Threat Actor

Threat Group-3390

Also known as: Threat Group-3390, Earth Smilodon, TG-3390, Emissary Panda, BRONZE UNION, APT27, Iron Tiger, LuckyMouse, Linen Typhoon

[Threat Group-3390](https://attack.mitre.org/groups/G0027) is a Chinese threat group that has extensively used strategic Web compromises to target victims.(Citation: Dell TG-3390) The group has been active since at least 2010 and has targeted organizations in the aerospace, government, defense, technology, energy, manufacturing and gambling/betting sectors.(Citation: SecureWorks BRONZE UNION June 2017)(Citation: Securelist LuckyMouse June 2018)(Citation: Trend Micro DRBControl February 2020)

50
Techniques
25
Software

Properties

stix_id
intrusion-set--fb366179-766c-4a4a-afa1-52bff1fd601c
signal_observed_at
2026-09-11T17:55:00+00:00
type
intrusion-set

MITRE ATT&CK Techniques (50)

Archive via Library

An adversary may compress or encrypt data that is collected prior to exfiltration using 3rd party libraries. Many libraries exist that can archive dat

At

Adversaries may abuse the [at](https://attack.mitre.org/software/S0110) utility to perform task scheduling for initial or recurring execution of malic

Automated Collection

Once established within a system or network, an adversary may use automated techniques for collecting internal data. Methods for performing this techn

Bypass User Account Control

Adversaries may bypass UAC mechanisms to elevate process privileges on system. Windows User Account Control (UAC) allows a program to elevate its priv

Code Signing Certificates

Adversaries may buy and/or steal code signing certificates that can be used during targeting. Code signing is the process of digitally signing executa

Compression

Adversaries may use compression to obfuscate their payloads or files. Compressed file formats such as ZIP, gzip, 7z, and RAR can compress and archive

Compromise Software Supply Chain

Adversaries may manipulate application software prior to receipt by a final consumer for the purpose of data or system compromise. Supply chain compro

DLL

Adversaries may abuse dynamic-link library files (DLLs) in order to achieve persistence, escalate privileges, and evade defenses. DLLs are libraries t

Data Transfer Size Limits

An adversary may exfiltrate data in fixed size chunks instead of whole files or limit packet sizes below certain thresholds. This approach may be used

Data from Local System

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to

Deobfuscate/Decode Files or Information

Adversaries may use [Obfuscated Files or Information](https://attack.mitre.org/techniques/T1027) to hide artifacts of an intrusion from analysis. They

Disable Windows Event Logging

Adversaries may disable Windows event logging to limit data that can be leveraged for detections and audits. Windows event logs record user and system

Disable or Modify Windows Event Log

Adversaries may disable or modify the Windows Event Log to limit data that can be leveraged for detections and audits. Windows Event Log records user

Domains

Adversaries may acquire domains that can be used during targeting. Domain names are the human readable names used to represent one or more IP addresse

Drive-by Compromise

Adversaries may gain access to a system through a user visiting a website over the normal course of browsing. Multiple ways of delivering exploit code

Drive-by Target

Adversaries may prepare an operational environment to infect systems that visit a website over the normal course of browsing. Endpoint systems may be

Encrypted/Encoded File

Adversaries may encrypt or encode files to obfuscate strings, bytes, and other specific patterns to impede detection. Encrypting and/or encoding file

Exfiltration to Cloud Storage

Adversaries may exfiltrate data to a cloud storage service rather than over their primary command and control channel. Cloud storage services allow fo

Exploit Public-Facing Application

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network. The weakness in the system can be a

Exploitation for Client Execution

Adversaries may exploit software vulnerabilities in client applications to execute code. Vulnerabilities can exist in software due to unsecure coding

Exploitation for Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges. Exploitation of a software vulnerability occurs when an adversar

Exploitation of Remote Services

Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network. Exploitation of a software vulnerabi

External Remote Services

Adversaries may leverage external-facing remote services to initially access and/or persist within a network. Remote services such as VPNs, Citrix, an

File Deletion

Adversaries may delete files left behind by the actions of their intrusion activity. Malware, tools, or other non-native files dropped or created on a

Ingress Tool Transfer

Adversaries may transfer tools or other files from an external system into a compromised environment. Tools or files may be copied from an external ad

Keylogging

Adversaries may log user keystrokes to intercept credentials as the user types them. Keylogging is likely to be used to acquire credentials for new ac

