CM (Cleanmaster) Security FREE offers two types of antivirus analysis: one for apps and system, and another for SD card content. The first type of analysis is very fast and lasts only a few seconds. Scanning the SD card, however, may take more or less time depending on the amount of data there is to examine.

CM (Cleanmaster) Security FREE's engine is pretty decent. Once the analysis is complete, a report appears summarizing the status of the device. If it detects that an app is infected with malware, the program will display more information about it, such as date of installation, name of the virus, and malicious actions caused by the detected malware.