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

Static analysis result for SHA-256 d492a674cb6d01af…

MALICIOUS

Office (OOXML) / .XLSX

656.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-09
MD5: a2cfbd92ccd84353e8ec52b9f8e0b3f0 SHA-1: 5eef3d3c83707cb33c13d341a124b3a1ed554739 SHA-256: d492a674cb6d01aff720855a53c19ff8abe423e3521bf0ddee8d7c168b468cb6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to deliver a secondary malicious component. The document body itself is formatted as a purchase order, likely serving as a lure to encourage the user to interact with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VySzQB.Sc0gp 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
cfc28ffc41803f193c043fb1ec6bd88b656b79c11fd4b6dc9ae85d9f3811a161		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VySzQB.Sc0gp 904704 bytes
ooxml_oleobject_00_ole10native_00.bin
a7950579369998604cf146fceb29780d7f285be4c10878e8bcb4600ed347a5d1		 ole-package OOXML xl/embeddings/VySzQB.Sc0gp Ole10Native stream: ole10NATivE 895111 bytes

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