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

Static analysis result for SHA-256 b27cc297a6b4bc3f…

MALICIOUS

Office (OOXML) / .XLSX

679.9 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-18
MD5: 3a81c93011b17e57523c2e5306e25e5f SHA-1: 3e113a4bb652b59ec7049b8218a233163d1d9eec SHA-256: b27cc297a6b4bc3f3374fc9c6b3ee6052bbeda20695a4dd8f12c16e7faaeb3c2
100 Risk Score

Malware Insights

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

The sample is an Excel spreadsheet 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 with an anomalous header, suggesting it's being used to exploit a vulnerability. The document body content appears to be financial or shipping data, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/PZFGoGi.Nz 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
dbaaec199e0849498fc85e020bf3d5dfe39473c8e862eb36819138a9798ae590		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PZFGoGi.Nz 964608 bytes
ooxml_oleobject_00_ole10native_00.bin
876f3212d184b96396af91f8b0ac69f9bb7cbdd64117a1cccba2001f156f80a1		 ole-package OOXML xl/embeddings/PZFGoGi.Nz Ole10Native stream: OlE10nAtivE 954520 bytes

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