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C2 communications HTTP statuses 422-429 (IETF RFC 7231, 6585, 4918) are the async commands from C2
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Classroom Contents
HTTP Statuses as C2 Commands and Compromised TLS
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- 1 Intro
- 2 The plan
- 3 How it all started
- 4 Why another trojan? - Keylogging? May be too loud - Decrypting? May be not in reasonable time with current TLS Certificates pre-installation? Could facilitate MITM, but what about NAT?
- 5 "Client hello" field
- 6 PRNG to mark it
- 7 Chrome and Firefox To patch browsers' PRNG functions in memory and TLS handshake developers have to analyze Firefox sources Chrome binaries
- 8 Silently marked
- 9 Why on the fly? Once our telemetry shows new URLs and that time installers were available on the warez web-site
- 10 Infection chain
- 11 C2 communications HTTP statuses 422-429 (IETF RFC 7231, 6585, 4918) are the async commands from C2
- 12 Encryption
- 13 Some math inside
- 14 To do or to use? Don't reinvent the wheel just realign it.
- 15 It you decide to do In config: version, target ID, URL. Almost certainly constructed with builder
- 16 Second way pros Knowledge separation
- 17 First way pros Speed for the first sample
