We have no reliable information about how the backdoor was distributed. So we decided to unpick Calisto to see what it is and why its development was stopped (or was it?). Malware for macOS is not that common, and this sample was found to contain some suspiciously familiar features. But for two whole years, until May 2018, Calisto remained off the radar of antivirus solutions, with the first detections on VT appearing only recently. The malware was uploaded to VirusTotal way back in 2016, most likely the same year it was created. We recently came across one such sample: a macOS backdoor that we named Calisto. Also of interest are developmental prototypes that have had limited distribution or not even occurred in the wild. ![]() OSAMiner is a cryptocurrency miner, a Monero mining Trojan that uses run-only AppleScripts targeting Mac computers.An interesting aspect of studying a particular piece of malware is tracing its evolution and observing how the creators gradually add new monetization or entrenchment techniques. OSAMiner was first detected in 2015 and is still successfully used by cyber criminals due to its complex structure (use of run-only AppleScript files), which prevents researchers from fully studying it and preventing the attacks. Research shows that OSAMiner embeds one run-only AppleScript inside another and uses the addresses on public websites to download an open-source Monero miner called XMR-STAK-RX – Free Monero RandomX Miner. The OSAMiner setup script uses a tool that prevents the infected computer from entering sleep mode. The script is designed to kill running processes belonging to certain popular system monitoring and cleaning tools. Threat Summary: NameĪvast (MacOS:Agent-JE ), AVG (MacOS:Agent-JE ), ESET-NOD32 (OSX/OSAMiner.C), Kaspersky (HEUR:), Full List ( VirusTotal) Symptoms of having OSAMiner installed on macOS are system freezes, problems with opening Activity Monitor (Activity Monitor.app), and higher CPU usage. Pirated copies of games and software (like Microsoft Office, League of Legends) Higher CPU usage, system freezes, problems with accessing/using Activity Monitor #Macos malware years runonly applescripts five full# Higher electricity bills, loss of unsaved data, hardware overhear, decrease in computer performance To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner. To use full-featured product, you have to purchase a license for Combo Cleaner. Combo Cleaner is owned and operated by Rcs Lt, the parent company of read more. In summary, cyber criminals distribute OSAMiner to mine Monero cryptocurrency using victims' computer resources/hardware. OSAMiner differs from other miners in that it targets Mac users and is very difficult to detect and analyze. Some other cryptocurrency mining malware examples are Bird Miner and LoudMiner. ![]() Research shows that OSAMiner is distributed via pirated copies of various software programs and games such as, for example, League of Legends and Microsoft Office. Malware (including ransomware) is usually distributed via malspam campaigns, unofficial software activation ('cracking') tools, Trojans, dubious file/software download sources, and fake software updating tools. #Macos malware years runonly applescripts five software# When cyber criminals attempt to distribute malware via malspam campaigns, they send emails that contain malicious attachments or download links for malicious files. Typically, they disguise their emails as official and important. #Macos malware years runonly applescripts five software#. ![]()
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