Incident Score: Analysis & Impact (SURSIGULT1774535812)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Signal Messenger's Cyber Attack and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts Signal Messenger Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the Signal Messenger breach identified under incident ID SURSIGULT1774535812.
The analysis begins with a detailed overview of Signal Messenger's information like the linkedin page: https://www.linkedin.com/company/signal-messenger, the number of followers: 36218, the industry type: Technology, Information and Internet and the number of employees: 109 employees
After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 737 and after the incident was 718 with a difference of -19 which is could be a good indicator of the severity and impact of the incident.
In the next step of the video, we will analyze in more details the incident and the impact it had on Signal Messenger and their customers.
A newly reported cybersecurity incident, "Silver Fox APT Targets Chinese-Speaking Users with Stealthy AtlasCross RAT Campaign", has drawn attention.
A Chinese-nexus advanced persistent threat (APT) group, tracked as Silver Fox (also known as Void Arachne and SwimSnake), is conducting a sophisticated campaign targeting Chinese-speaking users and professionals.
The disruption is felt across the environment, affecting Enterprise networks and Windows systems, and exposing Potential data harvesting via WeChat DLL injection and RDP session hijacking.
Formal response steps have not been shared publicly yet.
The case underscores how Ongoing, teams are taking away lessons such as The campaign demonstrates Silver Fox’s evolution from driver-based process termination to network-level disruption, highlighting the need for enhanced monitoring of in-memory malware and non-standard API resolution techniques, and recommending next steps like Monitor for non-standard processes loading System.Management.Automation.dll, Check for scheduled tasks under \Microsoft\Windows\AppID\ and Block or investigate typosquatted domains (e.g., www-surfshark[.]com, signal-signal[.]com).
Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.
The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Phishing: Spearphishing Link (T1566.002) with high confidence (90%), supported by evidence indicating typosquatted domains impersonating trusted brands like Surfshark, Signal, and Zoom and Drive-by Compromise (T1189) with moderate to high confidence (80%), supported by evidence indicating victims are lured into downloading a ZIP archive containing a triple-nested Setup Factory installer. Under the Execution tactic, the analysis identified User Execution: Malicious File (T1204.002) with high confidence (90%), supported by evidence indicating zIP archive containing a triple-nested Setup Factory installer and Command and Scripting Interpreter: PowerShell (T1059.001) with high confidence (90%), supported by evidence indicating atlasCross RAT integrates a custom PowerShell execution engine (PowerChell). Under the Persistence tactic, the analysis identified Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001) with moderate to high confidence (70%), supported by evidence indicating scheduled tasks under \Microsoft\Windows\AppID\ and Hijack Execution Flow: DLL Side-Loading (T1574.002) with moderate to high confidence (80%), supported by evidence indicating dLL injection into WeChat (Wxfun.dll). Under the Privilege Escalation tactic, the analysis identified Abuse Elevation Control Mechanism: Bypass User Account Control (T1548.002) with moderate confidence (60%), supported by evidence indicating trojanized Autodesk component (Schools.exe) deployed alongside legitimate decoy applications and Process Injection: Dynamic-link Library Injection (T1055.001) with moderate to high confidence (80%), supported by evidence indicating dLL injection into WeChat (Wxfun.dll). Under the Defense Evasion tactic, the analysis identified Subvert Trust Controls: Code Signing (T1553.002) with high confidence (90%), supported by evidence indicating stolen Extended Validation (EV) code-signing certificates issued to DUC FABULOUS CO.,LTD, Obfuscated Files or Information: Embedded Payloads (T1027.009) with high confidence (90%), supported by evidence indicating triple-nested Setup Factory installer, reflective loader for AtlasCross RAT, Process Injection: Dynamic-link Library Injection (T1055.001) with moderate to high confidence (80%), supported by evidence indicating dLL injection into WeChat (Wxfun.dll), Impair Defenses: Disable or Modify Tools (T1562.001) with high confidence (90%), supported by evidence indicating disables AMSI, ETW, Constrained Language Mode, and ScriptBlock logging, and Indicator Removal: File Deletion (T1070.004) with moderate to high confidence (70%), supported by evidence indicating atlasCross RAT loaded entirely in memory using a reflective loader, leaving no disk footprint. Under the Credential Access tactic, the analysis identified Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay (T1557.001) with moderate confidence (50%), supported by evidence indicating rDP session hijacking via tscon.exe and OS Credential Dumping: LSASS Memory (T1003.001) with moderate confidence (60%), supported by evidence indicating potential data harvesting via WeChat DLL injection. Under the Discovery tactic, the analysis identified Process Discovery (T1057) with moderate to high confidence (80%), supported by evidence indicating terminates TCP connections used by Chinese security tools like 360 Total Security and Huorong and System Information Discovery (T1082) with moderate to high confidence (70%), supported by evidence indicating atlasCross RAT likely gathers system information for C2 communications. Under the Lateral Movement tactic, the analysis identified Remote Services: Remote Desktop Protocol (T1021.001) with moderate to high confidence (80%), supported by evidence indicating rDP session hijacking via tscon.exe. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating potential data harvesting via WeChat DLL injection and Screen Capture (T1113) with moderate confidence (60%), supported by evidence indicating atlasCross RAT capabilities may include screen capture. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with moderate to high confidence (70%), supported by evidence indicating retrieves second-stage shellcode payload from C2 server over raw TCP, Encrypted Channel: Symmetric Cryptography (T1573.001) with high confidence (90%), supported by evidence indicating c2 communications use ChaCha20 encryption and hardware-generated random keys, and Ingress Tool Transfer (T1105) with moderate to high confidence (80%), supported by evidence indicating retrieves second-stage shellcode payload from C2 server. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating data breach impacting Chinese-speaking users, potential data harvesting via WeChat. Under the Impact tactic, the analysis identified Endpoint Denial of Service: Application or System Exploitation (T1499.004) with moderate to high confidence (70%), supported by evidence indicating terminates TCP connections used by Chinese security tools like 360 Total Security and Huorong. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Signal Messenger Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/signal-messenger/incident/SURSIGULT1774535812
- Signal Messenger CyberSecurity Rating page: https://www.rankiteo.com/company/signal-messenger
- Signal Messenger Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/sursigult1774535812-signal-surfshark-ultraviewer-cyber-attack-november-2025/
- Signal Messenger CyberSecurity Score History: https://www.rankiteo.com/company/signal-messenger/history
- Signal Messenger CyberSecurity Incident Source: https://cybersecuritynews.com/silver-fox-abuses-stolen-ev-certificates/
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf