Detection rules › Kusto Query Language
Base64 encoded Windows process command-lines (Normalized Process Events)
'Identifies instances of a base64 encoded PE file header seen in the process command line parameter. To use this analytics rule, make sure you have deployed the ASIM normalization parsers'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059 Command and Scripting Interpreter |
| Defense Evasion | T1027 Obfuscated Files or Information, T1140 Deobfuscate/Decode Files or Information |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Sysmon | 5 | Process terminated |
| Security-Auditing | 4688 | A new process has been created. |
| Security-Auditing | 4689 | A process has exited. |
Stages and Predicates
Stage 1: source
imProcessCreate
Stage 2: where
CommandLine contains "TVqQAAMAAAAEAAA"
Stage 3: where
Process is_not_null
Stage 4: summarize
Stage 5: extend
Stage 6: extend
Stage 7: extend
Stage 8: project-away
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.
| Field | Kind | Values |
|---|---|---|
CommandLine | contains |
|