Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 a3e30761ad5b9709…

MALICIOUS

Office (OLE) / .XLSX

50.5 KB First seen: 2022-08-20
MD5: d0b6ead71070bf80af5572e6c82bcee9 SHA-1: 224f403abbe095eb6da303d4963dd59de7536d4f SHA-256: a3e30761ad5b97094edca40de43ecebe52cd2990043768138e073fb35286bc98
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1190 Exploit Public-Facing Application

The file is a password-encrypted Office document that exploits CVE-2017-0199. This vulnerability allows the embedded URL, http://trim.cfd/-d/Cz8XG4F3, to be used as a remote loader for a secondary payload. The encryption and exploit carrier shape indicate a deliberate attempt to conceal malicious activity.

Heuristics 5

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE
    Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
  • Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE
    OLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
  • Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML
    OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://trim.cfd/-d/Cz8XG4F3

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