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

Static analysis result for SHA-256 e9cf1ddb7c2301c6…

MALICIOUS

Office (OOXML) / .XLSX

666.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-04
MD5: 4ae1d7b4316412476c7dd8c3de5aa9db SHA-1: fa6c18f3891221d21c38e4819095ee9d5226a2dd SHA-256: e9cf1ddb7c2301c6001c43358d7a8b1ec1d29563b9898127a205d64d5d8e4eaf
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

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 and size discrepancy, 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/5u.9HlS 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
bfe89d7adcb635d862c103d2456a8d493032b87bbeae81e414f45b0a9139e1a3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5u.9HlS 971776 bytes
ooxml_oleobject_00_ole10native_00.bin
6773a9b0e768b5f9fec21f948fd3e153e5ce1891f42abccee44d7ac013946d07		 ole-package OOXML xl/embeddings/5u.9HlS Ole10Native stream: OlE10nATIvE 961721 bytes

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