Summary:
The emergence of Ymir ransomware introduces sophisticated tactics that challenge traditional cybersecurity defenses. Originating from the RustyStealer malware, Ymir operates stealthily in memory, making it a significant threat to organizations globally. This article outlines its operational tactics, impacts, and essential mitigation measures.
#YmirRansomware #CyberThreats #AdvancedMalware
The emergence of Ymir ransomware introduces sophisticated tactics that challenge traditional cybersecurity defenses. Originating from the RustyStealer malware, Ymir operates stealthily in memory, making it a significant threat to organizations globally. This article outlines its operational tactics, impacts, and essential mitigation measures.
#YmirRansomware #CyberThreats #AdvancedMalware
Keypoints:
Ymir ransomware is a new strain identified by Kaspersky, first observed in July 2024.
It gains initial access through the RustyStealer infostealer malware.
Ymir operates primarily in memory to avoid detection and minimize traces on hard drives.
It employs the ChaCha20 encryption algorithm to lock files, targeting critical business file types.
The ransomware has a global reach, affecting countries like Colombia, Pakistan, Australia, and Ukraine.
Ymir uses unique elements such as the African Lingala language in its code comments.
To defend against Ymir, organizations should adopt a multi-layered security strategy, including patch management and employee training.
MITRE Techniques
File and Directory Discovery (T1083): Used to gather information about files and directories on the system.
System Information Discovery (T1082): Gathers details about the system’s configuration and environment.
Command and Scripting Interpreter: PowerShell (T1059.001): Executes commands and scripts using PowerShell.
Data Encrypted for Impact (T1486): Encrypts files to disrupt operations and demand ransom.
Virtualization/Sandbox Evasion: Time Based Evasion (T1497.003): Evades detection by manipulating time-based checks in virtual environments.
Indicator Removal: File Deletion (T1070.004): Deletes files to cover tracks and hinder forensic analysis.
Process Discovery (T1057): Identifies running processes on the system.
Shared Modules (T1129): Utilizes shared modules to execute malicious payloads.
Obfuscated Files or Information (T1027): Uses obfuscation techniques to hide malicious code.
IoC:
[File Hash] 3648359ebae8ce7cacae1e631103659f5a8c630e
[File Hash] fe6de75d6042de714c28c0a3c0816b37e0fa4bb3
[File Hash] f954d1b1d13a5e4f62f108c9965707a2aa2a3c89 (INCIDENT_REPORT.pdf)
[File Hash] 5ee1befc69d120976a60a97d3254e9eb
[File Hash] 5384d704fadf229d08eab696404cbba6
[File Hash] 39df773139f505657d11749804953be5
[File Hash] 8287d54c83db03b8adcdf1409f5d1c9abb1693ac8d000b5ae75b3a296cb3061c
[File Hash] 51ffc0b7358b7611492ef458fdf9b97f121e49e70f86a6b53b93ed923b707a03
[File Hash] b087e1309f3eab6302d7503079af1ad6af06d70a932f7a6ae1421b942048e28a
[IP Address] 74.50.84.181:443
[IP Address] 94.158.244.69:443
[IP Address] 5.255.117.134:80
[IP Address] 85.239.61.60
Full Research: https://socradar.io/dark-web-profile-ymir-ransomware/