Threats Tagged 'c2-communication'

A new post-exploitation red team tool named Splinter has been discovered on customer systems through Advanced WildFire's memory scanning capabilities. Developed in Rust programming language, Splinter is exceptionally large at around 7MB due to statically linked libraries. The tool uses a JSON configuration structure containing implant ID, C2 server details, and operational parameters. It operates through a task-based model with capabilities including Windows command execution, remote process injection, file upload/download, cloud service information gathering, and self-deletion. Communication with the C2 server occurs via HTTPS using specific URL paths for task synchronization, heartbeat connections, and file transfers. While not as sophisticated as Cobalt Strike, Splinter represents a growing variety of penetration testing tools that could potentially be misused by threat actors.

ACRStealer, a sophisticated Malware as a Service, has evolved with enhanced evasion techniques and C2 communication strategies. It employs low-level syscalls and AFD for stealthy operations, bypassing user-mode hooks. The malware uses layered communication, establishing raw TCP connections followed by SSL/TLS over SSPI. ACRStealer's data-stealing capabilities are extensive, targeting browsers, Steam accounts, and performing victim fingerprinting. It can execute secondary payloads and capture screenshots. The malware shows an active infection pattern in countries like the USA, Mongolia, and Germany, communicating with specific IP addresses and domains. Recent developments indicate a shift to LummaStealer, suggesting ongoing threat actor activities targeting gaming platforms and social media.

MediumMalwareUnited StatesGermanyMongolia#hijackloader#data-theft#gaming-malware

A suspicious Python package named termncolor was discovered, which imports a malicious dependency called colorinal. This multi-stage malware operation leverages DLL sideloading to decrypt payloads, establish persistence, and conduct command-and-control communication, ultimately leading to remote code execution. The attack begins with the execution of terminate.dll, which decrypts and deploys two files: vcpktsvr.exe and libcef.dll. The malware achieves persistence through a registry entry and gathers system information. It communicates with a C2 server using Zulip traffic patterns for disguise. The threat actor's profile and activities on the Zulip platform were analyzed, revealing patterns in their tactics and behavior.

MediumCampaignGermanyFranceUnited Kingdom+5#c2-communication#zulip#termncolor