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

Static analysis result for SHA-256 8c857434bca142d3…

MALICIOUS

Office (OOXML) / .XLSX

715.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-07
MD5: f4f7f68925dbf3c6275191b4c70ef62a SHA-1: 77becd98a814bd40f4b569f9d3912155cba0dc73 SHA-256: 8c857434bca142d39c6ee27bf4c0b21ddc866b8296d2b837c7e859630574fb20
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 and header, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8K.h7aw 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
a794cd325e5a443a39d99375ffc538e2113bb61ea6c5a4c2108028e0f85a6863		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8K.h7aw 1046528 bytes
ooxml_oleobject_00_ole10native_00.bin
53ebe61b8851d68b83ac9f989fd5040c2db8039fea0724d30273607aa8248087		 ole-package OOXML xl/embeddings/8K.h7aw Ole10Native stream: Ole10NATIVE 1036125 bytes

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