Rewterz Threat Alert – APT Group Gamaredon – Active IOCs
November 17, 2022Rewterz Threat Advisory – CVE-2022-41800 – F5 BIG-IP Vulnerability
November 18, 2022Rewterz Threat Alert – APT Group Gamaredon – Active IOCs
November 17, 2022Rewterz Threat Advisory – CVE-2022-41800 – F5 BIG-IP Vulnerability
November 18, 2022Severity
High
Analysis Summary
Hive is one of the quickest evolving ransomware families which was first observed in June 2021 and likely operates as an affiliate-based ransomware, employs a wide variety of tactics, techniques, and procedures (TTPs), creating significant challenges for defense and mitigation. Hive ransomware uses multiple mechanisms to compromise business networks, including phishing emails with malicious attachments to gain access and Remote Desktop Protocol (RDP) to move laterally once on the network. After compromising a victim network, Hive ransomware actors exfiltrate data and encrypt files on the network. The actors leave a ransom note in each affected directory within a victim’s system, which provides instructions on how to purchase the decryption software. The ransom note also threatens to leak exfiltrated victim data on the Tor site, “HiveLeaks.”
The latest variant introduced by this ransomware is written in Rust language as opposed to the previous variants, which were written in GoLang or Go.
According to researchers:
The new variation employs a unique collection of algorithms, including Elliptic Curve Diffie-Hellmann (ECDH) with Curve25519 and XChaCha20-Poly1305″ (authenticated encryption with ChaCha20 symmetric cipher)
The latest Hive version approaches file encryption in a distinctive manner. It produces two sets of keys in memory, uses them to encrypt files, and then encrypts and writes the sets to the root of the drive it encrypts, with a .key extension.
Impact
- Unauthorized Access
- Data Exfiltration
- File Encryption
Indicators of Compromise
MD5
- 38577f52466ab3a944eff42f5d8213fe
- 233385521005603d5a2a9b9d465eb9f5
SHA-256
- 3be3558dbb137a8ba57572f5e10cc29b423f583cd4441d5a91b812080daa48e0
- bf5c6c9e954c36f45249e71128eee2c019a706a659e05bc8759167ffdf8841f9
SHA-1
- c451613bbae7e9377fab7d40dbb08504d8dc52a4
- 2d8d3fe0ec2fdbb58fd82bba3c35dd6da40187a4
Remediation
- Search for IOCs in your environment.
- Block all threat indicators at your respective controls.
- Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
- Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
- Emails from unknown senders should always be treated with caution.
- Never trust or open ” links and attachments received from unknown sources/senders