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

Static analysis result for SHA-256 b9e61d6b2793b364…

MALICIOUS

Office (OOXML) / .XLSX

607.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-05
MD5: 6252c8df3efb1b31225b3b2cffa5ee51 SHA-1: 0f19818a581debd6b8c364572293318c674cad42 SHA-256: b9e61d6b2793b364620c1e921aef106639484a11de8b23ae2064d51119fc2595
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an 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 designed to exploit a vulnerability. The document body appears to be a fabricated invoice or order form, likely a lure to encourage opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7TN9zv.j1nlS 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
561d9b56555fd65671aac5fad17ab343a02bf7b719972ffc2c703185a8ef7665		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7TN9zv.j1nlS 877056 bytes
ooxml_oleobject_00_ole10native_00.bin
74cf73df104f59a8b0c32cfb0021e8c135306c1d4a6614d5db6fa9edaa950338		 ole-package OOXML xl/embeddings/7TN9zv.j1nlS Ole10Native stream: Ole10nATiVE 867480 bytes

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