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

Static analysis result for SHA-256 3cec52e32216e804…

MALICIOUS

Office (OOXML) / .XLSX

734.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-23
MD5: 1c9a632d64ad963a00ae0af4ccff7d88 SHA-1: 9d531bc3d4a60eae81de7e50d2fa2f37c8efd16f SHA-256: 3cec52e32216e804423f755600d820e50cfde4469d7ee67c80f62d7aa2570870
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting it's being used to deliver a secondary exploit or malware. The embedded OLE object itself is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8c25D.0322xT 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
c9cc159a9fa29b67b24c97d510e41a7c3ce5c66e069496d6224e8a7a0c1a6eae		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8c25D.0322xT 1014272 bytes
ooxml_oleobject_00_ole10native_00.bin
0dd2ca634292ee7ba0b20ab4de7458a62c7ae73e3151bbe89f4b758883805fa9		 ole-package OOXML xl/embeddings/8c25D.0322xT Ole10Native stream: oLE10NaTIVe 1003763 bytes

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