Incident Score: Analysis & Impact (BRAASSMIN1781511853)

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 spear-phishing emails containing malicious RAR archives, and malicious RAR archives and Exploit Public-Facing Application (T1190) with high confidence (90%), supported by evidence indicating exploiting a patched WinRAR vulnerability (CVE-2025-8088). Under the Execution tactic, the analysis identified User Execution: Malicious File (T1204.002) with high confidence (90%), supported by evidence indicating when opened with an outdated WinRAR version, the exploit silently drops hidden payloads, Command and Scripting Interpreter: PowerShell (T1059.001) with moderate to high confidence (85%), supported by evidence indicating powerShell loaders are heavily obfuscated to evade detection, and Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001) with high confidence (90%), supported by evidence indicating drops hidden payloads into the Windows Startup folder. Under the Persistence tactic, the analysis identified Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001) with high confidence (90%), supported by evidence indicating payloads into the Windows Startup folder...executes automatically upon next login. Under the Privilege Escalation tactic, the analysis identified Exploitation for Privilege Escalation (T1068) with moderate to high confidence (70%), supported by evidence indicating winRAR vulnerability (CVE-2025-8088) exploited for initial access. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with high confidence (90%), supported by evidence indicating powerShell loaders are heavily obfuscated to evade detection, Indicator Removal: File Deletion (T1070.004) with moderate to high confidence (85%), supported by evidence indicating malware removes staging files and Startup entries after exfiltration, Deobfuscate/Decode Files or Information (T1140) with moderate to high confidence (80%), supported by evidence indicating final payload never writes decoded files to disk, and Hide Artifacts: Hidden Window (T1564.003) with moderate to high confidence (70%), supported by evidence indicating exploit silently drops hidden payloads. Under the Credential Access tactic, the analysis identified Steal Web Session Cookie (T1539) with high confidence (95%), supported by evidence indicating stealing passwords, session cookies, and master decryption keys, Credentials from Password Stores (T1555) with high confidence (95%), supported by evidence indicating extracts data from Chrome, Edge, Opera, and Firefox including passwords, and Unsecured Credentials: Credentials In Files (T1552.001) with moderate to high confidence (80%), supported by evidence indicating scanning for files with 35 extensions (e.g., KeePass databases). Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (95%), supported by evidence indicating scanning for files with 35 extensions (e.g., spreadsheets, email files) and Email Collection: Remote Email Collection (T1114.002) with moderate to high confidence (80%), supported by evidence indicating files with extensions like .eml. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with high confidence (90%), supported by evidence indicating exfiltrated over HTTPS to command-and-control (C&C) servers, Encrypted Channel: Asymmetric Cryptography (T1573.002) with moderate to high confidence (80%), supported by evidence indicating encrypted HTTPS communication, and Ingress Tool Transfer (T1105) with moderate to high confidence (70%), supported by evidence indicating hTML Application (HTA) files hosted on Cloudflare Workers. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (95%), supported by evidence indicating stolen data is encrypted with dual-layer RC4 and exfiltrated over HTTPS and Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) with moderate to high confidence (70%), supported by evidence indicating hTA files hosted on Cloudflare Workers. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.