Indicator Removal on Host

Indicator Removal on Host
Technique
ID	T0872
Tactic	Evasion
Data Sources	File monitoring, Process monitoring, Process command-line parameters, API monitoring, Windows event logs
Asset	Human-Machine Interface, Safety Instrumented System/Protection Relay

Description

Adversaries may attempt to remove indicators of their presence on a system in an effort to cover their tracks. In cases where an adversary may feel detection is imminent, they may try to overwrite, delete, or cover up changes they have made to the device.

Procedure Examples

Dragonfly 2.0 deleted indicators on staging and target devices by uninstalling software, removing event logs, batch scripts, screenshots, registry keys, documents, and tools they brought into the target networks.1
KillDisk deletes application, security, setup, and system event logs from Windows systems.2
Triton would reset the controller to the previous state over TriStation and if this failed it would write a dummy program to memory in what was likely an attempt at anti-forensics.3

Mitigations

Restrict File and Directory Permissions - Protect files stored locally with proper permissions to limit opportunities for adversaries to remove indicators of their activity on the system.45

References

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Initial Access	Data Historian Compromise Drive-by Compromise Engineering Workstation Compromise Exploit Public-Facing Application Exploitation of Remote Services External Remote Services Initial Access Internet Accessible Device Remote Services Replication Through Removable Media Rogue Master Spearphishing Attachment Supply Chain Compromise Wireless Compromise

Execution	Change Operating Mode Command-Line Interface Execution Execution through API Graphical User Interface Hooking Modify Controller Tasking Native API Scripting User Execution

Persistence	Modify Program Module Firmware Persistence Project File Infection System Firmware Valid Accounts

Evasion	Change Operating Mode Evasion Exploitation for Evasion Indicator Removal on Host Masquerading Rootkit Spoof Reporting Message

Discovery	Discovery Network Connection Enumeration Network Sniffing Remote System Discovery Remote System Information Discovery Wireless Sniffing

Lateral Movement	Default Credentials Exploitation of Remote Services Lateral Movement Lateral Tool Transfer Program Download Remote Services Valid Accounts

Collection	Automated Collection Collection Data from Information Repositories Detect Operating Mode I/O Image Man in the Middle Monitor Process State Point & Tag Identification Program Upload Screen Capture Wireless Sniffing

Inhibit Response Function	Activate Firmware Update Mode Alarm Suppression Block Command Message Block Reporting Message Block Serial COM Data Destruction Denial of Service Device Restart/Shutdown Inhibit Response Function Manipulate I/O Image Modify Alarm Settings Rootkit Service Stop System Firmware

Impair Process Control	Brute Force I/O Impair Process Control Modify Parameter Module Firmware Spoof Reporting Message Unauthorized Command Message

Impact	Damage to Property Denial of Control Denial of View Impact Loss of Availability Loss of Control Loss of Productivity and Revenue Loss of Protection Loss of Safety Loss of View Manipulation of Control Manipulation of View Theft of Operational Information

Indicator Removal on Host

Description

Procedure Examples

Mitigations

References

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