Ransomware

CryptoWire with Decryption Key Included

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AhnLab SEcurity intelligence Center (ASEC) recently discovered the distribution of CryptoWire, a ransomware that was once viral in 2018. CryptoWire is mainly distributed via phishing emails and is made using Autoit script. Main Features The ransomware copies and pastes itself in the path “C\Program Files\Common Files,” and registers a schedule to the task scheduler to maintain persistence.     The malware explores the local and connected network environments to expand the file encryption process, saves the data as domaincheck.txt in…

Data Leak Detected by AhnLab EDR (vs. Ransomware Threat Actors)

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Ransomware threat actors have been extorting money after taking control over organizations’ internal networks, distributing ransomware, encrypting systems, and holding system restoration for ransom. Recently, however, threat actors not only encrypts the systems but also leaks internal data and threatens to expose them publicly if the ransom is not paid. Usually, these threat actors collect data, compress them, and leak them publicly. In such processes, threat actors utilize many legitimate utility programs. These programs already allow stable transfer of large-sized…

Trigona Ransomware Threat Actor Uses Mimic Ransomware

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AhnLab SEcurity intelligence Center (ASEC) has recently identified a new activity of the Trigona ransomware threat actor installing Mimic ransomware. Like past cases, the recently detected attack targets MS-SQL servers and is notable for exploiting the Bulk Copy Program (BCP) utility in MS-SQL servers during the malware installation process. ASEC first discovered a case of attack using BCP to install Mimic in early January 2024. In mid-January 2024, there were similar types of attacks identified where Trigona was installed instead…

LockBit Ransomware Distributed via Word Files Disguised as Resumes

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AhnLab SEcurity intelligence Center (ASEC) has identified that LockBit ransomware is being distributed via Word files since last month. A notable point is that the LockBit ransomware is usually distributed by disguising itself as resumes, and recently found malicious Word files were also disguised as resumes [1]. The distribution method of LockBit ransomware using external URLs in Word files was first found in 2022 [2]. The recently discovered file names of malicious Word files are as follows.   File name [[[231227_Yang**]]].docx…

Mimo CoinMiner and Mimus Ransomware Installed via Vulnerability Attacks

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AhnLab SEcurity intelligence Center (ASEC) recently observed circumstances of a CoinMiner threat actor called Mimo exploiting various vulnerabilities to install malware. Mimo, also dubbed Hezb, was first found when they installed CoinMiners through a Log4Shell vulnerability exploitation in March 2022. Up until now, all of the attack cases involved the installation of XMRig CoinMiner called Mimo Miner Bot in the final stage. However, there were other pertinent cases where the same threat actor installed Mimus ransomware, proxyware, and reverse shell…