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

Static analysis result for SHA-256 f5cba593e33f1730…

MALICIOUS

Office (OOXML) / .XLSX

724.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-04
MD5: fc67413bb0296c9173075a4a6b4abf3e SHA-1: 5e758525248fb3b234a364d91836164e74da6e1c SHA-256: f5cba593e33f1730a6439cd898f83eadc2aec631d6ad39fc9b6d71c6482f7c34
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an Excel file 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 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/MPc7.x0 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
fbd45aa74220f2266f9cfeadb622af8321441ad589d3ecc27af3f68170be7cf4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MPc7.x0 994816 bytes
ooxml_oleobject_00_ole10native_00.bin
901eeff91b56d612b42cd9e60911b08f51f80d9e3cb706b6247e7078ab128a3d		 ole-package OOXML xl/embeddings/MPc7.x0 Ole10Native stream: olE10natiVE 984417 bytes

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