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

Static analysis result for SHA-256 40cae6f674720f86…

MALICIOUS

Office (OOXML) / .XLSX

648.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-12
MD5: c12556a8b65fa2afa5d5bd2d026752a0 SHA-1: 3a5213f512b17f2a32723dfdfbc332dba82faff8 SHA-256: 40cae6f674720f861d565ed2a517703fd3326715ae0540ab3cb5d57aa274b207
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 designed to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary stage.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/AMiRr1.NrqzyjW 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
ca53b81d462704b9ab9e14ae41acc3481b5efda78920f5a1cd40c3bb94ad882b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/AMiRr1.NrqzyjW 862208 bytes
ooxml_oleobject_00_ole10native_00.bin
27e718fec2c51bdabaaf595bdfc85d11b826c73a2792fa4827707fd90c8acb1d		 ole-package OOXML xl/embeddings/AMiRr1.NrqzyjW Ole10Native stream: oLE10naTiVE 852952 bytes

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