Its APK file is similar to the second stage APK as both have the same evasion techniques and XOR-encrypted DEX files in the APK file’s root folder. It features phone call functionality to redirect calls from the victim’s device to the attacker’s call center. In the third stage, a companion application for the second-stage malware is launched to extend its functionalities. Researchers also noted the use of nanoHTTPD for creating a local HTTP server. An attacker can configure a white list for the phone numbers to be redirected to and a blacklist for numbers that should bypass redirection. This process may leak credentials in the application code.Ĭommunication can be enabled via web sockets, which may cause duplication of commands from the P2P service and web socket. Since such communications are enabled through WEB RTC, the attacker uses relay servers, particularly the publicly available STUN/TURN servers, including Google STUN and self-configured servers. A legit service called ZEGOCLOUD is also abused to facilitate VOIP communication/messaging. The attacker exfiltrates data and enrols the infected device into the P2P VOIP network to make voice/video calls to the victim. The second stage entails a powerful spyware application. In the first stage, the victim visits the attacker’s specially crafted phishing web page, which looks like Google Play Store and is tricked into downloading the malicious application chain. Afterwards, the second stage of malware is downloaded from the control server. Researchers dubbed the first stage the Downloader, in which preparations run on the device, necessary permissions are obtained, and a phishing web page is displayed. What makes it unique is that it is a “ready-to-use framework, which any threat actor could use.” LetsCall Attack Stages LetsCall is targeting users in South Korea, but considering how sophisticated it is, ThreatFabric researchers believe attackers can expand this campaign to European Union countries. In a newly detected muli-stage vishing campaign attackers are using an advanced toolset dubbed LetsCall, featuring strong evasion tactics. Usually, calls from bank employees or salespeople are common, but what if a fraudster makes the call?Īccording to a report from ThreatFabric, published on 7 July 2023, vishing attacks have become much more sophisticated lately. The rise of Vishing (voice or VoIP phishing) has impacted consumers’ trust in unidentified callers. Calling local 411 and/or national directory assistance (1.area, LetsCall is targeting users in South Korea, but considering how sophisticated it is, researchers believe attackers can expand this campaign to European Union countries.Directory Assistance charges may appear on your bill when:.National Directory Assistance refers to a long distance directory assistance call placed to 1-AREA CODE-555-1212, where the area code dialed is not within your local calling area.Local Directory Assistance refers to a call placed to 411.Local Directory Assistance, National Directory Assistance and Call Completion charges vary by location. If the call is answered, you be charged for the call completion service and the directory assistance request. If the number is not answered or busy, you will only be billed for the directory assistance request.Call allowances not used within one billing period cannot be transferred to an additional billing period or to another account.ĭirectory Assistance Call Completion charges are as follows: Individuals with physical or visual disabilities and seniors may also be eligible for call allowances, depending on the state. Depending on your state, you may be eligible to receive a certain number of local directory assistance calls each month at no charge (“call allowances”).
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