![]() Log4Shell has become a focal point for threat actors, including suspected nation state actors who’ve been observed investigating Log4j2, AdvIntel researchers noted. reverse bash shells for future attacks, Mirai and other botnets, and backdoors. Within hours of public disclosure of the flaw, attackers were scanning for vulnerable servers and unleashing quickly evolving attacks to drop coin-miners, Cobalt Strike, the Orcus remote access trojan (RAT). Khonsari ransomware was just one malware that’s been thrown at vulnerable servers over the course of the Log4j saga. That means that Khonsari is more of a wiper, meant to troll Minecraft users by taking down their servers, rather than ransomware. First spotted by Bitdefender in Log4Shell attacks, the ransomware’s demand note lacked a way to contact the operators to pay a ransom. As Microsoft has reported, Khonsari was locking up Minecraft players via unofficial servers. The emphasis is on “major,” given that the first ransomware group to target Log4Shell was a ransomware newcomer named Khonsari. “This is the first time this vulnerability entered the radar of a major ransomware group,” according to the writeup. That led to scanning for vulnerable systems that AdvIntel first tracked the next day, on Dec. 12 began to chat about exploiting the Log4Shell vulnerability as an initial attack vector. Conti Winds Up Its Exploit MachineĪccording to the Thursday AdvIntel writeup, from Vitali Kremez and Yelisey Boguslavskiy, multiple Conti group members on Dec. 11, but its patch, Log4J2, was found to be incomplete in certain non-default configurations and paved the way for denial-of-service (DoS) attacks in certain scenarios.Īs if two bugs aren’t enough, yet another, similar but distinct bug was discovered last week in the Log4J logging library. 10 – a bug that came under attack within hours – Conti group members were discussing how to exploit it as an initial attack vector, according to AdvIntel.Īpache patched the bug on Dec. Within two days of the public disclosure of the vulnerability in Apache’s Log4j logging library on Dec. The VMWare servers are on a dismayingly long list of affected components and vendors whose products have been found to be vulnerable to Log4Shell. 15, Conti was looking for vulnerable VMWare networks for initial access and lateral movement. With regards to the final link in the attack chain, the Conti gang last week zeroed in on … Kerberoasting, a common, pervasive attack that exploits a combination of weak encryption and poor service account password hygiene, is a post-exploitation attack that extracts service account credential hashes from Active Directory for offline cracking. As Microsoft puts it, “Missing administrative shares typically indicate that the computer in question has been compromised by malicious software.” Next up comes … Administrative shares are hidden network shares created by Microsoft’s Windows NT operating systems that grant system administrators remote access to every disk volume on a network-connected system. Human Exploitation, which describes the stage of an attack in which threat actors personally investigate the network, looking for critical data, analyzing the network structure, defining the most important network shares, and looking at ways to elevate privileges, among other things. ![]() ![]() It gives threat actors direct access to targets and, according to Boguslavskiy, precedes… Cobalt Strike, the legitimate, commercially available tool used by network penetration testers on infected devices and pervasively adopted by cybercriminals.Emotet is a botnet that resurfaced last month on the back of TrickBot, now with the ability to directly install …. ![]() 20, the attack chain has taken the following form, AdvIntel’s Yelisey Boguslavskiy told Threatpost: Emotet -> Cobalt Strike -> Human Exploitation -> (no ADMIN$ share) -> Kerberoast -> vCenter ESXi with log4shell scan for vCenter. The sophisticated Russia-based Conti group – which Palo Alto Networks has called “one of the most ruthless” of dozens of ransomware groups currently known to be active – was in the right place at the right time with the right tools when Log4Shell hit the scene 10 days ago, security firm Advanced Intelligence (AdvIntel) said in a report shared with Threatpost on Thursday.Īs of today, Monday, Dec. The Conti ransomware gang, which last week became the first professional crimeware outfit to adopt and weaponize the Log4Shell vulnerability, has now built up a holistic attack chain.
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