By Ken Hsu, Durgesh Sangvikar, Zhibin Zhang and Chris Navarrete
On May 29, 2020, Unit 42 researchers discovered a new variant of a hybrid cryptojacking malware from numerous incidents of CVE-2019-9081 exploitation in the wild. A closer look revealed the malware, which we’ve dubbed “Lucifer”, is capable of conducting DDoS attacks and well-equipped with all kinds of exploits against vulnerable Windows hosts. The first wave of the campaign stopped on June 10, 2020. The attacker then resumed their campaign on June 11, 2020, spreading an upgraded version of the malware and wreaking havoc. The sample was compiled on Thursday, June 11, 2020 10:39:47 PM UTC and caught by Palo Alto Networks Next-Generation Firewall. At the time of writing, the campaign’s still ongoing.
Lucifer is quite powerful in its capabilities. Not only is it capable of dropping XMRig for cryptojacking Monero, but it’s also capable of command and control (C2) operation and self-propagation through the exploitation of multiple vulnerabilities and credential brute-forcing. Additionally, it drops and runs EternalBlue, EternalRomance, and DoublePulsar backdoor against vulnerable targets for intranet infections.
The exhaustive list of weaponized exploits includes CVE-2014-6287, CVE-2018-1000861, CVE-2017-10271, ThinkPHP RCE vulnerabilities (CVE-2018-20062), CVE-2018-7600, CVE-2017-9791, CVE-2019-9081, PHPStudy Backdoor RCE, CVE-2017-0144, CVE-2017-0145, and CVE-2017-8464.
These vulnerabilities have either “high” or “critical” ratings due to their trivial-to-exploit nature and their tremendous impact inflicted on the victim. Once exploited, the attacker can execute arbitrary commands on the vulnerable device. In this case, the targets are Windows hosts on both the internet and intranet, given that the attacker is leveraging certutil utility in the payload for malware propagation. Fortunately, the patches for these vulnerabilities are readily available.
While the vulnerabilities abused and attack tactics leveraged by this malware are nothing original, they once again deliver a message to all organizations, reminding them why it’s utterly important to keep systems up-to-date whenever possible, eliminate weak credentials, and have a layer of defenses for assurance.
At the time of writing this blog, the XMR wallet has paid 0.493527 XMR, which converts to approximately $32 USD.
Palo Alto Networks Next-Generation Firewalls can detect and block all the exploit attempts from this kind of malware family.
