ATT&CK coverage › Technique

Obfuscated Files or Information: Binary Padding T1027.001

Adversaries may use binary padding to add junk data and change the on-disk representation of malware. This can be done without affecting the functionality or behavior of a binary, but can increase the size of the binary beyond what some security tools are capable of handling due to file size limitations.

Events covered

2 catalog events are tagged with this technique by at least one rule.

ProviderEvent IDTitle
Security-Auditing5038Code integrity determined that the image hash of a file is not valid.
Security-Auditing6281Code Integrity determined that the page hashes of an image file are not valid.

Authoring guide

Patterns shared across the 1 rule 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 (1 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.

FieldRulesHowSample values
param11match 1\Program Files\Sophos\, \System32\drivers\CrowdStrike\, \Windows\System32\ScriptControl64_

Top indicator values (5 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.

FieldKindValueRules (here)Corpus reach
param1match\Program Files\CrowdStrike\1
param1match\Program Files\Sophos\1
param1match\CSFalconServiceUninstallTool_1
param1match\Windows\System32\ScriptControl64_1
param1match\System32\drivers\CrowdStrike\1

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 1 rule