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1. BITDEFENDER BLOCKS CTIVO GENERATOR
2. BITDEFENDER BLOCKS CTIVO VERIFICATION
3. BITDEFENDER BLOCKS CTIVO SOFTWARE

We have recovered the master key for generating the file encryption key partially, to enable the decryption of data encrypted by Hive ransomware. By analyzing the encryption process of Hive ransomware, we confirmed that vulnerabilities exist by using their own encryption algorithm. To minimize the damage caused by Hive Ransomware and to help victims recover their files, we analyzed Hive Ransomware and studied recovery methods.

Hive ransomware has caused immense harm, leading the FBI to issue an alert about it. In this paper, we analyzed Hive ransomware, which appeared in June 2021. As data recovery is impossible if the encryption key is not obtained, some companies suffer from considerable damage, such as the payment of huge amounts of money or the loss of important data.

Ransomware encrypts data and demands a ransom in exchange for decryption. Thus, a lot of solutions are giving out by the researcher to overcome the problem after the attack.Īmong the many types of malicious codes, ransomware poses a major threat. However, many preventions allow the user to avoid the ransomware propagate but the system is not fully free from the ransomware attack. Otherwise, the weaknesses of security knowledge also become one of the causes. There is a lot of reason that cause the ransomware attack around the world, for example, the vulnerability of the system. The victims are only allowed to access after pay the demand using crypto-currencies such as Bitcoin. A ransom demand message will prompt the user so that they will gain the money anonymously. Ransomware attacks the victim by infecting the malicious file into the device they will encrypt and deny the victim to access it.

BITDEFENDER BLOCKS CTIVO SOFTWARE

Ransomware is one of the families of malicious software that spread quickly and cause a critical impact around the world. The development of science and technology in this era brought many advantages for peoples, organizations, enterprises, and companies merely a lot of cyber threats are occurring nowadays. To our knowledge, we report the first recovery result of Magniber v2-infected files.

BITDEFENDER BLOCKS CTIVO VERIFICATION

We exploited this vulnerability to successfully recover the encryption keys, which was by verified the result in padding verification and statistical randomness tests. In our analysis, we found a vulnerability in the PRNG of Magniber v2 developed by the attacker. We revealed the operation process of Magniber v2 including PRNG and file encryption algorithms. In this paper, we analyzed Magniber v2, which has exerted a large impact in the Asian region. For this reason, the encryption keys of malware are known to be difficult to obtain.

BITDEFENDER BLOCKS CTIVO GENERATOR

However, the encryption key is derived using a Pseudo Random Number Generator (PRNG) and is recoverable only by the attacker. Ransomware-infected files can be recovered only by obtaining the encryption key used to encrypt the files. Although user data can be maintained by various protection techniques, its safety has been threatened by the advent of ransomware, defined as malware that encrypts user data, such as documents, photographs and videos, and demands money to victims in exchange for data recovery. With the rapid increase in computer storage capabilities, user data has become increasingly important.