LSA Secrets

Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different creden

LSASS Memory

Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS). After a

Local Account

Adversaries may attempt to get a listing of local system accounts. This information can help adversaries determine which local accounts exist on a sys

Local Data Staging

Adversaries may stage collected data in a central location or directory on the local system prior to Exfiltration. Data may be kept in separate files

Software & Tools (25)

ASPXSpy [malware]

[ASPXSpy](https://attack.mitre.org/software/S0073) is a Web shell. It has been modified by [Threat Group-3390](https://attack.mitre.org/groups/G0027)

China Chopper [malware]

[China Chopper](https://attack.mitre.org/software/S0020) is a [Web Shell](https://attack.mitre.org/techniques/T1505/003) hosted on Web servers to prov

Clambling [malware]

[Clambling](https://attack.mitre.org/software/S0660) is a modular backdoor written in C++ that has been used by [Threat Group-3390](https://attack.mit

Cobalt Strike [tool]

[Cobalt Strike](https://attack.mitre.org/software/S0154) is a commercial, full-featured, remote access tool that bills itself as “adversary simulation

HTTPBrowser [malware]

[HTTPBrowser](https://attack.mitre.org/software/S0070) is malware that has been used by several threat groups. (Citation: ThreatStream Evasion Analysi

HyperBro [malware]

[HyperBro](https://attack.mitre.org/software/S0398) is a custom in-memory backdoor used by [Threat Group-3390](https://attack.mitre.org/groups/G0027).

Impacket [tool]

[Impacket](https://attack.mitre.org/software/S0357) is an open source collection of modules written in Python for programmatically constructing and ma

MimiKatz [malware]

[Mimikatz](https://attack.mitre.org/software/S0002) is a credential dumper capable of obtaining plaintext Windows account logins and passwords, along

Mimikatz [tool]

[Mimikatz](https://attack.mitre.org/software/S0002) is a credential dumper capable of obtaining plaintext Windows account logins and passwords, along

NBTscan [tool]

[NBTscan](https://attack.mitre.org/software/S0590) is an open source tool that has been used by state groups to conduct internal reconnaissance within

Net [tool]

The [Net](https://attack.mitre.org/software/S0039) utility is a component of the Windows operating system. It is used in command-line operations for c

Pandora [malware]

[Pandora](https://attack.mitre.org/software/S0664) is a multistage kernel rootkit with backdoor functionality that has been in use by [Threat Group-33

PlugX [malware]

[PlugX](https://attack.mitre.org/software/S0013) is a remote access tool (RAT) with modular plugins that has been used by multiple threat groups.(Cita

RCSession [malware]

[RCSession](https://attack.mitre.org/software/S0662) is a backdoor written in C++ that has been in use since at least 2018 by [Mustang Panda](https://

SysUpdate [malware]

[SysUpdate](https://attack.mitre.org/software/S0663) is a backdoor written in C++ that has been used by [Threat Group-3390](https://attack.mitre.org/g

Systeminfo [tool]

[Systeminfo](https://attack.mitre.org/software/S0096) is a Windows utility that can be used to gather detailed information about a computer. (Citation

Tasklist [tool]

The [Tasklist](https://attack.mitre.org/software/S0057) utility displays a list of applications and services with their Process IDs (PID) for all task

Windows Credential Editor [tool]

[Windows Credential Editor](https://attack.mitre.org/software/S0005) is a password dumping tool. (Citation: Amplia WCE)

ZxShell [malware]

[ZxShell](https://attack.mitre.org/software/S0412) is a remote administration tool and backdoor that can be downloaded from the Internet, particularly

certutil [tool]

[certutil](https://attack.mitre.org/software/S0160) is a command-line utility that can be used to obtain certificate authority information and configu

gh0st RAT [malware]

[gh0st RAT](https://attack.mitre.org/software/S0032) is a remote access tool (RAT). The source code is public and it has been used by multiple groups.

gsecdump [tool]

[gsecdump](https://attack.mitre.org/software/S0008) is a publicly-available credential dumper used to obtain password hashes and LSA secrets from Wind

ipconfig [tool]

[ipconfig](https://attack.mitre.org/software/S0100) is a Windows utility that can be used to find information about a system's TCP/IP, DNS, DHCP, and

netstat [tool]

[netstat](https://attack.mitre.org/software/S0104) is an operating system utility that displays active TCP connections, listening ports, and network s

pwdump [tool]

[pwdump](https://attack.mitre.org/software/S0006) is a credential dumper. (Citation: Wikipedia pwdump)

Explore this actor's full graph with Ninja Signal