Threat Intelligence Database

From September to December 2024, incidents involving CrossC2, an extension tool for Cobalt Strike Beacon on Linux, were confirmed. The attacker used CrossC2 along with other tools like PsExec, Plink, and Cobalt Strike to penetrate AD. A custom malware called ReadNimeLoader was used as a loader for Cobalt Strike. The campaign may have affected multiple countries. CrossC2 is an unofficial Beacon and builder compatible with Cobalt Strike 4.1+, designed for Linux and macOS. It contains anti-analysis features and encrypted configuration data. The attack flow involved java.exe, ReadNimeLoader, and OdinLdr to execute Cobalt Strike Beacon. Other tools used include SystemBC, GetNPUsers, and privilege escalation tools. The campaign shows potential connections to BlackBasta based on similar characteristics.

MediumMalwareGermanyFranceUnited Kingdom+7#readnimeloader#systembc#crossc2

An attacker with local access the to medical office computer can escalate his Windows user privileges to "NT AUTHORITY\SYSTEM" by exploiting a race condition in the Elefant Update Service during the repair or update process. When using the repair function, the service queries the server for a list of files and their hashes. In addition, instructions to execute binaries to finalize the repair process are included. The executables are executed as "NT AUTHORITY\SYSTEM" after they are copied over to the user writable installation folder (C:\Elefant1). This means that a user can overwrite either "PostESUUpdate.exe" or "Update_OpenJava.exe" in the time frame after the copy and before the execution of the final repair step. The overwritten executable is then executed as "NT AUTHORITY\SYSTEM".

HighVulnerabilityGermanyFranceItaly+5#cve#cve-2024-50592#cwe-367