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

Static analysis result for SHA-256 80e043b08c7f49d8…

MALICIOUS

Office (OOXML) / .XLSX

594.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-04
MD5: b7b2f2c4b07eac9fbdc862c8dfb79f79 SHA-1: f83e53dd6cdf4524d13bb56f9866886a923c10a7 SHA-256: 80e043b08c7f49d8c6d4da4211018a9f3983ede5df0648169ea2745d10770473
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The presence of an embedded Equation Editor object is a strong indicator of exploitation attempts targeting known vulnerabilities within this component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OTWQh.6ameQr 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
629cab7c68b996d75d34675694dbdd6ce5899dc9053348669ddd6f688c5d81a9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OTWQh.6ameQr 846848 bytes
ooxml_oleobject_00_ole10native_00.bin
38e7a3acbf5d892ae55754b69e69a24c518507330c57621d91c9083b486f5732		 ole-package OOXML xl/embeddings/OTWQh.6ameQr Ole10Native stream: oLe10NATive 837801 bytes

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