ATT&CK coverage › Technique
Data Encrypted for Impact T1486
Adversaries may encrypt data on target systems or on large numbers of systems in a network to interrupt availability to system and network resources. They can attempt to render stored data inaccessible by encrypting files or data on local and remote drives and withholding access to a decryption key. This may be done in order to extract monetary compensation from a victim in exchange for decryption or a decryption key (ransomware) or to render data permanently inaccessible in cases where the key is not saved or transmitted.
Events covered
8 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 15 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 (12 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 (64 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.
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 6 rules
- Load Of RstrtMgr.DLL By A Suspicious Process
- Load Of RstrtMgr.DLL By An Uncommon Process
- Portable Gpg.EXE Execution
- Renamed Gpg.EXE Execution
- Suspicious Creation TXT File in User Desktop
- Suspicious Reg Add BitLocker
Splunk 4 rules
- High Process Termination Frequency
- Ransomware Notes bulk creation
- Ryuk Test Files Detected
- Samsam Test File Write