CyberGlossary

Attacks & Threats

Quid Pro Quo Attack

Also known as: Service-for-info scam

Definition

A social-engineering attack in which the attacker offers a service or benefit in exchange for information or access from the victim.

A quid pro quo attack exploits the principle of reciprocity: the attacker promises help, a gift, or a service in return for cooperation. A common pattern is an impostor calling employees, claiming to be from IT support and offering to fix a non-existent issue if the victim discloses their credentials, disables an antivirus, or installs a "diagnostic" tool that is actually malware. Variants include fake survey rewards, free software, or premium content in exchange for login details. Defences include verifying support requests through known channels, restricting administrative actions to a trusted helpdesk identity, security-awareness training and offering employees an easy way to validate unsolicited contacts.

Examples

  • An attacker calls random employees offering to "fix slow Wi-Fi" in exchange for their domain credentials.
  • A pop-up promises a free gift card if the user submits their corporate email and password.

Related terms