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

Static analysis result for SHA-256 84d015e704865947…

MALICIOUS

Office (OOXML) / .XLSX

653.2 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-11
MD5: 2b77948e9e35805f8f4d4952248d1958 SHA-1: 53fd9087823fb2dd534541315be27dd079a42a3c SHA-256: 84d015e7048659471f8ca59cda378504caada6249ffba003315bc256b6c18360
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. 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 like CVE-2017-11882. The document body contains financial calculation data, which may serve as a lure or context for a financial scam.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ejmsJ.fglvA 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
465d33f749045ca87a1a36e10f1be1371900cb83332b05709494eaab14c2354e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ejmsJ.fglvA 973312 bytes
ooxml_oleobject_00_ole10native_00.bin
f98657c5db09042ede11b93411b594de9389bb5166b0c53ef44cc12bf0fc8bd3		 ole-package OOXML xl/embeddings/ejmsJ.fglvA Ole10Native stream: oLe10nAtIVe 963301 bytes

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