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

Static analysis result for SHA-256 2f0d53c60cb78229…

MALICIOUS

Office (OOXML) / .XLSX

757.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-30
MD5: 2fbffe2622658c369abb799bf9b8e315 SHA-1: 1b7550fd39e37176bda123210d79425b0f462e53 SHA-256: 2f0d53c60cb7822931ac3f7656afa63081e1bb90b1e2ff07d9bb0d6b8ba02e50
100 Risk Score

Malware Insights

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

The file is an Office document 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 document body appears to be a purchase order, likely a lure to entice the user to open the malicious content. The embedded OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1T.8R 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
ae48cc8991b179266846345b7a22e3b2038093fbc1de959c5126a408eba13a71		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1T.8R 1100800 bytes
ooxml_oleobject_00_ole10native_00.bin
2d0554f06b40f6ec9b7feaec46ff16a6b1a75684ba7e3c96e583443b97693564		 ole-package OOXML xl/embeddings/1T.8R Ole10Native stream: oLe10natIVe 1089612 bytes

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