Nukesped

Overview

Backdoor:Win32/Nukesped is a highly sophisticated, persistent backdoor remote access trojan (RAT) heavily attributed to the **Lazarus Group (HIDDEN COBRA)**, a North Korean state-sponsored advanced persistent threat (APT). Nukesped (and its variants) has been deployed in high-profile cyberespionage and financially motivated attacks worldwide, targeting cryptocurrency exchanges, financial institutions, the aerospace industry, and critical infrastructure.

Understanding Nukesped (Lazarus Group APT)
To an end-user, Nukesped is entirely invisible. For a security operations center (SOC), the detection of Nukesped is a critical 'Code Red' event, indicating that the network has been breached by a highly capable nation-state adversary. Nukesped is not a noisy, destructive wiper; it is designed for long-term intelligence gathering, lateral movement, and the facilitation of multi-million dollar cryptocurrency heists.

Execution, Evasion, and C2 Mechanics
Lazarus operators typically deploy Nukesped following a successful spear-phishing campaign (`T1566.001`), watering hole attack, or the exploitation of perimeter vulnerabilities (like vulnerable VPNs or unpatched web servers). The malware often utilizes advanced evasion techniques, including DLL side-loading (`T1574.002`), where a legitimate, signed executable (e.g., a known antivirus component or legitimate software updater) is hijacked to load the malicious Nukesped DLL into memory, bypassing many static and behavioral defenses. It establishes persistence via hidden scheduled tasks or modifying system services (`T1543.003`). The backdoor communicates with an elaborate, heavily obfuscated Command and Control (C2) infrastructure (`T1071.001`), allowing attackers to execute arbitrary shell commands (`T1059.003`), manipulate files, steal credentials, and pivot deeper into the network.

Indicators of Compromise & Impact
The impact is a total, state-sponsored compromise of the network, risking massive financial loss and intellectual property theft. IoCs require advanced EDR: look for DLL side-loading events involving specific known-vulnerable signed binaries, unexpected network connections originating from those hijacked binaries, and anomalous scheduled tasks executing from temporary directories.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
• T1566.001: Scan email attachments for malicious macros, scripts, or suspicious archive files.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_NUKESPED_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Nukesped"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "nukesped" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Nukesped (Trojan) Execution & Triage
id: 5d95ef08-2a54-5690-9f07-fdab7b73ce48
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Nukesped malware family. Detects suspicious execution from temporary user
  directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/nukesped
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1071_001
- attack.t1059_003
- attack.t1566_001
- attack.t1574_002
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_NUKESPED_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Nukesped tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "nukesped" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Do not immediately terminate the connection if possible; engage Incident Response (IR) specialists to monitor the attacker's lateral movement and identify all compromised assets before pulling the plug.
2. Once IR is engaged, physically isolate the affected network segments to trap the attacker.
3. Capture extensive live memory images (RAM dumps) of compromised endpoints to extract the decrypted Nukesped payload and its C2 configuration.
4. Assume the entire Active Directory domain is compromised (Golden Ticket scenario); prepare for a full domain rebuild and enterprise-wide password reset.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do NOT attempt to remediate a Nukesped infection using standard IT procedures (e.g., running AV and rebooting); APT actors will immediately notice the remediation and deploy destructive wipers or establish deeper backdoors.
2. Avoid relying solely on IoCs (IPs/Hashes); Lazarus frequently rotates infrastructure. Focus on behavioral detection of DLL side-loading.

References & External Analysis

• Search "nukesped" on VirusTotal (External Analysis)
• Search "nukesped" on Any.Run (Sandbox Sandbox)
• Search "nukesped" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Midie
• Z_Dem0N
• Karamanak
• Moonpie
• Addlyrics
• Guagua
• Multiinjector
• Disfa

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/nukesped.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.