Root ACL Deletion
- Windows AD Domain Root ACL Modification
- Windows AD GPO New CSE Addition
- Windows AD Hidden OU Creation
- Windows AD Object Owner Updated
- Windows AD Suspicious Attribute Modification
- Windows File and Directory Enable ReadOnly Permissions
- Windows File and Directory Permissions Enable Inheritance
- Windows File and Directory Permissions Remove Inheritance