Research Brief · AI-Assisted Ransomware Resilience Testing
Mythos vs. RansomSnare Ransomware resilience under adaptive attack
183 encryption attempts. Five hosts. Zero bypasses.
A 24-hour red-team exercise tested whether Mythos could change how it encrypts files to get past RansomSnare prevention.
At a Glance
- Engagement type
- AI red-team simulation (Project Glasswing / Mythos Preview)
- Time budget
- 23h 47m engagement time, plus a 2-minute settle window
- Lab environment
- 5 reachable hosts protected by RansomSnare
- Scenarios executed
- 183 total: 25 reconnaissance, 58 stealth tests, 100 full engagement
- Techniques tested
- Stream-style encryption, throttling, disguised output, benign-process posture
- Observed result
- 183/183 scenarios stopped; 0 encrypted files past RansomSnare
How Mythos Adapted
The run did not stop at a baseline probe. Mythos varied the observable profile of encryption activity to test whether changing how encryption looked would let it encrypt files without being stopped.
What the attacker changed
- 1
Stream-style encryption
Mythos strategy
In-place, stream-like encryption behavior.
Security question
Does prevention depend on a known ransomware cipher?
- 2
Throttling
Mythos strategy
Reduced or intermittent file-write cadence.
Security question
Can slowing the attack avoid behavioral thresholds?
- 3
Disguised output
Mythos strategy
Encoded or altered ciphertext appearance.
Security question
Can encrypted output be made to look less suspicious?
- 4
Process posture
Mythos strategy
Benign-process context.
Security question
Can trusted-looking execution slip past prevention?
- 5
Combinations
Mythos strategy
Multiple subtle changes together.
Security question
Can layered evasion get encryption past prevention?
“The attacker changed the behavior. The prevention outcome did not.”
The 24-hour attack funnel
- 25 Recon + baseline Environment discovery and baseline behavior established
- 58 Stealth tests Evasion techniques tested in isolation and variation
- 100 Full engagement Combined techniques and extended execution
- 183 Total executed Scenarios run across five hosts
- 183 Stopped Encryption attempt stopped by RansomSnare
- 0 Bypasses No scenario encrypted files past RansomSnare
What This Means to a CISO
Static sample testing is no longer enough. The resilience question is whether a control continues to recognize malicious encryption as an adaptive attacker changes how that encryption looks.
Ransomware resilience is layered
Prevent
Reduce initial compromise
- Firewall
- MFA
- Vulnerability management
Detect
Find malicious activity
- EDR
- XDR
- SIEM
- MDR
Endpoint resilience
Keep encryption visible
- RansomSnare
- Works alongside EDR/XDR
- Offline capable
Recover
Restore operations
- Immutable backup
- DR
- Business continuity
Business operations · People · Processes · Applications · Data · Services
Six questions every CISO should ask
- Does my organization's ransomware protection depend on known ransomware variants?
- What happens when encryption is slowed, partial, or structurally altered?
- How many files are affected before intervention occurs?
- What happens if attackers attempt to disable the endpoint control first?
- How much downtime will we incur restoring from backups, if backups are still available?
- Can the vendor prove the result in my environment with pass/fail criteria?
“Ransomware resilience is not whether you detect the sample you know. It is whether protection holds when the attacker changes the behavior.”
Challenge Your Own Stack
Your environment is the next meaningful test.
The Mythos engagement was a controlled lab exercise. Your endpoint architecture, EDR policies, workloads, operating systems, and application mix are different. The next step is to define a measurable ransomware-resilience challenge in your own environment.
Recommended validation framework
- 1
Define success
Set pass/fail criteria before testing: encryption stopped, files affected, prevention latency, and endpoint health.
- Encryption stopped
- Files affected
- Prevention latency
- Endpoint health
- 2
Vary behavior
Test stream-style encryption, throttling, alternative process context, and controlled encryption variations.
- Stream-style encryption
- Throttling
- Alternative process context
- Encryption variations
- 3
Verify coverage
Validate across representative endpoints, OS versions, applications, and critical workload types.
- Endpoints
- OS versions
- Applications
- Critical workload types
- 4
Measure impact
Record alert latency, intervention timing, false positives, and performance overhead.
- Alert latency
- Intervention timing
- False positives
- Performance overhead
- 5
Test coexistence
Run with the organization's incumbent EDR/XDR and normal operational controls enabled.
- EDR/XDR enabled
- Operational controls
- Real-world configuration
- Normal business operations
- 6
Review resilience
Confirm the SOC can see the event, understand protection health, and respond with defined workflows.
- SOC visibility
- Protection health
- Defined workflows
- Ready to respond
Request a Ransomware Resilience Assessment
Define the challenge. Measure the outcome. Validate the control in your environment.
Request an assessment info@securitysnares.com
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