COIMBATORE: The Coimbatore district cyber crime police have registered three separate cases following complaints of online financial fraud totalling Rs 7.79 lakh.In the first incident, K Karthikeyan, 27, a private company employee from Karumathampatty in the district, received a fraudulent APK file disguised as an “RTO traffic challan” via WhatsApp. After downloading and installing the application, he entered personal details, including his Aadhaar and mobile numbers. Following this, unauthorised malicious activities were detected on his KVB Bank account. A total of Rs 4.79 lakh was transferred to multiple suspect accounts without his knowledge.In another case, S Sreedevi, 43, a private school teacher at Siruvani near Nallur Vayal in the district, received a call from a fraudster on Sept 24 posing as a representative of HDFC ERGO General Insurance who promised a refund on an insurance policy. Believing the caller, she shared her credit card details, OTP, and a cancelled cheque. Following this, the fraudster transferred Rs 1.75 lakh to three different accounts.C Murugalakshmi, 49, of Valparai received a WhatsApp call from an individual claiming to be a representative of Indian Bank, instructing her to share an OTP for a KYC update. Trusting the caller, Murugalakshmi shared her details and lost Rs 1.24 lakh between Oct 21 and 23.Police began investigations.