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

Static analysis result for SHA-256 7d682669a90fce48…

MALICIOUS

Office (OOXML) / .XLSX

698.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4380815c58695ef5cb8f86740c7786cc SHA-1: e51088093a70f94405af9802c284f5bb49bf08b2 SHA-256: 7d682669a90fce48d8cfba7144bb68ba9353b3c5c9d3b6cef1298634bd12de3b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is an Excel document 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 header and a significantly larger declared inner size than the actual stream size. This strongly suggests exploitation of a vulnerability within the Equation Editor component to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZVzOU.GQ0E8RM 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
385c76170fd60d99402270482419815e114e0a26e4ee242c30e03d1c1a5d8666		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZVzOU.GQ0E8RM 992256 bytes
ooxml_oleobject_00_ole10native_00.bin
6d17df0653ce399f80261c9a621fef24688b1b38dbb64e2bb014c29edcc1844c		 ole-package OOXML xl/embeddings/ZVzOU.GQ0E8RM Ole10Native stream: oLE10nATIve 981587 bytes

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