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

Static analysis result for SHA-256 b21540f67f521fca…

MALICIOUS

Office (OOXML) / .XLSX

731.9 KB Created: 2023-08-24 03:00:36 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24
MD5: 1bb709ae6f6ea3a48590c2bd1f4e6ef3 SHA-1: 3749edd4cdbddbdb84124a9284c736c12ad6b401 SHA-256: b21540f67f521fca5bf3e6a36eaa6a7d59302c08994842500b24e3cf3d18322e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 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, strongly suggesting exploitation of a known vulnerability. This technique is commonly used to execute arbitrary code or download further malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/YQSTGiYSl.R8sg 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
ff1461af5c01b5326d15375c448765127aa412cd257722b916b1025cbd06a0e0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/YQSTGiYSl.R8sg 1052160 bytes
ooxml_oleobject_00_ole10native_00.bin
3fa64ce37fe8aa15758ab7ed6b1e78f10643db36ccbb17b0d85fc49a007f5154		 ole-package OOXML xl/embeddings/YQSTGiYSl.R8sg Ole10Native stream: olE10NATivE 1041255 bytes

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