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

Static analysis result for SHA-256 8be32d79ef965a52…

MALICIOUS

Office (OOXML) / .XLSX

642.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-01
MD5: 3fb2c641f474b96a88c50996e703dccd SHA-1: 6cb8f1cbabc77ca514efa390869812b8ff867dcf SHA-256: 8be32d79ef965a52db139292fae09bed7b51734a1a38d917a99af7d8d282f05e
100 Risk Score

Malware Insights

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

The sample is an Excel file 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, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cH1.nsC 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
73255c7db52cededd5fd3da00ff7afb39809ba39d67d26a5fcc22cf1e01e6663		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cH1.nsC 946176 bytes
ooxml_oleobject_00_ole10native_00.bin
a374b8621450096cf936f87f285768ca3bafe0740ddab131036de8c473866f6e		 ole-package OOXML xl/embeddings/cH1.nsC Ole10Native stream: Ole10nAtiVe 936094 bytes

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