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

Static analysis result for SHA-256 025d4f10982d1775…

MALICIOUS

Office (OOXML) / .XLSX

624.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: cf27220ffaa91ef5d84cc118d23a39d3 SHA-1: 0d1551a237820c8c83c36a0dbba421b40f807bed SHA-256: 025d4f10982d17750aecf3b35083836b0e9599b5eccf9ba0f82a1bb818aaa217
100 Risk Score

Malware Insights

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

The file is an OOXML 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 difference, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yG7nizM.vg 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
76dab0aed1b93a74e2d3611b4ee9aece74143073a02769501e846290728272cc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yG7nizM.vg 829440 bytes
ooxml_oleobject_00_ole10native_00.bin
b32da51744e717a3604c9eaca35897325dc03e85b4d88c2fe90be2dae76ded96		 ole-package OOXML xl/embeddings/yG7nizM.vg Ole10Native stream: OLE10nATiVe 820478 bytes

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