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

Static analysis result for SHA-256 546e312963d6dc65…

MALICIOUS

Office (OOXML) / .XLSX

657.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-01
MD5: 56054f220262421f071d4ca269782c61 SHA-1: 537c0387e5efddf3d4144cbcc86363d758bea7e7 SHA-256: 546e312963d6dc654858d939ee2371b81b940eb95dca1dca8cf452b475de8157
100 Risk Score

Malware Insights

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

The sample is an Office 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 an attack pattern leveraging a vulnerability within the Equation Editor 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/xRX.PGkL 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
90982e2ec95cbbdcbda4642acfb11dc4f5415dc5deee2c14966141cae9c39cbf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xRX.PGkL 923648 bytes
ooxml_oleobject_00_ole10native_00.bin
16922d86d3e5f6ba7398e993c85288a789a2fd16d03fdf4148a298b793412b97		 ole-package OOXML xl/embeddings/xRX.PGkL Ole10Native stream: ole10naTive 913634 bytes

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