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

Static analysis result for SHA-256 49f684c1b8f2272e…

MALICIOUS

Office (OOXML) / .XLSX

648.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-20
MD5: 0bee3cec9b87bc97d5ada837c07d66f9 SHA-1: b102b751dacc9530ce2c70cf37f91eaf46f2eb00 SHA-256: 49f684c1b8f2272ec09aa087937ae78e185dd05584b8b02f8515caa613f19ce9
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 Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size mismatch, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/JnTFubU7p.puG3yW 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
c10a85dacd4422ef416a7f6b437e7315e0ac12ec47e1b39d88299d2d2e14c7e3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/JnTFubU7p.puG3yW 939520 bytes
ooxml_oleobject_00_ole10native_00.bin
66578bc069fa0683589be9a6114a4ea1fbfef685440e7be91078d11851069f58		 ole-package OOXML xl/embeddings/JnTFubU7p.puG3yW Ole10Native stream: OlE10nAtIVE 929710 bytes

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