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

Static analysis result for SHA-256 0daf18513d6b3549…

MALICIOUS

Office (OOXML) / .XLSX

655.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: ea035f263ee580715c0f7b7428a4d7b6 SHA-1: 53c470a8a33b69dd1d46575fd989d5f6906f8030 SHA-256: 0daf18513d6b35493737ec289f4dcbf015668ef59d7995c0f42dac26d72cfd5a
100 Risk Score

Malware Insights

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

The sample is an XLSX file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting it's being used to deliver a secondary exploit or malware. The embedded OLE object is the primary indicator of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tj0Xna.nb 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
0bf5295561b01d048cfe3763e29ba82738ff7286787203b98079a77918ad9b56		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tj0Xna.nb 872448 bytes
ooxml_oleobject_00_ole10native_00.bin
377002692760acca2c35449ae0939b4ce6bccdf5bb2d030ae06b31a6a23da676		 ole-package OOXML xl/embeddings/tj0Xna.nb Ole10Native stream: oLe10naTIvE 862784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.