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

Static analysis result for SHA-256 461dfb230569b113…

MALICIOUS

Office (OOXML) / .XLSX

602.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-08
MD5: 453976432b902764ef3cd0d5b400f49e SHA-1: e302d1f60d24c83a8d8a9dcb3ca482b1ce0f0ab4 SHA-256: 461dfb230569b1133e0caf2bd3e0d2e59e08fea9488c509913ab6443a3b61295
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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 size difference, 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/lwr.CNb6n 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
c5e01500add67725993476895f6b5fc4048886fb1e794c6678d6efce22553733		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lwr.CNb6n 846848 bytes
ooxml_oleobject_00_ole10native_00.bin
678d181a129e24eab3a38f6ad0b73ef05acd8be1730d15cc42dbc0a2937b0f4f		 ole-package OOXML xl/embeddings/lwr.CNb6n Ole10Native stream: ole10nATIVE 837746 bytes

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