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

Static analysis result for SHA-256 b6ef73630806c65a…

MALICIOUS

Office (OOXML) / .XLSX

592.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-26
MD5: fe424ece0f7b342fd752044f85f3e792 SHA-1: 531eee8fc3c84e69fe9d3fb2ea196ff74b78c2cf SHA-256: b6ef73630806c65abf0ae430283ffe47dd528d4b9a56a3bef869b6cc18d2d920
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model: Component Object Model

The sample contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0a.x1m 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
708f5fa8339b1f4237bf3bbd4e86b7f90ba880e8cefe3cfdcbdc798968c51ca6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0a.x1m 827904 bytes
ooxml_oleobject_00_ole10native_00.bin
9b43d4183142eafe419d97341a679c573c718aa4031e302b6d2748bbafe7f966		 ole-package OOXML xl/embeddings/0a.x1m Ole10Native stream: oLE10NATiVE 819172 bytes

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