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

Static analysis result for SHA-256 f8953f3d6bc4eb0c…

MALICIOUS

Office (OOXML) / .XLSX

617.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-15
MD5: 7b04e2cd2edb3b24507812744bf1c5d4 SHA-1: 1877f481c9769c2d25b115f24775cf60641b4b91 SHA-256: f8953f3d6bc4eb0c90cc81a2e649b9c785ee77568d21a47bfab355fa9cac4b35
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. This technique is commonly used to execute arbitrary code or download further malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7wP.a94 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
c06ffd20c62becf074cb61f2d86884447d1e012efc9e0787766444e6d4222fb0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7wP.a94 846336 bytes
ooxml_oleobject_00_ole10native_00.bin
6e35a39ee5215860c0aa5c136ceddd1602cb38387e8bd3bd537f05fd26cd9817		 ole-package OOXML xl/embeddings/7wP.a94 Ole10Native stream: oLE10NaTiVE 837515 bytes

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