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

Static analysis result for SHA-256 61b124a40b3052c5…

MALICIOUS

Office (OOXML) / .XLSX

654.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-13
MD5: ccba7f06aa309666e0cd83d0a808a2a7 SHA-1: 229a7e2decb216d410a7b2678028631e81f1f715 SHA-256: 61b124a40b3052c56e3ebfc661cec96d16a1ea769146b2cde90a4338a57a4f83
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, with an anomalous declared size significantly larger than the actual stream size. This strongly suggests the object is being used to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/LEhNm6.GPaPI 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
be9a43d3e9e9e669b0635c7f81f425f243860cd386873ba853e29cde25e2345a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LEhNm6.GPaPI 939008 bytes
ooxml_oleobject_00_ole10native_00.bin
e2454323887e71ac38d772b58fa09dc68fde37387d70da1149769f385a799ddf		 ole-package OOXML xl/embeddings/LEhNm6.GPaPI Ole10Native stream: oLE10nAtIVe 928978 bytes

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