Incident Score: Analysis & Impact (INDPRO1787991896)

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 Attachment (T1566.001) with high confidence (95%), with evidence including tax-themed ZIP/IMG attachments in phishing emails, and victims tricked into opening ZIP archives (e.g., Tax_Notice_23665.zip) and Phishing: Spearphishing Link (T1566.002) with moderate to high confidence (80%), with evidence including gov12366.com mimicking government tax service, and emails directed victims to download ZIP archive. Under the Execution tactic, the analysis identified User Execution: Malicious File (T1204.002) with high confidence (90%), with evidence including victims executed 资料数据.exe from ZIP archive, and iMG disk-image files executed via DLL sideloading and Command and Scripting Interpreter: Windows Command Shell (T1059.003) with moderate to high confidence (85%), with evidence including packClient RAT supports shell command execution, and rundll32.exe executed DLLs from temp directories. Under the Persistence tactic, the analysis identified Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001) with high confidence (90%), with evidence including persistence via RunOnce registry entry to survive reboots, and %TEMP%\svchost.exe launched via registry. Under the Privilege Escalation tactic, the analysis identified Process Injection (T1055) with moderate to high confidence (70%), with evidence including dLL sideloading via rundll32.exe, and donut Loader deployed via IMG files. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate to high confidence (85%), with evidence including encrypted payload decrypted as %TEMP%\svchost.exe, and packClient RAT uses payload encryption, Signed Binary Proxy Execution: Rundll32 (T1218.011) with high confidence (90%), with evidence including rundll32.exe loaded DLLs from temp directories, and used to execute xMain.dll, and Masquerading: Match Legitimate Name or Location (T1036.005) with moderate to high confidence (80%), with evidence including svchost.exe --guard argument to restart RAT, and malware saved as %TEMP%\svchost.exe. Under the Credential Access tactic, the analysis identified Input Capture: Keylogging (T1056.001) with high confidence (90%), with evidence including packClient RAT supports keylogging, and keylogging data listed as compromised and Credentials from Password Stores: Credentials from Web Browsers (T1555.003) with moderate to high confidence (85%), with evidence including browser data theft capability in PackClient RAT, and browser data listed as compromised. Under the Discovery tactic, the analysis identified Process Discovery (T1057) with moderate to high confidence (80%), with evidence including packClient RAT supports process enumeration, and file management and process discovery commands and Query Registry (T1012) with moderate to high confidence (75%), with evidence including packClient stores settings in HKCU\SOFTWARE\PackClientConsole\, and registry modification capabilities. Under the Collection tactic, the analysis identified Screen Capture (T1113) with high confidence (90%), with evidence including packClient RAT supports screenshot capture, and screenshots listed as compromised data, Audio Capture (T1123) with moderate to high confidence (80%), with evidence including packClient RAT supports webcam capture, and webcam data listed as compromised, and Data from Local System (T1005) with high confidence (90%), with evidence including file management and data collection capabilities, and clipboard manipulation and browser data theft. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with moderate to high confidence (85%), with evidence including c2 traffic to 64.81.30.99 and 192.252.180.45 such as 6666, and outbound TCP traffic on port 6666 and Ingress Tool Transfer (T1105) with moderate to high confidence (80%), with evidence including downloadable plugins for extended functionality, and second-stage loader (PackClientLauncher). Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), with evidence including data exfiltration listed as motivation, and c2 traffic to known malicious IPs. Under the Lateral Movement tactic, the analysis identified Remote Services: Remote Desktop Protocol (T1021.001) with moderate to high confidence (75%), with evidence including installation of ManageEngine Remote Monitoring and Management software, and lateral movement observed post-infection. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.