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

Static analysis result for SHA-256 dc7443935ed909e1…

MALICIOUS

Office (OOXML) / .XLSX

624.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 5689ad77747f797c7fce700583f816a4 SHA-1: 0c50fdc9f2e15c8a08c55d4eb4677282e544de4d SHA-256: dc7443935ed909e177df4ee104aa44d63ae47cf482b2d03fe0cff0bc3a1fbfc7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel 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 and a significant size discrepancy, strongly suggesting it's used to exploit a vulnerability. This pattern is commonly associated with the delivery of malicious content via weaponized Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4PcSx.XsX 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
ec2779f336661424456444c489629897c3da09dd450cb5262650b711fc6af8e7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4PcSx.XsX 898560 bytes
ooxml_oleobject_00_ole10native_00.bin
a78eb9a57102a8872c805c6dcfb57aa32cb33e44c3db4d0b36e54986baadff8b		 ole-package OOXML xl/embeddings/4PcSx.XsX Ole10Native stream: oLE10NaTiVE 889342 bytes

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