MalwareUsed by 1 actor

FalconFlank

For your environment

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THREAT ACTORS

Groups observed using it

1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

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Nightmare-Eclipse

FalconFlank is a local privilege escalation from standard user to NT AUTHORITY\SYSTEM targeting CrowdStrike Falcon Sensor's Microsoft Office file malicious macro removal response action.

via cyderes blogcyderes.com

MITRE ATT&CK

Techniques & procedures

10 distinct techniques documented for this family, organized by ATT&CK tactic.

Resource Development

1 technique

T1587.004ExploitsEvidence1

Le chercheur anonyme opérant sous le pseudonyme Nightmare Eclipse a publié un exploit d’élévation de privilèges... Le PoC est disponible publiquement sur GitHub.

Execution

5 techniques

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

T1059.003Windows Command ShellEvidence1

L’exploitation réussie permet d’ouvrir une invite de commande avec des privilèges SYSTEM.

T1204.002Malicious FileEvidence2

“FalconFlank ... abuses the Office malicious macro remediation workflow in CrowdStrike Falcon Sensor.”

T1574.001DLLEvidence1

After redirecting the path to the real PowerShell directory, FalconFlank places bcrypt.dll in PowerShell's application directory, where "the standard Windows DLL search order checks the application directory first."

T1574.006Dynamic Linker HijackingEvidence1

“Restrict the creation of NTFS symbolic links by non-privileged users where possible.”

Persistence

1 technique

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

Privilege Escalation

3 techniques

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

T1068Exploitation for Privilege EscalationEvidence10

HardBreacher "triggers a privilege escalation flaw" in Kaspersky Endpoint Security; PrettyPrague reportedly gains a "SYSTEM-level shell" through Avast Sandbox; FalconFlank allegedly escalates a low-privileged local user through a high-privilege Falcon remediation feature.

T1134Access Token ManipulationEvidence1

The FalconFlank payload duplicates the current SYSTEM token, assigns it to the attacker's desktop session, and spawns conhost.exe as SYSTEM. PrettyPrague likewise duplicates a SYSTEM token and changes TokenSessionId to launch in the interactive desktop session.

Stealth

4 techniques

T1027Obfuscated Files or InformationEvidence1

"or obfuscate the PoC"

T1134Access Token ManipulationEvidence1

T1574.001DLLEvidence1

T1574.006Dynamic Linker HijackingEvidence1

“Restrict the creation of NTFS symbolic links by non-privileged users where possible.”

Other

1 technique

T1562.001Disable or Modify ToolsEvidence1

"if you want to test you either have to add it to the exclusions"

ACTIVITY FEED

Recent activity

1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

1 SOURCESView more in app

cyderes blogNews

Sep 8, 2026

Nightmare-Eclipse Zero-Days Hit CrowdStrike, NVIDIA, Avast & More

A publicly released local privilege-escalation proof of concept targeting CrowdStrike Falcon Sensor. It abuses macro-remediation handling, a junction/path redirection, Transactional NTFS atomic DLL replacement, and the user-startable MareBackup scheduled task to load a malicious bcrypt.dll from the PowerShell application directory as SYSTEM.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets match these IOCs, which detections are missing, which campaigns to expect next, and what to do in the next 30 minutes.

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IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution1

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping10

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.

Back to malware

MalwareUsed by 1 actor

FalconFlank

For your environment

Hunt this family in your stack

Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.

Start free trial

THREAT ACTORS

Groups observed using it

1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

View more details

Nightmare-Eclipse

FalconFlank is a local privilege escalation from standard user to NT AUTHORITY\SYSTEM targeting CrowdStrike Falcon Sensor's Microsoft Office file malicious macro removal response action.

via cyderes blogcyderes.com

MITRE ATT&CK

Techniques & procedures

10 distinct techniques documented for this family, organized by ATT&CK tactic.

Resource Development

1 technique

T1587.004ExploitsEvidence1

Le chercheur anonyme opérant sous le pseudonyme Nightmare Eclipse a publié un exploit d’élévation de privilèges... Le PoC est disponible publiquement sur GitHub.

Execution

5 techniques

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

T1059.003Windows Command ShellEvidence1

L’exploitation réussie permet d’ouvrir une invite de commande avec des privilèges SYSTEM.

T1204.002Malicious FileEvidence2

“FalconFlank ... abuses the Office malicious macro remediation workflow in CrowdStrike Falcon Sensor.”

T1574.001DLLEvidence1

T1574.006Dynamic Linker HijackingEvidence1

“Restrict the creation of NTFS symbolic links by non-privileged users where possible.”

Persistence

1 technique

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

Privilege Escalation

3 techniques

T1053.005Scheduled TaskEvidence2

“a built-in Windows scheduled task then loads [the malicious payload] as SYSTEM.”

T1068Exploitation for Privilege EscalationEvidence10

T1134Access Token ManipulationEvidence1

Stealth

4 techniques

T1027Obfuscated Files or InformationEvidence1

"or obfuscate the PoC"

T1134Access Token ManipulationEvidence1

T1574.001DLLEvidence1

T1574.006Dynamic Linker HijackingEvidence1

“Restrict the creation of NTFS symbolic links by non-privileged users where possible.”

Other

1 technique

T1562.001Disable or Modify ToolsEvidence1

"if you want to test you either have to add it to the exclusions"

ACTIVITY FEED

Recent activity

1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

1 SOURCESView more in app

cyderes blogNews

Sep 8, 2026

Nightmare-Eclipse Zero-Days Hit CrowdStrike, NVIDIA, Avast & More

What this page doesn’t show

The version that knows your environment.

Start free trial

IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution1

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping10

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.