A poorly negotiated cloud service contract could result in all the following detrimental effects except:

A poorly negotiated contract might lack exit clauses or data portability guarantees, making it difficult or costly to switch providers, leading to vendor lock-in.

If the contract doesn't explicitly define all required services, service levels, or future needs, the customer might find themselves lacking necessary operational capabilities or support.

A weak negotiation can result in the cloud provider imposing terms and conditions that are disadvantageous to the customer, such as high prices, limited liability, or restricted usage rights.

Malware is malicious software that typically infects systems through vulnerabilities, phishing, or other attack vectors, not as a direct consequence of a poorly negotiated service contract. While a poorly secured service due to contractual gaps could be exploited, the contract itself doesn't introduce malware.