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

Static analysis result for SHA-256 5eca8a01c785c85d…

MALICIOUS

Office (OOXML) / .XLSX

622.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-09
MD5: d0d7385e1050915b4eef59aa87bfeed3 SHA-1: e940a6ae1c3dc61c2baf9167109b4bb5e66f7111 SHA-256: 5eca8a01c785c85dae69d88d2a679824f90bd0f170340840b30f54a8e6889946
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 Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. The document body content appears to be a purchase order, likely a lure to encourage the user to open and interact with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WwE.CEXOgjU 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
a01cdb58c3f6bec6e7aee451be2d150e8160bcda908fd58d22a36b4675a64658		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WwE.CEXOgjU 860672 bytes
ooxml_oleobject_00_ole10native_00.bin
2f730f2e464d2f79e5c2356798831ba33141e6eeef07a4c71d4de1c655a42059		 ole-package OOXML xl/embeddings/WwE.CEXOgjU Ole10Native stream: Ole10naTIve 851410 bytes

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