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Attackers Use Event Logs to Hide Fileless Malware

A sophisticated campaign utilizes a novel anti-detection method.

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CVE-2022-28096: Remote code execution vulnerability in /SkycaijiApp/admin/controller/Develop.php · Issue #39 · zorlan/skycaiji

Skycaiji v2.4 was discovered to contain a remote code execution (RCE) vulnerability via /SkycaijiApp/admin/controller/Develop.php.

Ransom.WannaCry Code Execution

WannaCry ransomware looks for and executes DLLs in its current directory. Therefore, we can hijack a DLL to execute our own code in order to control and terminate the malware pre-encryption. The exploit DLL checks if the current directory is "C:\Windows\System32" and if not we grab our process ID and terminate. We do not need to rely on hash signatures or third-party products, the malware vulnerability does the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as there is nothing to kill the DLL that just lives on disk waiting. From a defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.

REvil.Ransom Code Execution

REvil ransomware looks for and executes DLLs in its current directory. Therefore, we can potentially hijack a DLL to execute our own code in order to control and terminate the malware pre-encryption. The exploit dll will check if the current directory is "C:\Windows\System32" and if not we grab our process ID and terminate. We do not need to rely on hash signature or third-party products as the malware vulnerability will do the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as there is nothing to kill the DLL that just lives on disk waiting. From a defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.

Ransom.Conti Code Execution

Conti ransomware looks for and executes DLLs in its current directory. Therefore, we can potentially hijack a DLL to execute our own code to control and terminate the malware pre-encryption. The exploit dll will check if the current directory is "C:\Windows\System32". If not, we grab our process ID and terminate. We do not need to rely on hash signature or third-party products, the malware vulnerability will do the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as there is nothing to kill the DLL that just lives on disk waiting. From a defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.

Conti.Ransom Code Execution

Conti ransomware looks for and loads a DLL named "wow64log.dll" in Windows\System32. Therefore, we can drop our own DLL to intercept and terminate the malware pre-encryption. The exploit DLL will simply display a Win32API message box and call exit(). Our Conti.Ransom exploit DLL must export the "InterlockedExchange" function or it fails with an error. We do not need to rely on hash signature or third-party products, the malware vulnerability will do the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as there is nothing to kill the DLL that just lives on disk waiting. From a defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.

Aryaka, Carnegie Mellon’s CyLab to Research New Threat Mitigation Techniques

The security research partnership will focus on developing new techniques and releasing them as open source.

Syxsense Enterprise Unifies Endpoint Security and IT Management for Real-Time Vulnerability Monitoring and Remediation

IT Teams can now manage, detect, and secure all endpoints with 100% visibility across desktop, laptop, server, and mobile devices.

CVE-2022-1548: Security Updates

Mattermost Playbooks plugin 1.25 and earlier fails to properly restrict user-level permissions, which allows playbook members to escalate their membership privileges and perform actions restricted to playbook admins.