Dark Web Profile: Ymir Ransomware

Attribute	Details
Threat Actors	Ymir ransomware group; RustyStealer malware as initial infection vector.
Campaign Overview	Global ransomware campaign targeting organizations with advanced in-memory execution techniques.
Target Regions	Colombia, Pakistan, Australia, Ukraine; possible ties to Central African countries through Lingala code comments.
Methodology	Initial access via RustyStealer; in-memory execution; ChaCha20 encryption; persistence via scheduled tasks/system service.
Product Targeted	Business-critical files; operational and sensitive data.
Malware Reference	Ymir ransomware, RustyStealer.
Tools Used	ChaCha20 encryption algorithm, memory manipulation functions (e.g., malloc, memmove), and scheduled tasks.
Vulnerabilities Exploited	Uses stolen credentials from RustyStealer infections; relies on poor access controls and unpatched systems.
TTPs	– File and Directory Discovery (T1083) – System Information Discovery (T1082) – Data Encryption for Impact (T1486) – Virtualization/Sandbox Evasion (T1497.003).
Attribution	Kaspersky researchers; potential ties to Central Africa suggested by code language.
Recommendations	– Multi-layered security: MFA, EDR, PoLP, and patch management – Isolated backups – Dark Web and network monitoring.
Source	SOCRadar

Read full article: https://socradar.io/dark-web-profile-ymir-ransomware/

Disclaimer: The above summary has been generated by an AI language model