Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
September 13, 2022Rewterz Threat Alert – Bitter APT Group – Active IOCs
September 13, 2022Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
September 13, 2022Rewterz Threat Alert – Bitter APT Group – Active IOCs
September 13, 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 languaguage 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
- 6c780c5c1b162eeb14d2180589848404
- a13f4e2adcab12927e39aaa21d33ce74
SHA-256
- 9f423f06bf449266ddea3e0a3673d1109ff5415f4bcc52303902c57aee9b0b5b
- 6d4cb4dcae0ad95c2112b2b2c110e296475daf2f64cf64720caec172555ba6f5
SHA-1
- 5e4f3068add8b4c949007a2e02878b210b00a4b2
- d68a6dcaad2d465846f697b508c27faaaa9e6a0e
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 implement 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.