TellYouThePass ransomware resurges and exploits Log4Shell flaw
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2021-44228 | JNDI Injection Remote Code Execution in Apache Log4j2 (Log4Shell) Apache Log4j2, an extremely widely used Java logging library, fails to protect its JNDI lookup feature against attacker-controlled JNDI-related endpoints (CWE-20, CWE-502), so crafted text processed by the logger causes the Java runtime to fetch and load attacker-supplied objects, leading to remote code execution. The flaw is triggered whenever attacker-controlled input reaches the logging API and is parsed for JNDI lookups, a pattern common in web servers and enterprise Java applications that log user-supplied fields such as headers or form values. Successful exploitation yields arbitrary code execution under the privileges of the affected application, giving attackers a foothold for lateral movement, data theft, and ransomware deployment. Any Java application or product that ships or bundles an affected Apache Log4j2 release is exposed, making this one of the most broadly deployed vulnerabilities ever disclosed. Exploitation is confirmed in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2021-12-10 with known ransomware use, and EPSS assigns a 100% probability of exploitation within 30 days. Do: Inventory all Java applications and dependencies for Apache Log4j2 and apply the vendor's patched updates, or remove affected assets from the network, as required by CISA's KEV catalog. Where updates are not yet available, use the temporary mitigations in CISA's ED-22-02 recommended-mitigation guidance, such as disabling message lookups, only until patches are applied. Prioritize internet-facing and business-critical systems and hunt for exploitation activity given known ransomware use. | 10.0 | 100% | KEV ransomware PoC ×9 |
| masshundreds of millions of Java applications/devices, with hundreds of thousands of internet-exposed services |
Full article365 words · extracted from securityaffairs.com · click to collapse
Pierluigi Paganini
December 19, 2021
The TellYouThePass ransomware resurged and exploits the Apache Log4j flaw (Log4Shell) to target both Linux and Windows systems.
Researchers from KnownSec 404 Team and Sangfor Threat Intelligence Team reported that the TellYouThePass ransomware resurged and is exploiting the Apache Log4j CVE-2021-44228 flaw to target both Linux and Windows systems.
“On December 13, Sangfor’s terminal security team and Anfu’s emergency response center jointly monitored a ransomware called Tellyouthepass, which has attacked both platforms. Sangfor has captured a large number of Tellyouthepass ransomware interception logs” reads the analysis published by Sangfor. “It is worth noting that this is not the first time that Tellyouthepass ransomware has used high-risk vulnerabilities to launch attacks. As early as last year, it had used Eternal Blue vulnerabilities to attack multiple organizational units.” add the experts.
The TellYouThePass ransomware has remained inactive since the summer of 2020, the threat mainly affected Chinese users.
Twitter user @80vul reported that a piece of the ransomware was employed in an attack on an old system that contained an internet-facing Log4j2 RCE vulnerability.
According to Curated Intelligence, ID-Ransomware (IDR) metric confirmed a spike in the submissions for this ransomware.
“Curated Intel member @PolarToffee responded with an ID-Ransomware (IDR) metric, proving that on December 13th, more than 30 samples of “TellYouThePass” ransomware were submitted to IDR, indicating that “a very sudden spike in submissions for what is a very old ransomware [that day].” Toffee further elaborates that she is “not saying they are using log4j2 but that’s certainly interesting.”” reported Curated Intelligence.
As reported by Bleeping Computer, the researcher German Fernandez also spotted a Linux version of the ransomware that is also able to harvests SSH keys and moves laterally throughout victims’ networks.
Unfortunately TellYouThePass isn’t the unique ransomware exploiting the Log4Shell flaw in its operations, the Conti ransomware gang is the first ransomware operation exploiting the Log4Shell vulnerability to target VMware vCenter Servers.
BitDefender also reported that threat actors are exploiting the flaw to spread a ransomware dubbed Khonsari being installed directly via Log4Shell exploits.
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