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

Static analysis result for SHA-256 edf4764357096389…

MALICIOUS

Office (OLE) / .XLSX

1.35 MB
MD5: 4ddcef3dc2b64260444ea0d7eab89ff6 SHA-1: 0c8b18807dc813333c7f3ed420044a5b52798060 SHA-256: edf47643570963890ad63265b1884882a471f000ce9d4a681dd5cdfb8efdc53b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a password-encrypted Excel file that contains an embedded Equation Editor OLE object. This object exhibits anomalies suggesting it carries a malicious payload, likely exploiting a known vulnerability. The presence of the Equation Editor OLE object and the encrypted nature of the document strongly indicate an exploit carrier designed to deliver a secondary stage. The specific vulnerability targeted is likely related to the Equation Editor's handling of OLE objects.

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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