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

Static analysis result for SHA-256 6d8d1fd65107d645…

MALICIOUS

Office (OOXML) / .XLSX

707.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-01
MD5: 43e45bd39f26df0a62fd46e74029ac29 SHA-1: 0c3a104ed323ffa4d07bdab19bb132dc1c10936e SHA-256: 6d8d1fd65107d64556278ebe3f3abc553dcc1c4806bb64ee267973e7155465f4
100 Risk Score

Malware Insights

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

The file contains 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 with an anomalous header and a significantly larger declared size than the actual stream size, strongly suggesting exploitation. The embedded OLE object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3qn.ZR 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
ff7f68e387e6c389fb3f18338173fb4b42b2064d1e0a875dadcb0c44839c9203		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3qn.ZR 959488 bytes
ooxml_oleobject_00_ole10native_00.bin
3ccc89f0f10cb5948ab13d67fc06e015c34f3de6d93fb3084ce64e4c5368a3d3		 ole-package OOXML xl/embeddings/3qn.ZR Ole10Native stream: ole10NatiVE 949325 bytes

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