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

Static analysis result for SHA-256 f6912462594d0ef4…

MALICIOUS

Office (OOXML) / .XLSX

609.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 53f0f0e9f72a87bf71fb46ea39a2c220 SHA-1: 5ce8ab5f83aeb93dd74b6520eabdbff0bf9f57ab SHA-256: f6912462594d0ef4431d7289ea2840a2a674e2895978b4217b2bd520803848d0
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 size and entropy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GZQyeZEM.CN29 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
77d38d66d0cc2d7bee2bb0acfef07328445b4fbf5de8a51004e3ddddc5e2a8f3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GZQyeZEM.CN29 861184 bytes
ooxml_oleobject_00_ole10native_00.bin
c5aefc7a363ee1a2d14da995b3399c4745279952da77af04add768b8c87b2f8f		 ole-package OOXML xl/embeddings/GZQyeZEM.CN29 Ole10Native stream: OLe10nATIVE 851531 bytes

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