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

Static analysis result for SHA-256 48a947249951d0da…

MALICIOUS

Office (OOXML) / .XLSX

743.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24
MD5: e3ae516d2fcbbd994ce1185c037ef937 SHA-1: 09c23664e813b320208ae1ce2ee81298e2937b78 SHA-256: 48a947249951d0daf90df5e6e72c19cbf49d8e97965479459d9397147de021ce
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document 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 and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation. This points to a likely attack pattern involving the exploitation of a vulnerability within the Equation Editor component to execute arbitrary code or deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/BrZe.tK 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
7a8b99dea72333e0ff0ce55b164005864c40d97dd2daefd54993122073f80195		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/BrZe.tK 1017856 bytes
ooxml_oleobject_00_ole10native_00.bin
9e0e0f6694ec5b0d50418981b199ebe9f600e85d297dd31e147cf0c55e6a49cb		 ole-package OOXML xl/embeddings/BrZe.tK Ole10Native stream: Ole10naTive 1007144 bytes

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