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

Static analysis result for SHA-256 b2d3d00d3ecd3da7…

MALICIOUS

Office (OLE) / .XLSX

317.5 KB
MD5: 68b11f590647acfc98506f35ad14c42c SHA-1: 637fe6eb5fdf187a2de3cc3a41a4697584e80ce2 SHA-256: b2d3d00d3ecd3da76faffcb670f7b18cd70e56c0570e365141202c51d40261e8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking

The file is an encrypted Office document, identified as an exploit carrier due to the presence of an Equation Editor OLE object. The heuristics indicate a specific vulnerability, CVE-2018-0798, related to an anomalous Equation Editor native stream within the 'xl/embeddings/oleObject1.bin' file. This suggests the document is designed to exploit this vulnerability upon opening, likely leading to further malicious activity.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Default-encrypted OOXML embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Default-encrypted OOXML contains embedded Equation Editor data with anomalous native stream bytes consistent with a CVE-2018-0798-style exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like.
  • 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-128)).
  • 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.

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