VirusTotal Multisandbox+= ELF DIGEST
In the words of the founder Tolijan Trajanovski:
ELF DIGEST is a cloud-based Linux malware analysis service provided to security researchers, analysts, and academics. The service performs static, behavioral, and network analysis to extract IoCs and IoAs. The static analysis searches for IoCs in the strings and may also identify obfuscation in the form of string encoding and executable packing. The behavioral analysis can recognize various malicious actions, including VM detection, anti-debugging, persistence, process injection, loading of kernel modules, firewall configuration changes, and others. The network analysis can identify C2 endpoints, resolved domains, HTTP requests, and port scanning. In addition, ELF DIGEST utilizes the open-source malware labeling tool AvClass to determine the most probable malware family the analyzed sample belongs to. The currently supported CPU architectures include ARMv5, ARMv7, MIPS, x86 and x86_64. The detailed findings of the analysis are presented in an aggregated view and can be also downloaded as a JSON report.
Let’s take a deeper dive on some samples:
Botnet on ARM with iptables kernel modules
In the shell commands we can observe the iptables firewall stopped and tables flushed. This would allow the malware to communicate without the firewall obstructing it.
The linux kernel modules being loaded, which are most likely related to the iptables command line interactions.
We can explore other pivots either on the relationships tab, or within VirusTotal Graph. Here we can see more details with respect to the command and control infrastructure as well as relations to other files, URL, and IPs.
Mozi botnet with bittorrent
In the HTTP requests section, scanning for other vulnerable devices on the internet
Other Interesting samples to have a look at:
- Mirai 19907fba39b0065fea0047b533d3d1f61d46c49e8ad78f65f7ad6d5d906d2d7b
- Service Scanning: cd02800b747b27a65382132770c77823304404dc0611917a21b423727d058ae1
- A coin miner detecting its environment: 6f445252494a0908ab51d526e09134cebc33a199384771acd58c4a87f1ffc063
ELF DIGEST is a great addition to VirusTotal, and will help further shine the spotlight on linux malware. Happy Hunting!