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

Static analysis result for SHA-256 5cd4e6485d048005…

MALICIOUS

Office (OOXML) / .XLSX

606.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25
MD5: 955e0b656cbea87a664b814a680c7039 SHA-1: 6ce5c52c16134086875cfaff92eff909216684a8 SHA-256: 5cd4e6485d048005b1a52079a5b0a10a3cad3c2b928b03c110e45d18025482b1
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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 size, strongly suggesting exploitation of a known vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VyoqVz.y8H 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
e0872cec6c3f8d8da72fd0b9058c3bc27a1b7f0ee53b73c60abf44247c734aad		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VyoqVz.y8H 849408 bytes
ooxml_oleobject_00_ole10native_00.bin
aa72574aaf32dc003b87aff9e5f1667e430dfed46c0096879263b801e43be6f6		 ole-package OOXML xl/embeddings/VyoqVz.y8H Ole10Native stream: OLe10nATIVE 840262 bytes

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