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

Static analysis result for SHA-256 e443689605b88939…

MALICIOUS

Office (OOXML) / .XLSX

730.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-26
MD5: 255aef6de374c4d17411edd3f35daf6f SHA-1: c47e2a0fdb9017903312b81eb6bbf21281a15cf2 SHA-256: e443689605b88939c8231a374f939a1cbe906c1b776213ee5a2951d86584e5b7
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size difference, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8Ssuer6.6sCjOV2 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a8de5ef2d18f003c1aebf46cc80c9ade13581850f8fce57ea05c124c994d7c30		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8Ssuer6.6sCjOV2 1027584 bytes
ooxml_oleobject_00_ole10native_00.bin
c373e47bd8b1a29e2d19a769c4233a211dc9a3bc744e0a14c156a0da8a4cbdb7		 ole-package OOXML xl/embeddings/8Ssuer6.6sCjOV2 Ole10Native stream: oLe10nAtive 1016834 bytes

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