We break inon purpose.
THJ Security attacks your applications, networks and cloud the way a real adversary would, proves it with a working exploit, and hands you the exact path to shut it down.
Fixed quote in 2 business days · Retest included · See our research →
Scanners find noise. Attackers find paths.
A scanner reports what looks wrong. An attacker chains what actually works: a weak token here, a race there, a forgotten admin route, and suddenly it is someone else's money.
Annual checkbox pentests do not close that gap. They arrive late, test wide and shallow, and leave your engineers with a PDF full of unranked guesses.
We test the way the people who will attack you do, and we only report what we can prove.
Built by people who came up through CTFs and bug bounty on Google, AWS and open source, we run on one rule: proof, not theory.
00:00
Find and prove the issues before someone else does.
Scoped, hands-on engagements led by senior operators. Every engagement is fixed scope, fixed window, fixed price, and ends with a verified fix, not a PDF.
Penetration Testing
Web, API, mobile and network. Manual, adversary-driven, every finding backed by a working exploit.
- Exploit chains
- Fix-ready report
- Free retest
Secure Code Review
Source-level review of auth, payments and access control: the logic flaws scanners never reach.
- Line-level findings
- Threat model
- Patch review
Red Team
Goal-based, multi-vector simulation that tests detection and response, from phishing to lateral movement to exfil.
- Attack narrative
- Detection gaps
- Purple-team debrief
Cloud & Infra
Privilege-path and config review across AWS, GCP and Kubernetes, where one bug becomes a breach.
- Privilege graph
- IAM hardening
- K8s posture
Vulnerability Management
Continuous discovery, triage and re-testing. Bug-bounty-grade validation, none of the noise.
- Validated queue
- Monthly retest
- Exec dashboard
Incident Response
When it's already gone wrong: containment, forensic triage, root cause, and a plan so it doesn't recur.
- Containment plan
- Forensic timeline
- Hardening roadmap
A clear engagement, start to fixed.
Set the scope once. We test, prove, report and retest, and keep you in the loop every day. Anything critical is escalated the moment we find it.
Retest is included in every engagement. The job is done when the fix is verified, not when the invoice is sent.
Request an assessment ↗Rules of engagement
Targets, objectives and constraints agreed in writing. Fixed price, fixed window.
Hands-on exploitation
Daily comms. Criticals escalated the moment we confirm them.
Impact, repro, fix
Every finding with a working exploit and a concrete remediation, readable by engineers and execs.
Verified closed
We re-run every finding and confirm nothing new broke. Included, not billed.
Real exploits. Real fixes.
Ask for a redacted sample report before you commit to anything. Same structure, same level of detail, real findings.
See a sample report ↗How we work
- Proof, not theory. Every finding ships with a working exploit path.
- Fixable reports. Prioritised, reproducible, written for whoever remediates.
- Discretion by default. NDAs, responsible disclosure, your data handled like ours.
- Retest included. The job isn't done until the fix is verified.
- CriticalCross-tenant fund transfer via payout race
- HighIDOR on merchant payout endpoint
- HighSSRF in webhook validator reaches metadata
- MediumSession fixation on SSO callback
- LowVerbose stack traces on 500s
Real vulnerabilities. Real impact.
We hunt in the software the region runs on and work responsibly with vendors to get it fixed before it is used against anyone.
Attacker mindset. Engineer's discipline.
THJ Security is a boutique offensive-security practice in Ulaanbaatar, Mongolia, working with fintech, banking, telecom and public-sector teams across the region.
We come from the CTF and bug-bounty world, so we test like the people who actually attack you, and write like the engineers who have to fix it. Every engagement is led by a senior operator from first recon to final retest. No outsourced juniors. No scanner-and-invoice.
Tell us what you are building.
We scope an assessment and send a fixed quote, usually within two business days. Nothing you type here is stored on this site; submitting opens a pre-filled email.
- Location
- Ulaanbaatar, Mongolia · UTC+8
Response within two business days