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

Static analysis result for SHA-256 408adf52ce66d642…

MALICIOUS

Office (OLE) / .XLSX

46.5 KB First seen: 2022-08-15
MD5: c7ead0a0ec53564039b7b57663e7f6e8 SHA-1: 82e8384df2b83e7a4da4761ea519c29410fe0e31 SHA-256: 408adf52ce66d64212c303ec9df03d03c8f354dc6ff5f89b1ba63d94f177b41e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File

The file is an encrypted OOXML document identified as an exploit carrier for CVE-2017-0199. It contains an embedded URL pointing to a remote document, which is likely a second-stage payload. The exploitation of CVE-2017-0199 allows for remote code execution by tricking the user into opening the malicious file.

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://jmcglone.com@107.172.75.169/hp/236.doc

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