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

Static analysis result for SHA-256 408a63fd345ed484…

MALICIOUS

Office (OOXML) / .XLSX

660.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-22
MD5: dec730b27ca90b591389d2ad82dd4844 SHA-1: a80a7b822148b2f5dc6aa85c9f51d609816fffef SHA-256: 408a63fd345ed4843e072cb5bd074934a17d5b69b99ae73290bf0e3d11897556
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is significantly larger than declared, indicating it likely carries a malicious payload. The presence of an embedded Equation Editor object is a strong indicator of exploitation targeting CVE-2017-11882 or similar vulnerabilities.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eMlrv81j.WDE3PZO 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
5bbca3aa8fe7ab3069cdcdefedd681e62bdf238f8f77ba435a87555f3f621744		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eMlrv81j.WDE3PZO 987648 bytes
ooxml_oleobject_00_ole10native_00.bin
177676a2ffe65249d19d9c6c5818ee343ed20b478a40e3ee4c5c19673880f8b3		 ole-package OOXML xl/embeddings/eMlrv81j.WDE3PZO Ole10Native stream: olE10NatIve 977059 bytes

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