Skuggaheimar/Threat Intelligence/Oyster Backdoor
OYSTER BACKDOOR
OYSTER
MALWARE
ECRIME
Threat IntelligenceMalwareApril 6, 2025•15 min read

Oyster Backdoor: Threat Intelligence Profile

Emerging backdoor

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Oyster Backdoor (also known as Oyster, Broomstick) is a malware active since 2024. Emerging backdoor. Key characteristics include: DLL side-loading, system reconnaissance, C2 communication, fake software installer delivery.

Overview & Background

Emerging backdoor. First identified in 2024, this threat is attributed to eCrime.

Threat Assessment

Oyster Backdoor remains an active threat. Organizations should implement detection rules and monitor for indicators associated with this malware.

Technical Analysis

Oyster Backdoor employs the following capabilities and techniques:

MITRE ATT&CK Mapping

TacticTechniqueUsage
Initial AccessT1566.001 Phishing AttachmentCommon delivery vector
ExecutionT1204.002 Malicious FileUser-triggered execution
PersistenceT1547.001 Registry Run KeysAutostart persistence
Defense EvasionT1027 Obfuscated FilesPayload obfuscation
C2T1071.001 Web ProtocolsHTTP/HTTPS C2

Detection & Defense

Defend Against Oyster Backdoor

Mjolnir Security provides detection and response capabilities against Oyster Backdoor and similar threats.

Threat DetectionIncident ResponseThreat HuntingMDR ServicesThreat Intelligence
  • Proactive Threat Hunting Hunt for Oyster Backdoor indicators and TTPs within your environment.
  • Threat Intelligence Monitor Oyster Backdoor campaigns and infrastructure changes.
  • 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
Written by: Mjolnir Security  |  Published: April 6, 2025
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