One of our honeypots detected a URL spreading a botnet with a Monero miner bundled with a Perl-based backdoor component. The routine caught our attention as the techniques employed are reminiscent as those used in the Outlaw hacking group’s previous operation.
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In TA505 group’s latest campaign, they started using HTML attachments to deliver malicious .XLS files that lead to downloader and backdoor FlawedAmmyy, mostly to target users in South Korea. We also touch on the latest TA505 developments, including an email stealer, their use of legitimate software and MSI Installer, and more.
Read More We found new campaigns that appear to wear the badge of MuddyWater. Analysis of these campaigns revealed the use of new tools and payloads, which indicates that the well-known threat actor group is continuously developing their schemes. We also unearthed and detailed our other findings on MuddyWater, such as its connection to four Android malware families and its use of false flag techniques, among others, in our report “New MuddyWater Findings Uncovered: Threat Actors Used Multi-Stage Backdoor, False Flags, Android Malware, and More.”
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We found cryptocurrency-mining activity that involves the exploitation of the Oracle WebLogic server vulnerability CVE-2019-2725 with the interesting behavior of using certificate files as an obfuscation tactic.
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Abusing PowerShell to deliver malware isn’t new; it’s actually a prevalent technique that many fileless threats use. We regularly encounter these kinds of threats, and Trend Micro behavior monitoring technology proactively detects and blocks them. We have smart patterns, for instance, that actively detect scheduled tasks created by malicious PowerShell scripts. We also have network rules that detect, for example, indications of activities like Server Message Block (SMB) vulnerabilities being exploited, potential brute-force attempts, and illicit cryptocurrency mining-related communications.
With that said, a sudden spike of these activities is unusual to us. Feedback from our Smart Protection Network™ revealed that this recent wave of attacks were mostly targeting China-based systems. The attacks, which are still ongoing, were first observed on May 17; the attacks peaked on May 22 and has since steadied.
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