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

Static analysis result for SHA-256 59c3bd01f1c454eb…

MALICIOUS

Office (OOXML) / .XLSX

724.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: e4ee30e6786b92f345f607f2527bac31 SHA-1: 95f753c86626b0b21530f05e871151416576749e SHA-256: 59c3bd01f1c454eb59bdd988a0c23b249c1d04bd7314588db8666720cbb67070
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is an Excel 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 size discrepancy, strongly suggesting exploitation of a known vulnerability within Equation Editor for arbitrary code execution. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tAtZ.wbWk 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
e552d11de84161795ecfc18450f87035e20a70a6c52d47a75911f152b7237f9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tAtZ.wbWk 1065984 bytes
ooxml_oleobject_00_ole10native_00.bin
cbdb63e74be27806f89b5547e75d9960152694305509d7dbdcdd1565098dfae5		 ole-package OOXML xl/embeddings/tAtZ.wbWk Ole10Native stream: olE10naTiVe 1055186 bytes

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