One of the largest botnets ever created is stealing text messages and sending them to Chinese servers, according to an IT security firm.
Researcher at FireEye said they had discovered 64 Android botnet campaigns that belongs to the MisoSMS malware family.
According to FireEye, each of the campaigns used webmail as its command and control infrastructure. This infrastructure comprises of more than 450 unique malicious email accounts.
MisoSMS infects Android systems by deploying a class of malicious Android apps, according to the researchers. The mobile malware masquerades as an Android settings app used for administrative tasks. When executed, it secretly steals the user's personal SMS messages and emails them to a command and control (CnC) infrastructure hosted in China.
"This application exfiltrates the SMS messages in a unique way. Some SMS-stealing malware sends the contents of users' SMS messages by forwarding the messages over SMS to phone numbers under the attacker's control," said FireEye researchers Vinay Pidathala, Hitesh Dharmdasani, Jinjian Zhai and Zheng Bu in a blog post.
"Others send the stolen SMS messages to a CnC server over TCP connections. This malicious app, by contrast, sends the stolen SMS messages to the attacker's email address over an SMTP connection," they added.
The researchers said that MisoSMS is one of the largest mobile botnets that uses modern botnet techniques and infrastructure.
The firm said it was working with Korean law enforcement and the Chinese webmail vendor to mitigate this threat. "This threat highlights the need for greater cross-country and cross-organisational efforts to take down large malicious campaigns," the company said in a statement.
It has also been working with the security community to dismantle the CnC infrastructure used by the malware.
As reported by IT Pro, Android malware has also been discovered calling premium rate numbers.
