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

Static analysis result for SHA-256 7bde52bc4dcde8bd…

MALICIOUS

Office (OLE) / .XLSX

94.5 KB First seen: 2022-08-06
MD5: 06560fe97bfdc05d5f571099f73d20be SHA-1: 31b09a0be59d7fd2651c1088e4c25d575966eb6f SHA-256: 7bde52bc4dcde8bd10d37ec58e583a1f1e60f9c81294e8701639257d0db0f04e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The critical heuristic firing for CVE-2017-0199 indicates that this OOXML document is designed to exploit a vulnerability in OLE2Link and URL Moniker to load a remote resource. The embedded URL, http://jmcglone.com@l-inky.com/qkCkc, is likely the source of the second-stage payload. The document is password-encrypted, a common tactic to obfuscate malicious content.

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@l-inky.com/qkCkc

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