![]() ![]() Named OSAMiner, the malware has been distributed in the wild since at least 2015 disguised in pirated (cracked) games and software such as League of Legends and Microsoft Office for Mac, security firm SentinelOne said in a report published this week. “OSAMiner has been active for a long time and has evolved in recent months,” a SentinelOne spokesperson told ZDNet in an email interview on Monday. ![]() “From what data we have it appears to be mostly targeted at Chineses/Asia-Pacific communities,” the spokesperson added. Nested run-only AppleScripts, for the win!īut the cryptominer did not go entirely unnoticed. Adversaries may embed payloads within other files to conceal malicious content from defenses.SentinelOne said that two Chinese security firms spotted and analyzed older versions of the OSAMiner in August and September 2018, respectively.īut their reports only scratched the surface of what OSAMiner was capable of, SentinelOne macOS malware researcher Phil Stokes said yesterday. Otherwise seemingly benign files (such as scripts and executables) may be abused to carry and obfuscate malicious payloads and content. In some cases, embedded payloads may also enable adversaries to Subvert Trust Controls by not impacting execution controls such as digital signatures and notarization tickets. Īdversaries may embed payloads in various file formats to hide payloads. This is similar to Steganography, though does not involve weaving malicious content into specific bytes and patterns related to legitimate digital media formats. įor example, adversaries have been observed embedding payloads within or as an overlay of an otherwise benign binary. Adversaries have also been observed nesting payloads (such as executables and run-only scripts) inside a file of the same format. Įmbedded content may also be used as Process Injection payloads used to infect benign system processes. These embedded then injected payloads may be used as part of the modules of malware designed to provide specific features such as encrypting C2 communications in support of an orchestrator module. For example, an embedded module may be injected into default browsers, allowing adversaries to then communicate via the network. The osascript utility lets you run AppleScript from the command line. ĬomRAT has embedded a XOR encrypted communications module inside the orchestrator module. #Macos years runonly applescripts avoid detection mac os xĪ number of predefined macros to detect Apple systems and Mac OS X in particular. ĭtrack has used a dropper that embeds an encrypted payload as extra data. Invoke-PSImage can be used to embed payload data within a new image file. MacOS.OSAMiner has embedded Stripped Payloads within another run-only Stripped Payloads. The SMOKEDHAM source code is embedded in the dropper as an encrypted string. ![]() #Macos years runonly applescripts avoid detection code Īnti-virus can be used to automatically detect and quarantine suspicious files. On Windows 10, enable Attack Surface Reduction (ASR) rules to prevent execution of potentially obfuscated scripts. Monitor for newly constructed files containing large amounts of data. Abnormal file sizes may be an indicator of embedded content. Monitor contextual data about a file that may highlight embedded payloads, which may include information such as name, the content (ex: signature, headers, or data/media), file size, etc.
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