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

Static analysis result for SHA-256 946529e70120618e…

MALICIOUS

Office (OOXML) / .XLSX

678.4 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-23
MD5: 35b018ab0d76f96b39499a350be47b16 SHA-1: 948b75225afb9ac5da874cb5307b934dc3581486 SHA-256: 946529e70120618e2e71d8d275566dc5b5474ef1004be6267d83b8d73b7f22d5
100 Risk Score

Malware Insights

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

The XLSX file contains 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 header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malicious documents, often used to download and execute further stages of malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/EzWF.FxV 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
ccfdd6f1e7e52adda57f25ab9ca15cfc73f0ab3e6cadc6267e24daa11e385195		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/EzWF.FxV 883200 bytes
ooxml_oleobject_00_ole10native_00.bin
3e6882b6fb52c327d57f10ef245f7a588e906b3251ffebd5be7b45c690c14d36		 ole-package OOXML xl/embeddings/EzWF.FxV Ole10Native stream: OLE10nATIVE 873652 bytes

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