Obfuscated Files or Information: Command Obfuscation T1027.010

Events covered

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

Authoring guide

Patterns shared across the 39 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names 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 (31 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 (456 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. Click a value to expand the rules under this technique that use it.

Exclusions (56 distinct)

Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. 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. Click a value to expand the rules under this technique that exclude it.

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 10 rules

• Invocation Of Crypto-Classes From The "Cryptography" PowerShell Namespace
• Obfuscated PowerShell MSI Install via WindowsInstaller COM
• Potential Obfuscated Ordinal Call Via Rundll32
• Python One-Liners with Base64 Decoding
• Python One-Liners with Base64 Decoding - Linux
• Registry Set With Crypto-Classes From The "Cryptography" PowerShell Namespace
• Suspicious Explorer Process with Whitespace Padding - ClickFix/FileFix
• Suspicious Space Characters in RunMRU Registry Path - ClickFix
• Suspicious Space Characters in TypedPaths Registry Path - FileFix
• Suspicious Usage of For Loop with Recursive Directory Search in CMD

Elastic 24 rules

• Command Line Obfuscation via Whitespace Padding
• Command Obfuscation via Unicode Modifier Letters
• Decoded Payload Piped to Interpreter Detected via Defend for Containers
• Deprecated - Potential PowerShell Obfuscated Script
• Dynamic IEX Reconstruction via Method String Access
• Multi-Base64 Decoding Attempt from Suspicious Location
• Potential Antimalware Scan Interface Bypass via PowerShell
• Potential Dynamic IEX Reconstruction via Environment Variables
• Potential Hex Payload Execution via Command-Line
• Potential PowerShell Obfuscated Script via High Entropy
• Potential PowerShell Obfuscation via Backtick-Escaped Variable Expansion
• Potential PowerShell Obfuscation via Character Array Reconstruction
• Potential PowerShell Obfuscation via Concatenated Dynamic Command Invocation
• Potential PowerShell Obfuscation via High Numeric Character Proportion
• Potential PowerShell Obfuscation via High Special Character Proportion
• Potential PowerShell Obfuscation via Invalid Escape Sequences
• Potential PowerShell Obfuscation via Reverse Keywords
• Potential PowerShell Obfuscation via Special Character Overuse
• Potential PowerShell Obfuscation via String Concatenation
• Potential PowerShell Obfuscation via String Reordering
• PowerShell Obfuscation via Negative Index String Reversal
• Suspicious Execution with NodeJS
• Suspicious Powershell Script
• Suspicious Windows Powershell Arguments

Splunk 5 rules

• Command Line Homoglyphs - Windows (PowerShell)
• Command Line Homoglyphs - Windows (Sysmon)
• Command Line Homoglyphs - Windows (Windows Event Log)
• Windows Command Obfuscation with Environment Variable Substrings
• Windows PowerShell Process Implementing Manual Base64 Decoder