SMS SPAM AND FRAUD PREVENTION

Transcription

1 WHITE PAPER SMS SPAM AND FRAUD PREVENTION Short Message Service (SMS) messages account for approximately 10 percent of a mobile operator s revenue, according to research firm IDC. The growing volume of spam can threaten this revenue by provoking subscribers to churn. Furthermore, some of that spam is sent from fraudulent addresses, causing inaccurate billing for subscribers and revenue forfeiture for the mobile operator, which cannot bill the sender for the termination fee. To prevent subscriber churn and protect revenues, mobile operators need a flexible solution for identifying and dropping unwanted SMS messages. THE CISCO SMS SPAM AND FRAUD PREVENTION SOLUTION IMPROVES SUBSCRIBER SATISFACTION, HELPS PREVENT FRAUDULENT BILLING, AND PROTECTS THE MOBILE SERVICE PROVIDER S SIGNALING NETWORK FROM FLOODING. EXECUTIVE SUMMARY SMS has become the next frontier for direct marketers, drawn to a potential market of 1.5 billion mobile services subscribers. In Europe, 18 percent of marketing and advertising agencies offer SMS-based marketing (Empower Interactive, May 2004). Forrester Research estimates that 140 million European subscribers received SMS ads in 2004 and that 62 percent of European direct marketers will include SMS in their marketing campaigns (Forrester, March 2004). Mobile operator networks are experiencing the impact: mobile marketing messages represent approximately 10 percent of network traffic other than point-to-point traffic (Empower Interactive, May 2004). Controlling SMS spam is important to mobile operators for two reasons. One is that spam irritates subscribers, contributing to churn. Giga Research reports that 60 percent of spam recipients found spam annoying, and 28 percent regarded it as an unacceptable invasion of privacy. During the first six months of 2003 in the United Kingdom alone, the Independent Committee for the Supervision of Standards of Telephone Information Services (ICSTIS) managed 3500 SMS-related spam complaints (Giga Research, 2003). The other reason for controlling spam is to avoid revenue forfeiture. In fraudulent SMS schemes, the sender emulates the identity of another subscriber or that of a valid SMS center, which relays and manages short messages. When this occurs the mobile operator receives no termination fee for sending the message. If the sender spoofs a subscriber address, resulting in unwarranted charges on the subscriber s monthly bill, subscriber satisfaction plummets. Furthermore, high volumes of fraudulent SMS can degrade the performance of the signaling network, and in extreme cases bring it down. Cisco Systems offers a proven solution to these problems, called the Cisco SMS Spam and Fraud Prevention solution. Mobile operators deploy it on their signaling network, where it intercepts SMS messages, applies filters to identify spam, and drops offending messages. Uniquely, the solution can identify likely spam messages as they are being sent, based on repetitive content and volume, and can temporarily apply rules to block this traffic until a human operator can intervene. The Cisco SMS Spam and Fraud Prevention solution is part of Cisco IP Transfer Point, a solution for transporting Signaling System 7 (SS7) traffic over IP networks. As the leading next-generation signaling platform, the Cisco IP Transfer Point allows service providers to efficiently transport SS7 traffic by offloading the traffic from the traditional Signaling Transfer Point (STP) network to an SS7 over IP network. The Cisco IP Transfer Point also positions the mobile operator for enhanced return on investment (ROI) and profits by providing the infrastructure for IP-enabled service control points (SCPs) and revenue-generating IP services. Entry-level through high-end platforms are available. The Cisco IP Transfer Point provides enhanced scalability to the network, reduces operating costs, facilitates IP-based application access to SS7 networks, and in many cases adds more sophisticated network management and control than available with traditional SS7 networks. All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 1 of 6

