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

Static analysis result for SHA-256 731152c5bf2f18db…

MALICIOUS

Office (OOXML) / .XLSX

645.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-09
MD5: e3c746a3da2e47b189613e62d8bffbbe SHA-1: 992097d2b130cdf144860a4c75b9b6b9eb7ffde8 SHA-256: 731152c5bf2f18dbf74c7d36705328154f07a1b540a1b44ca94ecd87b127a013
100 Risk Score

Malware Insights

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

The file is an Excel 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 size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. The embedded object's filename and the stream name are extracted as potential IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/M0n.l35yO7M 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
285f437c52d4d694e377c0fe8b39b4911033996aac2bc4f6d2812490292c9005		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/M0n.l35yO7M 936448 bytes
ooxml_oleobject_00_ole10native_00.bin
52efb9957b4b263c2bd4ab63e828565b948e487377a1523a8f8143dcd084ba84		 ole-package OOXML xl/embeddings/M0n.l35yO7M Ole10Native stream: ole10nAtive 926229 bytes

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