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

Static analysis result for SHA-256 9031419da652ea35…

MALICIOUS

Office (OOXML) / .XLSX

649.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-13
MD5: 7de20d3b9b0d1c4d5baee659391af41f SHA-1: f6bbb1e3ce73bdd0452495c7119c6422a50a09ee SHA-256: 9031419da652ea359a93b540d21a2b2dec0275348c0157ec1a27ced62291c294
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 header, suggesting it's being used to exploit a vulnerability. The presence of this anomalous stream strongly implies the document is designed to execute malicious code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/hIozDW6W.rSW 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
8c1ba49e77d6089da366c26b2a920666755809d0ce02d278dbed590a7efca2c3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/hIozDW6W.rSW 931840 bytes
ooxml_oleobject_00_ole10native_00.bin
8437b8d51beac68241ced1b0a28f4482d224f6fb4d5b5f3c0941e81ee550fb8f		 ole-package OOXML xl/embeddings/hIozDW6W.rSW Ole10Native stream: oLE10NATIve 921749 bytes

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