2 This paper describes the rising threat of spam for mobile operator networks, how the Cisco SMS Spam and Fraud Prevention solution works, and its business benefits. BUSINESS RISK OF SMS SPAM AND FRAUD Types of Spam and Fraudulent SMS Some bulk SMS messages are sent by legitimate subscribers. The SMS spam originates in the local mobile operator network and the sender pays the mobile operator a termination fee, generally under a bulk contract. Most senders of this type of spam are other mobile operators, with retailers trailing far behind in second place, followed by financial firms and manufacturers (Giga Research). The risk of this legitimate spam is subscriber annoyance, which contributes to subscriber churn. Mobile operators can increase subscriber satisfaction and reduce churn by offering granular SMS spam-prevention services. Other types of SMS messages are fraudulent, sent by individuals who assume a false identity to avoid paying a termination fee. Most of these schemes are similar: The subscriber receives a message to call or send a text message to a premium-rate number for example, to find out if he or she has won a prize (Figure 1). Children are often specifically targeted. These attacks not only annoy subscribers, they cause revenue forfeiture for the mobile operator, which cannot bill for message termination. Worse, huge volumes of SMS messages in a short period of time can take down the signaling network, causing the bearer network to refuse calls and connections. Table 1 summarizes the risks of SMSbased attacks to mobile operators. Figure 1 Typical SMS Spam Scheme All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 2 of 6

3 Table 1. Types of Fraudulent SMS-Based Schemes and Their Risks Type of Attack Source Risk to Mobile Operator Spamming Flooding Faking Spoofing Content provider that has a regular service agreement with the home operator Content provider connected to a foreign network s SMS-Center Hacker engine that simulates regular SMS-Center behavior Pirate engine that simulates mobile devices in a roaming situation Home operator can be accused of spam relay by subscribers or by other operators with which the home operator has a roaming agreement Home operator incurs relay operator costs and cannot collect termination fees Home operator cannot collect termination fees Subscriber whose Mobile Subscriber ISDN (MSISDN) identity is assumed will be unduly charged, leading to serious billing issues Service Opportunity Business incentives for deploying an SMS spam and fraud prevention solution include: Shielding subscribers from an annoyance that might cause churn Protecting young or gullible subscribers from expensive and fraudulent offers Protecting the network from the effects of spam-generating viruses, which can include widespread billing errors that annoy subscribers and require many personnel hours to correct Preventing volume spikes that can degrade signaling-network performance and possibly render the bearer network useless To achieve these goals, mobile operators need a flexible solution that can stop unwanted SMS messages and accept legitimate SMS messages. The solution needs the intelligence to recognize potential spam in real time and temporarily stop it until the operations staff can confirm that the messages are, indeed, unwanted spam. CISCO SMS SPAM AND FRAUD PREVENTION SOLUTION Real-Time Screening Cisco offers a next-generation signaling solution that allows mobile operators to shield their subscriber base and internal operations from SMSbased spamming and other fraudulent activity. The Cisco SMS Spam and Fraud Prevention solution, which resides on the mobile operator s signaling network, screens SMS messages in real time. It includes two primary components: the Cisco IP Transfer Point and the Ferma SMS Anti-Spam Screening (SAS) platform from Ferma, a member of the Cisco Service Provider Solutions Ecosystem Program. The solution works as follows: 1. The Cisco IP Transfer Point intercepts SMS traffic and routes it to the Ferma SAS platform. Traffic other than SMS is passed along without interference (Figure 2). 2. The Ferma SAS platform filters the message to see if it matches the mobile operator s white lists or black lists, which are based on the sender s SMS-Center address, keywords, or other parameters. 3. Messages that do not match the black-list filters or that match the white-list filters are passed through to the destination. 4. Messages that match the black-list filters are stopped and not delivered to the destination mobile device. The message sender can receive either a positive or negative acknowledgement, depending on how transparent the mobile operator wants its service to be, because sending a negative acknowledgement alerts the sender that the mobile operator has identified the message as spam. All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 3 of 6

