Malware
OysterLoader
- First Reported
- Jul 23, 2024
- Latest Reported
- Sep 3, 2026
Reported Context (5)
- Impersonated Microsoft Teams and Google Authenticator in malvertising campaigns to deliver CleanUpLoader, which was in turn used to drop the Vidar infostealer on victim systems Recorded Future Reports 215 Actively Exploited CVEs and Expanding Supply-Chain Threats in H1 2026
- These samples are attributed to OysterLoader (also known as CleanUpLoader or Broomstick), another backdoor that Vanilla Tempest refuses to quit using. Huntress Details Gootloader’s Return, WOFF2 Evasion and Rapid Domain Controller Compromise
- Oyster, also known as Broomstick or CleanUpLoader, is a C++ based backdoor malware first identified in July 2023. It enables remote access to infected systems, offering features such as command-line interaction and file SEO-Poisoned Fake PuTTY Downloads Deliver Oyster Backdoor
- Also known as Broomstick and CleanUpLoader, Oyster first appeared in July 2023. The backdoor collects host details and communicates with its command-and-control (C2) server via TLS, using encoded HTTP data to transfer Researchers Identify Fresh Infrastructure Linked to the Oyster Backdoor
- Oyster backdoor, also known as Broomstick (IBM) and CleanUpLoader (RussianPanda – X), has been linked to malvertising campaigns mimicking popular software. On June 21st, Rapid7 described how attackers disguised the Researchers Identify Suspected Oyster Backdoor Infrastructure Using JARM and HTML Hashes
CVE (5)
Malware (56)
People (3)
Threat Actors (20)
MITRE ATT&CK (28)
Vendors (30)
Products (58)
Tools (16)
Industries (10)
Countries (13)
Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.