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

Static analysis result for SHA-256 072c9d3e6adcee51…

MALICIOUS

Office (OOXML) / .XLSX

626.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-09
MD5: accd406b15bf726024f1e8874f781df5 SHA-1: d64cc1d1e405334755a73b4fd54678f66c19a965 SHA-256: 072c9d3e6adcee51f16d47d6d67427fa264f5dcbd2e480f576105b2bf8d9a32f
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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, suggesting it's being used to deliver malicious content. The embedded OLE object's path and the anomalous stream name are flagged as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5Tjd3o8K.6dwYZg 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
380e1654745d58fee9a241b83e38e1c019248b3500edd4ace634382251aa2491		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5Tjd3o8K.6dwYZg 850432 bytes
ooxml_oleobject_00_ole10native_00.bin
daf15403b573ad5e983145356e7a0d428683ea8cc8464aeaf32dd5b68a8d984e		 ole-package OOXML xl/embeddings/5Tjd3o8K.6dwYZg Ole10Native stream: OLe10nativE 841442 bytes

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