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

Static analysis result for SHA-256 1719fc1431b36236…

MALICIOUS

Office (OOXML) / .XLSX

639.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-15
MD5: 9056b64f1d8a24fa37d050d8c78ecd6c SHA-1: a388969dad65dfc277bf99fad0814999a88c87e0 SHA-256: 1719fc1431b36236de2ed073c40b306276be99e796d56d642a9d213bdfca2fbc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file 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 size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/EoxHiFLQj.nvjhre 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
7244856051197b30ce0495c51d30b16340300fc2387a2dced9253f49c7819444		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/EoxHiFLQj.nvjhre 952832 bytes
ooxml_oleobject_00_ole10native_00.bin
64fa06f5421de2426709f3429f71d272260271101d9510d470de83157392b8b8		 ole-package OOXML xl/embeddings/EoxHiFLQj.nvjhre Ole10Native stream: oLe10NAtIVE 943094 bytes

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