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

Static analysis result for SHA-256 667b237f578e8d87…

MALICIOUS

Office (OOXML) / .XLSX

743.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14
MD5: fdd5e55670b7ab1917e2cda2b572b956 SHA-1: 07707e3d6d9a8ef260b5e9a5c0eb9a58ea14edab SHA-256: 667b237f578e8d8766d89bfa1114d177d9cb1b96aef9dca0f655bd8e7cd39417
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation. This points to an attack pattern leveraging the Equation Editor vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cU.VmeXLj 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
93d4e5c0effe74b8b3f748a3f0a46275e7d4fe5770b9916ba24894f1adb8f016		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cU.VmeXLj 1067520 bytes
ooxml_oleobject_00_ole10native_00.bin
892706e94fe6c2543b6fe5db53728d416ea0e96f3dfa9d07403811b44005f5d6		 ole-package OOXML xl/embeddings/cU.VmeXLj Ole10Native stream: OLE10NATiVe 1056541 bytes

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