Rewterz Threat Alert – Godlua Backdoor abuses the DNS over HTTPS (DoH) protocol

July 5, 2019

Severity

Medium

Analysis Summary

Godlua is the first malware that abuses the DNS over HTTPS (DoH) protocol to protect its command and control infrastructure.

Godlua Backdoor has a redundant communication mechanism for C2 connection, a combination of hardcoded dns name, Pastebin.com, GitHub.com as well as DNS TXT are used to store the C2 address, “At the same time, it uses HTTPS to download Lua byte-code files, and uses DNS over HTTPS to get the C2 name to ensure secure communication between the bots, the Web Server and the C2.

Impact

DDoS

Indicators of Compromise

IP(s) / Hostname(s)

198[.]204[.]231[.]250
104[.]238[.]151[.]101
43[.]224[.]225[.]220

URLs

https[:]//helegedada[.]github[.]io/test/test
https[:]//api[.]github[.]com/repos/helegedada/heihei
http[:]//198[.]204[.]231[.]250/linux-x64
http[:]//198[.]204[.]231[.]250/linux-x86
https[:]//dd[.]heheda[.]tk/i[.]jpg
https[:]//dd[.]heheda[.]tk/i[.]sh
https[:]//dd[.]heheda[.]tk/x86_64-static-linux-uclibc[.]jpg
https[:]//dd[.]heheda[.]tk/i686-static-linux-uclibc[.]jpg
https[:]//dd[.]cloudappconfig[.]com/i[.]jpg
https[:]//dd[.]cloudappconfig[.]com/i[.]sh
https[:]//dd[.]cloudappconfig[.]com/x86_64-static-linux-uclibc[.]jpg
https[:]//dd[.]cloudappconfig[.]com/arm-static-linux-uclibcgnueabi[.]jpg
https[:]//dd[.]cloudappconfig[.]com/i686-static-linux-uclibc[.]jpg
http[:]//d[.]cloudappconfig[.]com/i686-w64-mingw32/Satan[.]exe
http[:]//d[.]cloudappconfig[.]com/x86_64-static-linux-uclibc/Satan
http[:]//d[.]cloudappconfig[.]com/i686-static-linux-uclibc/Satan
http[:]//d[.]cloudappconfig[.]com/arm-static-linux-uclibcgnueabi/Satan
https[:]//d[.]cloudappconfig[.]com/mipsel-static-linux-uclibc/Satan

Malware Hash (MD5/SHA1/SH256)

870319967dba4bd02c7a7f8be8ece94f
c9b712f6c347edde22836fb43b927633
75902cf93397d2e2d1797cd115f8347a

Remediation

Block all threat indicators at your respective controls.
Keep updated patches on all critical and non-critical systems.