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.

Request a resilience assessment See how Mythos adapted
Attempts stopped
183 / 183
Successful bypasses
0
Lab hosts
5
Engagement time
23h 47m

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
AES-CTR, throttling, entropy masking, 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. 1

    AES-CTR

    Mythos strategy

    In-place, stream-like encryption behavior.

    Security question

    Does prevention depend on a known ransomware cipher?

  2. 2

    Throttling

    Mythos strategy

    Reduced or intermittent file-write cadence.

    Security question

    Can slowing the attack avoid behavioral thresholds?

  3. 3

    Entropy masking

    Mythos strategy

    Encoded or altered ciphertext appearance.

    Security question

    Can encrypted output be made to look less suspicious?

  4. 4

    Process posture

    Mythos strategy

    Benign-process context.

    Security question

    Can trusted-looking execution slip past prevention?

  5. 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

  1. 25 Recon + baseline Environment discovery and baseline behavior established
  2. 58 Stealth tests Evasion techniques tested in isolation and variation
  3. 100 Full engagement Combined techniques and extended execution
  4. 183 Total executed Scenarios run across five hosts
  5. 183 Stopped Encryption attempt stopped by RansomSnare
  6. 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

1

Prevent

Reduce initial compromise

  • Email
  • Firewall
  • MFA
  • Vulnerability management
2

Detect

Find malicious activity

  • EDR
  • XDR
  • SIEM
  • MDR
3

Endpoint resilience

Keep encryption visible

  • RansomSnare
  • Works alongside EDR/XDR
  • Offline capable
4

Recover

Restore operations

  • Immutable backup
  • DR
  • Business continuity

Business operations · People · Processes · Applications · Data · Services

Six questions every CISO should ask

  1. Does my organization's ransomware protection depend on known ransomware variants?
  2. What happens when encryption is slowed, partial, or structurally altered?
  3. How many files are affected before intervention occurs?
  4. What happens if attackers attempt to disable the endpoint control first?
  5. How much downtime will we incur restoring from backups, if backups are still available?
  6. 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. 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. 2

    Vary behavior

    Test AES-CTR, throttling, alternative process context, and controlled encryption variations.

    • AES-CTR
    • Throttling
    • Alternative process context
    • Encryption variations
  3. 3

    Verify coverage

    Validate across representative endpoints, OS versions, applications, and critical workload types.

    • Endpoints
    • OS versions
    • Applications
    • Critical workload types
  4. 4

    Measure impact

    Record alert latency, intervention timing, false positives, and performance overhead.

    • Alert latency
    • Intervention timing
    • False positives
    • Performance overhead
  5. 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. 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

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