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

Static analysis result for SHA-256 764d6644a25732b5…

MALICIOUS

Office (OOXML) / .XLSX

662.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-04
MD5: 67743470e5695b6664a907285357c4f5 SHA-1: 496cb1235dfe76c3fbf72f9855e171f486dc4a4f SHA-256: 764d6644a25732b56e661d27e172e5fbb68cc2b42ff4ce109c2cc5f8a6fbaf98
100 Risk Score

Malware Insights

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

The file is an Office document containing 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 inner size than the actual stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This points to a likely attack pattern involving the exploitation of CVE-2017-11882 or a similar vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/P2.ZlXJ9r 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
58abd5d62e8fdc1e29a7020f24ffb525471e9c44fa73db679fa81eb3080944a4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/P2.ZlXJ9r 898560 bytes
ooxml_oleobject_00_ole10native_00.bin
0908f58218d9c0b54ef08da3d4de02853d6e2369455577f0b9de362cc3efad8f		 ole-package OOXML xl/embeddings/P2.ZlXJ9r Ole10Native stream: OLE10NaTive 889109 bytes

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