Command and Scripting Interpreter

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell.

There are also cross-platform interpreters such as Python, as well as those commonly associated with client applications such as JavaScript and Visual Basic.

Adversaries may abuse these technologies in various ways as a means of executing arbitrary commands. Commands and scripts can be embedded in Initial Access payloads delivered to victims as lure documents or as secondary payloads downloaded from an existing C2. Adversaries may also execute commands through interactive terminals/shells, as well as utilize various Remote Services in order to achieve remote Execution.[1][2][3]

ID: T1059
Tactic: Execution
Platforms: Azure AD, Google Workspace, IaaS, Linux, Network, Office 365, Windows, macOS
Supports Remote:  Yes
Version: 2.4
Created: 31 May 2017
Last Modified: 27 March 2023

Procedure Examples

ID Name Description
G0073 APT19

APT19 downloaded and launched code within a SCT file.[4]

G0050 APT32

APT32 has used COM scriptlets to download Cobalt Strike beacons.[5]

G0067 APT37

APT37 has used Ruby scripts to execute payloads.[6]

G0087 APT39

APT39 has utilized custom scripts to perform internal reconnaissance.[7][8]

S0234 Bandook

Bandook can support commands to execute Java-based payloads.[9]

S0486 Bonadan

Bonadan can create bind and reverse shells on the infected system.[10]

S0023 CHOPSTICK

CHOPSTICK is capable of performing remote command execution.[11][12]

C0029 Cutting Edge

During Cutting Edge, threat actors used Perl scripts to enable the deployment of the THINSPOOL shell script dropper and for enumerating host data.[13][14]

S0334 DarkComet

DarkComet can execute various types of scripts on the victim’s machine.[15]

S0695 Donut

Donut can generate shellcode outputs that execute via Ruby.[16]

G0035 Dragonfly

Dragonfly has used the command line for execution.[17]

S0363 Empire

Empire uses a command-line interface to interact with systems.[18]

G0053 FIN5

FIN5 scans processes on all victim systems in the environment and uses automated scripts to pull back the results.[19]

G0037 FIN6

FIN6 has used scripting to iterate through a list of compromised PoS systems, copy data to a log file, and remove the original data files.[20][21]

G0046 FIN7

FIN7 used SQL scripts to help perform tasks on the victim's machine.[22][23][22]

S0618 FIVEHANDS

FIVEHANDS can receive a command line argument to limit file encryption to specified directories.[24][25]

G0117 Fox Kitten

Fox Kitten has used a Perl reverse shell to communicate with C2.[26]

S0460 Get2

Get2 has the ability to run executables with command-line arguments.[27]

S0032 gh0st RAT

gh0st RAT is able to open a remote shell to execute commands.[28][29]

S0434 Imminent Monitor

Imminent Monitor has a CommandPromptPacket and ScriptPacket module(s) for creating a remote shell and executing scripts.[30]

G0004 Ke3chang

Malware used by Ke3chang can run commands on the command-line interface.[31][32]

S0487 Kessel

Kessel can create a reverse shell between the infected host and a specified system.[10]

S0167 Matryoshka

Matryoshka is capable of providing Meterpreter shell access.[33]

G0049 OilRig

OilRig has used various types of scripting for execution.[34][35][36][37][38]

C0005 Operation Spalax

For Operation Spalax, the threat actors used Nullsoft Scriptable Install System (NSIS) scripts to install malware.[39]

S0598 P.A.S. Webshell

P.A.S. Webshell has the ability to create reverse shells with Perl scripts.[40]

S0428 PoetRAT

PoetRAT has executed a Lua script through a Lua interpreter for Windows.[41]

S1110 SLIGHTPULSE

SLIGHTPULSE contains functionality to execute arbitrary commands passed to it.[42]

S0374 SpeakUp

SpeakUp uses Perl scripts.[43]

G0038 Stealth Falcon

Stealth Falcon malware uses WMI to script data collection and command execution on the victim.[44]

G0107 Whitefly

Whitefly has used a simple remote shell tool that will call back to the C2 server and wait for commands.[45]

G0124 Windigo

Windigo has used a Perl script for information gathering.[10]

S0219 WINERACK

WINERACK can create a reverse shell that utilizes statically-linked Wine cmd.exe code to emulate Windows command prompt commands.[46]

S0330 Zeus Panda

Zeus Panda can launch remote scripts on the victim’s machine.[47]

Mitigations

ID Mitigation Description
M1049 Antivirus/Antimalware

Anti-virus can be used to automatically quarantine suspicious files.

M1040 Behavior Prevention on Endpoint

On Windows 10, enable Attack Surface Reduction (ASR) rules to prevent Visual Basic and JavaScript scripts from executing potentially malicious downloaded content [48].

M1045 Code Signing

Where possible, only permit execution of signed scripts.

M1042 Disable or Remove Feature or Program

Disable or remove any unnecessary or unused shells or interpreters.

M1038 Execution Prevention

Use application control where appropriate. For example, PowerShell Constrained Language mode can be used to restrict access to sensitive or otherwise dangerous language elements such as those used to execute arbitrary Windows APIs or files (e.g., Add-Type).[49]

M1026 Privileged Account Management

When PowerShell is necessary, consider restricting PowerShell execution policy to administrators. Be aware that there are methods of bypassing the PowerShell execution policy, depending on environment configuration.[50]

PowerShell JEA (Just Enough Administration) may also be used to sandbox administration and limit what commands admins/users can execute through remote PowerShell sessions.[51]

M1021 Restrict Web-Based Content

Script blocking extensions can help prevent the execution of scripts and HTA files that may commonly be used during the exploitation process. For malicious code served up through ads, adblockers can help prevent that code from executing in the first place.

Detection

ID Data Source Data Component Detects
DS0017 Command Command Execution

Monitor command-line arguments for script execution and subsequent behavior. Actions may be related to network and system information Discovery, Collection, or other scriptable post-compromise behaviors and could be used as indicators of detection leading back to the source script. Scripts are likely to perform actions with various effects on a system that may generate events, depending on the types of monitoring used.

DS0011 Module Module Load

Monitor for events associated with scripting execution, such as the loading of modules associated with scripting languages (ex: JScript.dll or vbscript.dll).

DS0009 Process Process Creation

Monitor log files for process execution through command-line and scripting activities. This information can be useful in gaining additional insight to adversaries' actions through how they use native processes or custom tools. Also monitor for loading of modules associated with specific languages.

Process Metadata

Monitor contextual data about a running process, which may include information such as environment variables, image name, user/owner, or other information that may reveal abuse of system features. For example, consider monitoring for Windows Event ID (EID) 400, which shows the version of PowerShell executing in the EngineVersion field (which may also be relevant to detecting a potential Downgrade Attack) as well as if PowerShell is running locally or remotely in the HostName field. Furthermore, EID 400 may indicate the start time and EID 403 indicates the end time of a PowerShell session.[52]

DS0012 Script Script Execution

Monitor for any attempts to enable scripts running on a system would be considered suspicious. If scripts are not commonly used on a system, but enabled, scripts running out of cycle from patching or other administrator functions are suspicious. Scripts should be captured from the file system when possible to determine their actions and intent.

References

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