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

Static analysis result for SHA-256 6588c3f067d344a8…

MALICIOUS

Office (OOXML) / .XLSX

584.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-07
MD5: ee986df1c36515232336c3331691de5c SHA-1: e82f9115bf9342a6115998c42f96663487c022ea SHA-256: 6588c3f067d344a83aeaac2f3828f33a70b899fe9dd5129305dc0354cdfb6f55
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The file is an Office Open XML (XLSX) document containing 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 and a significantly larger declared inner size than the actual stream size. This strongly suggests exploitation of a known 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/rX1.waNnKiC 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
6ffa2065bc17417bc7506e934c4d99d94a3e0299100ced3219cfc0321ceafb7c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rX1.waNnKiC 859136 bytes
ooxml_oleobject_00_ole10native_00.bin
7cd6428029b15acae7a8219e3c3db3eb66cbf972870f062fa30c83c87ad4e08c		 ole-package OOXML xl/embeddings/rX1.waNnKiC Ole10Native stream: olE10NAtIve 849645 bytes

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