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

Static analysis result for SHA-256 28d58655a78513d1…

MALICIOUS

Office (OOXML) / .XLSX

659.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-10
MD5: 82a847e98a0d3ff35ee049b49e6c048a SHA-1: 7c0cda324feb55176cdf15ddfe3e734c272205ca SHA-256: 28d58655a78513d15503e2fb4b899bb72073969dd71364d9a4e51298a094ad60
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel 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, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FtBlADErN.JU 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
3cce15c642baeecbc42583c20b6b048fd9c51144fe83ce2a379380166cdd835d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FtBlADErN.JU 952832 bytes
ooxml_oleobject_00_ole10native_00.bin
63809951f82a709a5b69ac8ac7f75f707e6eda01b6ecb8b22383c7f3ae881c5d		 ole-package OOXML xl/embeddings/FtBlADErN.JU Ole10Native stream: OLE10natiVE 942654 bytes

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