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

Static analysis result for SHA-256 017701bd35ed869f…

MALICIOUS

Office (OLE) / .XLSX

1.28 MB
MD5: 2fba2aea6cde2c0ed216396f9a4b9a90 SHA-1: e468d6a9eb558728917bb30ca0eb16e896196014 SHA-256: 017701bd35ed869f05270d7751c0c436008abc9ed68257d3045064d55c8e1fd0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The file is an encrypted Office document that contains embedded OLE objects, specifically identified as an Equation Editor exploit carrier. The presence of an Equation Editor OLE object with a payload-like Ole10Native stream strongly suggests exploitation of a vulnerability within the Equation Editor component to achieve code execution. The document is encrypted, preventing direct analysis of its content, but the structure points to a classic exploit delivery mechanism.

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.
  • 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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Default-encrypted OOXML embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is exploit-shaped Equation/OLE payload evidence.
  • 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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