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210-250 · Question #8

Which evasion method involves performing actions slower than normal to prevent detection?

The correct answer is C. timing attack. A timing attack (low-and-slow attack) is an evasion technique where malicious actions are deliberately slowed down to stay below the detection thresholds of IDS/IPS systems.

Threats and Vulnerabilities

Question

Which evasion method involves performing actions slower than normal to prevent detection?

Options

  • Atraffic fragmentation
  • Btunneling
  • Ctiming attack
  • Dresource exhaustion

How the community answered

(18 responses)
  • A
    6% (1)
  • C
    89% (16)
  • D
    6% (1)

Why each option

A timing attack (low-and-slow attack) is an evasion technique where malicious actions are deliberately slowed down to stay below the detection thresholds of IDS/IPS systems.

Atraffic fragmentation

Traffic fragmentation is an evasion method that splits packets into smaller fragments to bypass deep packet inspection, which is unrelated to slowing down the rate of actions.

Btunneling

Tunneling encapsulates malicious traffic inside legitimate protocols such as DNS or HTTPS to evade detection, not by altering the timing of actions.

Ctiming attackCorrect

Timing attacks, also called low-and-slow attacks, involve spreading malicious activity such as port scans, brute-force attempts, or data exfiltration over an extended period at a reduced rate. By operating below the threshold that signature-based or anomaly-based detection systems use to trigger alerts, the attacker avoids detection. This is distinct from other evasion methods because the core mechanism is manipulation of the rate and timing of actions rather than the structure of the traffic.

Dresource exhaustion

Resource exhaustion involves overwhelming a system's resources such as CPU, memory, or bandwidth, which is typically associated with denial-of-service attacks rather than stealthy evasion.

Concept tested: IDS/IPS evasion using timing and low-and-slow attacks

Source: https://www.cisco.com/c/en/us/td/docs/security/firepower/623/configuration/guide/fpmc-config-guide-v623/intrusion_prevention_and_evasion_techniques.html

Topics

#timing attack#IDS evasion#evasion techniques#slow-rate attack

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