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

Static analysis result for SHA-256 6f198129321e2964…

MALICIOUS

Office (OOXML) / .XLSX

2.87 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 416176ae9a2bc7e8470ba9d0048d2213 SHA-1: 76345bf787a416e5ae14bba944e67c6d42c943b9 SHA-256: 6f198129321e296427f3d60f96c50273f02508c128d9547a383cf8148c5bd35c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and header, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NLhICOBEc.OyQQ 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
68fcb7a583a64cf79fcd3ba1fdfa23fbe4bf7368d0a993a5444daaac851d618f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NLhICOBEc.OyQQ 2973184 bytes
ooxml_oleobject_00_ole10native_00.bin
f787ac410c0f6b311202f4674299c3633c01996343f407ce984aa2c53f705da4		 ole-package OOXML xl/embeddings/NLhICOBEc.OyQQ Ole10Native stream: OLe10NaTIVe 2947510 bytes

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