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

Static analysis result for SHA-256 69e251263be7e552…

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2025-08-18 05:08:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: ef6620d3d101a35c93b789955ea4c47f SHA-1: ed3d2a0625a6ebc1b4b03bd5ec88338102604573 SHA-256: 69e251263be7e552afc9949abb500dcd0567b5c3fb4091383e0e892558e0e309
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object contains an anomalous Ole10Native stream, suggesting it carries a malicious payload. This is a known technique for exploiting vulnerabilities like CVE-2017-11882 to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/G0lhj.Gc 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
38021347345c7e30e9ba3f9b082eb5cd3ac0e785557e2b388a071d734505222c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/G0lhj.Gc 3049472 bytes
ooxml_oleobject_00_ole10native_00.bin
d7171f9d4ffcc241f2e3be26f5f4beb29964704611fe5fca7cf1065014c0f8d9		 ole-package OOXML xl/embeddings/G0lhj.Gc Ole10Native stream: oLe10natIvE 3023146 bytes

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