4 Figure 2 Intercepting and Filtering SMS Messages Filtering Rules The mobile operator uses a Web-based interface to define filtering rules that can include: White lists of allowed senders. Black lists of blocked senders. SMS-Center address. Time-limited rules that apply for a specified period, such as: All messages coming from a specific SMS-Center will be accepted until the end of March Quota-based rules, such as: Only 250,000 SMS messages will be accepted from a particular SMS-Center, and the remaining will be blocked. This type of rule is useful for enforcing SMS termination policies between operators or with content aggregators. Originating address. Content analysis such as keyword search. Heuristic analysis, or looking for repetitive occurrences within a period of time, based on SMS headers and contents. Heuristic Analysis, or Self-Learning Unlike other signaling solutions, the Cisco SSFP solution can identify potential spam in real time, even if the message does not match predefined filters. To accomplish real-time spam detection, the Ferma SAS platform analyzes messages flows to detect repetitive content sent during a timeframe that the mobile operator specifies. When this occurs, the platform sends an alarm to the operations department, for human intervention, and can apply a temporary filter while the operator decides how to respond. The alert contains the SMS-Center originating source as well as the content of the suspect message. Service Benefits to Mobile Operators By deploying the Cisco SMS Spam and Fraud Prevention solution, mobile operators: Increase subscriber satisfaction and loyalty Secure Home Location and Visitor Registers (HLR/VLR) Reduce traffic on the Radio Access Network (RAN) Help ensure compliance with government laws and regulatory commission requirements Differentiate their SMS service to attract roamers All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 4 of 6

5 WHY CISCO The Cisco SMS Spam and Fraud Prevention solution offers unique advantages not available from other spam-filtering solutions. Economics That Support High-Volume Messaging Applications A typical Cisco ITP deployment costs less than half of traditional, time-division multiplexing (TDM)-based signaling transfer point (STP) solutions, and generates ongoing cost savings of 75 to 80 percent because of the cost advantages of IP, which include lower capital expense and faster introduction of new applications and services. Operational expense drops, as well, because the mobile operator can eliminate leased lines and reduce software maintenance and upgrade costs. This dramatic shift in economics enables more bursty messaging applications, such as event televoting, a new source of revenue used for the Big Brother telecast in the United Kingdom and American Idol in the United States. These events require infrastructure that reliably and cost-effectively manage the sudden and high burst of traffic created by the participation of nearly 10 percent of an operator s subscriber base. The Cisco ITP meets these requirements, accelerating return on investment (ROI) from years to months. High Availability for SMS The high capacity of the Cisco ITP helps ensure availability for general SMS, which provides the highest revenue-per-bit of any service in the mobile operator s portfolio. Providing reliable service to subscribers strengthens subscriber loyalty and helps mitigate churn. Proven Performance In use by more than 50 mobile operators worldwide, the Cisco ITP commands more than 35 percent market share for SS7-over-IP signaling. Mobile operators can be confident about deploying a solution that builds on the Cisco core competency in high-performance, highly available IP routing as well as its expertise in building large-scale, carrier-class, packet networks. Comprehensive Programs Through Cisco Advanced Services, mobile operators gain access to certified experts in-depth technical knowledge, specialized tools and methodologies, industry-leading research labs, and a network of certified partners to help ensure the delivery of high-quality mobile wireless services. Cisco consultants and engineers help minimize the risk to valuable business assets by working with the mobile operator to plan, design, implement, operate, and optimize mobile wireless networking solutions. Contact your Cisco representative to find out more about how Cisco Advanced Services experts can help improve staff productivity, and help reduce the total cost of ownership for your network. CONCLUSION As SMS continues to grow in popularity, the need for an effective SMS spam and fraud prevention solution is escalating. With its flexible rules and self-learning capabilities, the Cisco SMS Spam and Fraud Prevention solution puts the mobile operator and, ultimately, the subscriber in control of which SMS messages to allow or drop. For more information on SMS spam and fraud prevention, visit: For more information on the Cisco IP Transfer Point, visit: All contents are Copyright All rights reserved. Important Notices and Privacy Statement. Page 5 of 6

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