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

Static analysis result for SHA-256 07c25b3a189ac132…

MALICIOUS

Office (OOXML) / .XLSX

9.8 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-26
MD5: d2c54ee5545665b2b26d63419e31ce79 SHA-1: c33b748f24e95fe142ff5248660d4b2b5ce9e715 SHA-256: 07c25b3a189ac13245c109b4d63de2a2eed5570b5a0f831a2a8248bccf849d21
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate an anomaly in the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
a530f5cb1e4c2f56806ea9b5c5e50153e6bced27edf6bee832bdd66528963923		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
5e5525a534823f9317294f627805c6d92fcb5cd477a0734e71919a43657d8181		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtiVE 1503 bytes

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