Threat Actor

NIMBUS MANTICORE

Also known as: NIMBUS MANTICORE, UNC1549, TA455, COBALT SMOKEY

[NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059) is a State Sponsored cyber espionage group associated with the Iranian Regime specifically the Iranian Revolutionary Guard Corps (IRGC). [NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059) has employed social engineering attacks to include HR related themes and has leveraged custom malware against its victims. [NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059) has sought sensitive information in victims’ environments to include network/IT documentation, intellectual property and emails. [NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059) has also leveraged compromised organizations as pivot points to access other organizations of interest. [NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059) has been active since 2021 and has targeted critical infrastructure organizations to include aviation, aerospace, telecommunications and defense and information technology related organizations within the United States, Australia, Midde East and Europe.(Citation: Mandiant_UNC1549TTPsTools_Nov2025)(Citation: CheckPoint_NimbusManticore_May2026)(Citation: CheckPoint_NimbusManticoreEurope_Sept2025)(Citation: Mandiant_UNC1549_Feb2024)

50
Techniques
13
Software

Properties

last_source
MITRE ATT&CK
stix_id
intrusion-set--318cf2c8-160b-4de7-be51-ecc3ded2705f
signal_observed_at
2026-10-14T17:10:08+00:00
retrieved_at
2026-10-14T17:10:10+00:00
type
intrusion-set

MITRE ATT&CK Techniques (50)

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Account Manipulation

Adversaries may manipulate accounts to maintain and/or elevate access to victim systems. Account manipulation may consist of any action that preserves

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AppDomainManager

Adversaries may execute their own malicious payloads by hijacking how the .NET `AppDomainManager` loads assemblies. The .NET framework uses the `AppDo

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Application Layer Protocol

Adversaries may communicate using OSI application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands

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Artificial Intelligence

Adversaries may obtain access to generative artificial intelligence (AI) tools, such as large language models (LLMs), to aid various techniques during

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Audio-Visual Content

Adversaries may create or manipulate audio, image, and video content to support targeting and malicious operations. Adversaries may also use synthetic

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Clear Network Connection History and Configurations

Adversaries may clear or remove evidence of malicious network connections in order to clean up traces of their operations. Configuration settings as w

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Cloud Accounts

Valid accounts in cloud environments may allow adversaries to perform actions to achieve Initial Access, Persistence, Privilege Escalation, or Defense

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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

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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

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DCSync

Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interfa

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DLL

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

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Data from Information Repositories

Adversaries may leverage information repositories to mine valuable information. Information repositories are tools that allow for storage of informati

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Data from Network Shared Drive

Adversaries may search network shares on computers they have compromised to find files of interest. Sensitive data can be collected from remote system

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Delay Execution

Adversaries may employ various time-based methods to evade detection and analysis. These techniques often exploit system clocks, delays, or timing mec

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Domain Account

Adversaries may attempt to get a listing of domain accounts. This information can help adversaries determine which domain accounts exist to aid in fol

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Domain Accounts

Adversaries may obtain and abuse credentials of a domain account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense E

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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

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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

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Gather Victim Org Information

Adversaries may gather information about the victim's organization that can be used during targeting. Information about an organization may include a

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Impersonation

Adversaries may impersonate a trusted person or organization in order to persuade and trick a target into performing some action on their behalf. For

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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

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Internal Spearphishing

After they already have access to accounts or systems within the environment, adversaries may use internal spearphishing to gain access to additional

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JavaScript

Adversaries may abuse various implementations of JavaScript for execution. JavaScript (JS) is a platform-independent scripting language (compiled just

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Kerberoasting

Adversaries may abuse a valid Kerberos ticket-granting ticket (TGT) or sniff network traffic to obtain a ticket-granting service (TGS) ticket that may

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Link Target

Adversaries may put in place resources that are referenced by a link that can be used during targeting. An adversary may rely upon a user clicking a m

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Local Account

Adversaries may create a local account to maintain access to victim systems. Local accounts are those configured by an organization for use by users,

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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

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Local Accounts

Adversaries may obtain and abuse credentials of a local account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Ev

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Local Email Collection

Adversaries may target user email on local systems to collect sensitive information. Files containing email data can be acquired from a user’s local s

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Malicious File

An adversary may rely upon a user opening a malicious file in order to gain execution. Users may be subjected to social engineering to get them to ope

Software & Tools (13)

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CRASHPAD [malware]

[CRASHPAD](https://attack.mitre.org/software/S9057) is a Windows executable written in C++ that gathers data from web browsers.(Citation: Mandiant_UNC

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DCSYNCER.SLICK [malware]

[DCSYNCER.SLICK](https://attack.mitre.org/software/S9065) is a Windows executable that is designed to gather credentials from victim devices.(Citation

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DEEPROOT [malware]

[DEEPROOT](https://attack.mitre.org/software/S9063) is a Linux backdoor written in Golang.(Citation: Mandiant_UNC1549_Nov2025) [DEEPROOT](https://atta

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LIGHTRAIL [malware]

[LIGHTRAIL](https://attack.mitre.org/software/S9061) is a tunneler malware.(Citation: Mandiant_UNC1549_Feb2024) [LIGHTRAIL](https://attack.mitre.org/s

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MiniBike [malware]

[MiniBike](https://attack.mitre.org/software/S9059) is a custom backdoor written in C++ designed for command execution, data discovery, gathering, and

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MiniBrowse [malware]

[MiniBrowse](https://attack.mitre.org/software/S9062) is a custom stealer designed for the theft of credentials in browsers and passwords stores. [Min

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MiniBus [malware]

[MiniBus](https://attack.mitre.org/software/S9060) is a custom backdoor used for command execution, data discovery, gathering, and exfiltration. [Mini

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MiniFast [malware]

[MiniFast](https://attack.mitre.org/software/S9052) is a custom malware designed for long-term persistence and remote code execution. [MiniFast](https

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MiniJunk [malware]

[MiniJunk](https://attack.mitre.org/software/S9053) is a custom malware designed for long-term persistence and remote code execution.(Citation: CheckP

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POLLBLEND [malware]

[POLLBLEND](https://attack.mitre.org/software/S9066) is a Windows tunneler written C++ that has utilized hardcoded C2 servers and leveraged hardcoded

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SIGHTGRAB [malware]

[SIGHTGRAB](https://attack.mitre.org/software/S9058) is a Windows executable written in C that captures and stages stolen data on victim devices.(Cita

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TRUSTTRAP [malware]

[TRUSTTRAP](https://attack.mitre.org/software/S9064) is a malware that uses a fictitious prompt to trick users to submit their credentials.(Citation:

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TWOSTROKE [malware]

[TWOSTROKE](https://attack.mitre.org/software/S9067) is malicious backdoor written in C++ that is capable of discovery actions, executing payloads and

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