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

Static analysis result for SHA-256 cac1d561febe62fe…

MALICIOUS

Office (OOXML) / .XLSX

653.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-20
MD5: a1aa2e7cf472ee893d5d0f6f9fab8381 SHA-1: c7db1645fe74042e5720feef5e6f0c8795c3491b SHA-256: cac1d561febe62fedc6df0233e5ea563bc05812779214ec71b56920ca2473cd0
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 size mismatch, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This technique is commonly used to deliver secondary malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/J8IaFuP5.mv 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
6390b22d1aa778305c419ad90f70ad8d113a3cfbc30b22e0323e30a86d7f48d4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/J8IaFuP5.mv 956928 bytes
ooxml_oleobject_00_ole10native_00.bin
219a7a08ad5f17c30d9e56cbb2c87d55759243f5944bdedbae35ac2d513d32ed		 ole-package OOXML xl/embeddings/J8IaFuP5.mv Ole10Native stream: Ole10naTIVE 946767 bytes

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