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

Static analysis result for SHA-256 84aab9f68b1051f6…

MALICIOUS

Office (OOXML) / .XLSX

701.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-22
MD5: 5bc571b4e9a2374dc90f9d7ddd4c5774 SHA-1: 64874c9bf60dc696596c38dbf5ff26812838871e SHA-256: 84aab9f68b1051f694f2c83ba4dee20be94a30a86cf75508b6cbed76363c0493
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size mismatch, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/O8nM.6I44m 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
cd6dfb1cbbbcbbf302fd4dc28b0ca7297b51e43a28c02ac7f9d7e13f0a5798a1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/O8nM.6I44m 951296 bytes
ooxml_oleobject_00_ole10native_00.bin
9bf70c4be677fbb68df190ded0c60ad5a6d49858a021cde00d4744ca3785a214		 ole-package OOXML xl/embeddings/O8nM.6I44m Ole10Native stream: OLE10natIVE 941484 bytes

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