T1140 Deobfuscate/Decode Files or Information Mappings

Adversaries may use Obfuscated Files or Information to hide artifacts of an intrusion from analysis. They may require separate mechanisms to decode or deobfuscate that information depending on how they intend to use it. Methods for doing that include built-in functionality of malware or by using utilities present on the system.

One such example is use of certutil to decode a remote access tool portable executable file that has been hidden inside a certificate file. (Citation: Malwarebytes Targeted Attack against Saudi Arabia) Another example is using the Windows <code>copy /b</code> command to reassemble binary fragments into a malicious payload. (Citation: Carbon Black Obfuscation Sept 2016)

Sometimes a user's action may be required to open it for deobfuscation or decryption as part of User Execution. The user may also be required to input a password to open a password protected compressed/encrypted file that was provided by the adversary. (Citation: Volexity PowerDuke November 2016)

View in MITRE ATT&CK®

Mappings

Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name
alerts_for_windows_machines Alerts for Windows Machines technique_scores T1140 Deobfuscate/Decode Files or Information
azure_sentinel Azure Sentinel technique_scores T1140 Deobfuscate/Decode Files or Information
azure_defender_for_app_service Azure Defender for App Service technique_scores T1140 Deobfuscate/Decode Files or Information