# Chaotic Eclipse

> As of 2026-09-22, Chaotic Eclipse is a threat actor tracked by Threadlinqs Intelligence across 7 threats spanning vulnerability, zero day. Also known as Nightmare Eclipse, Nightmare-Eclipse. ATT&CK coverage spans 78 techniques across 13 tactics in 7 of 7 tracked threats. Most-observed techniques: T1068 (Exploitation for Privilege Escalation), T1082 (System Information Discovery), T1685 (Disable or Modify Tools).

- **Tracked threats:** 7
- **Categories:** VULNERABILITY, ZERO_DAY
- **Also known as:** Nightmare Eclipse, Nightmare-Eclipse
- **As of:** 2026-09-22

## ATT&CK techniques observed

78 techniques observed across 7 of 7 tracked threats. Tactics: Stealth (formerly Defense Evasion) (13), Execution (10), Discovery (8), Initial Access (6), Persistence (6), Privilege Escalation (6).

- [T1068](https://intel.threadlinqs.com/technique/T1068) Exploitation for Privilege Escalation — Privilege Escalation — observed in 6 of 7 tracked threats
- [T1082](https://intel.threadlinqs.com/technique/T1082) System Information Discovery — Discovery — observed in 5 of 7 tracked threats
- [T1685](https://intel.threadlinqs.com/technique/T1685) Disable or Modify Tools — Defense Impairment — observed in 5 of 7 tracked threats
- [T1070.004](https://intel.threadlinqs.com/technique/T1070.004) File Deletion — Stealth (formerly Defense Evasion) — observed in 4 of 7 tracked threats
- [T1106](https://intel.threadlinqs.com/technique/T1106) Native API — Execution — observed in 4 of 7 tracked threats
- [T1548](https://intel.threadlinqs.com/technique/T1548) Abuse Elevation Control Mechanism — Privilege Escalation — observed in 4 of 7 tracked threats
- [T1574](https://intel.threadlinqs.com/technique/T1574) Hijack Execution Flow — Stealth (formerly Defense Evasion) — observed in 4 of 7 tracked threats
- [T1003](https://intel.threadlinqs.com/technique/T1003) OS Credential Dumping — Credential Access — observed in 3 of 7 tracked threats
- [T1005](https://intel.threadlinqs.com/technique/T1005) Data from Local System — Collection — observed in 3 of 7 tracked threats
- [T1033](https://intel.threadlinqs.com/technique/T1033) System Owner/User Discovery — Discovery — observed in 3 of 7 tracked threats
- [T1036.005](https://intel.threadlinqs.com/technique/T1036.005) Match Legitimate Resource Name or Location — Stealth (formerly Defense Evasion) — observed in 3 of 7 tracked threats
- [T1083](https://intel.threadlinqs.com/technique/T1083) File and Directory Discovery — Discovery — observed in 3 of 7 tracked threats
- [T1134](https://intel.threadlinqs.com/technique/T1134) Access Token Manipulation — Privilege Escalation — observed in 3 of 7 tracked threats
- [T1552](https://intel.threadlinqs.com/technique/T1552) Unsecured Credentials — Credential Access — observed in 3 of 7 tracked threats
- [T1059](https://intel.threadlinqs.com/technique/T1059) Command and Scripting Interpreter — Execution — observed in 2 of 7 tracked threats

## Tracked threats

- [BigDiskBuster PoC Blocks Windows Defender Signature/Platform Updates (DoS)](https://intel.threadlinqs.com/threat/TL-2026-2613) — MEDIUM
- [LegacyHive: Local Privilege Escalation PoC via Windows User Profile Service (ProfSvc) Registry Hive Mounting](https://intel.threadlinqs.com/threat/TL-2026-1499) — MEDIUM
- [RoguePlanet: Microsoft Defender Elevation of Privilege Vulnerability (CVE-2026-50656) Patched](https://intel.threadlinqs.com/threat/TL-2026-1157) — HIGH
- [CVE-2026-50656: RoguePlanet Microsoft Defender Zero-Day Local Privilege Escalation (Malware Protection Engine TOCTOU)](https://intel.threadlinqs.com/threat/TL-2026-0835) — HIGH
- [Windows Defender 0-Day Local Privilege Escalation "RoguePlanet" (Nightmare Eclipse Defender Exploit Series)](https://intel.threadlinqs.com/threat/TL-2026-0743) — HIGH
- [Windows 'MiniPlasma' Zero-Day — Unpatched SYSTEM LPE via cldflt.sys HsmOsBlockPlaceholderAccess / CfAbortHydration (CVE-2020-17103 Regression)](https://intel.threadlinqs.com/threat/TL-2026-0523) — HIGH
- [YellowKey & GreenPlasma — Unpatched Windows BitLocker Bypass & CTFMON LPE Zero-Days With Public PoC (Chaotic/Nightmare Eclipse)](https://intel.threadlinqs.com/threat/TL-2026-0512) — CRITICAL

## Related CVEs

3 CVEs referenced by tracked Chaotic Eclipse activity.

- [CVE-2026-50656](https://intel.threadlinqs.com/cve/CVE-2026-50656)
- [CVE-2026-33825](https://intel.threadlinqs.com/cve/CVE-2026-33825)
- [CVE-2020-17103](https://intel.threadlinqs.com/cve/CVE-2020-17103)

## Full data

Infrastructure, IOC values and detection queries (Splunk SPL / Microsoft KQL / Sigma) require the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp

Canonical: https://intel.threadlinqs.com/actor/Chaotic%20Eclipse