For example, Figure 1 shows a phishing message spoofed as Amazon, as observed in Japan. This specification allows an attacker to insert a phishing message spoofed as a legitimate brand sender ID in a legitimate thread. Generally, SMS clients display messages from the same sender on the same thread. SMS spoofing is the act of deceiving recipients by spoofing the sender of a short message, and is a technique used in phishing attacks via SMS. What is SMS Spoofingīefore proceeding, let us remind ourselves of SMS spoofing. Therefore, this article reproduced a message specifying the sender ID using SMPP (Short Message Peer-to-Peer). However, protocols for the transfer of short messages can specify an alphanumeric name as the originating address. Because the TP-OA cannot be loaded in the SMS-SUBMIT, the sender ID cannot be specified in the SMS protocol defined by the 3GPP. By analyzing the spoofed SMS-DELIVER, the alphanumeric characters of the sender ID are found to be included in the TP-OA. The sender ID is submitted to the SMSC by the protocol for the transfer of short messages and is loaded into the TP-OA (TP-Originating-Address) of the SMS-DELIVER. How are the alphanumeric characters of the sender ID transferred? This study reveals the answer to this question by analyzing the spoofed SMS-DELIVER. However, when I reviewed the SMS technical specifications in a previous article, SMS-SUBMIT did not have a field to load the sender ID. Transmission and Detection of Silent SMS in AndroidĪs past articles 1 (in Japanese) and 2 (in Japanese) have indicated, the originating display name (called the “sender ID”) of the SMS can be spoofed. Decision Procedure for Originating Phone Numbers in SMSĪnalysis and Reproduction of Spoofed SMS-DELIVER
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