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

Static analysis result for SHA-256 8990f6ee1f179a32…

MALICIOUS

Office (OOXML) / .XLSX

651.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-14
MD5: 5918709fbe9a611e2e76d9c42e52dacb SHA-1: 7ad6da1a6b08f51469bb818046d375f58de2c665 SHA-256: 8990f6ee1f179a323288c7064ebdd7962763a812ebf675b7964cd0bcad569596
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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 size and entropy, strongly suggesting it's being used to deliver a secondary exploit or malware. The embedded OLE object and its anomalous native stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/smAj5H.c4dsJgu 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
7e4d44f82d4665fc3b5fe86c9f363d586ae00213598765e60a51fc4a20f44839		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/smAj5H.c4dsJgu 886272 bytes
ooxml_oleobject_00_ole10native_00.bin
da9f26195ad8dab210b4ad6473031bc993eacb460beac9065c1c4e0105708335		 ole-package OOXML xl/embeddings/smAj5H.c4dsJgu Ole10Native stream: ole10natIVe 876954 bytes

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