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

Static analysis result for SHA-256 e66575bcc491dc28…

MALICIOUS

Office (OOXML) / .XLSX

632.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 27d62cceddad6407cfdf3bf1ff577150 SHA-1: 19482d341a687038a267cf5d168492f96e9360b4 SHA-256: e66575bcc491dc28e95d06c7d0ced0f71fc8ff32ed6652b88cd6a7a92cc80939
100 Risk Score

Malware Insights

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

The file is an OOXML document 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, suggesting it's designed to exploit a vulnerability. The presence of an embedded OLE object and the anomaly within the Equation Editor's native stream strongly indicate an exploit delivery mechanism.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/9QL.OAtp7hW 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
654bddd67d95bca2ea50045f0f8960e351a758af6e2d3909d4756cbd526669a9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/9QL.OAtp7hW 857600 bytes
ooxml_oleobject_00_ole10native_00.bin
1477e4b8cc38464a10dd500334fce01103749584f9ec969722b9f6c0c3efc205		 ole-package OOXML xl/embeddings/9QL.OAtp7hW Ole10Native stream: OLE10NAtIvE 847981 bytes

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