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

Static analysis result for SHA-256 31a4e8c09dcef76e…

MALICIOUS

Office (OOXML) / .XLSX

658.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-20
MD5: f69c752cf4cb5794506d4bce7f221267 SHA-1: a47997fdb1682470324b82a405c45aa3a63a2a8d SHA-256: 31a4e8c09dcef76e44fb85ef8ec96b36d5b780ff7fc53eeec306b60ad0505692
100 Risk Score

Malware Insights

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

The file is an Office document 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 discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. 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/NNJ8N.xZHRF 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
a64050e5cd66958a46c3f1bfe7a8cea936619e0f5e5dbf9263aed6258ec2839e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NNJ8N.xZHRF 905216 bytes
ooxml_oleobject_00_ole10native_00.bin
e3e969ff122a1f062f691f42f116a236bb9e689dffb879020afa63815b88ff84		 ole-package OOXML xl/embeddings/NNJ8N.xZHRF Ole10Native stream: Ole10natIVe 895789 bytes

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