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

Static analysis result for SHA-256 62627ff53c8fb5e4…

MALICIOUS

Office (OOXML) / .XLSX

694.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-02
MD5: 6b86fd4dc925c22ac9cf134fb525b3d3 SHA-1: 23f2c7c225bd33eeb696910e89981afef4a066a3 SHA-256: 62627ff53c8fb5e46571d1c7899dd0e0ad8bb37225d57a6be2d3a9a882d5fae2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Office 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 size, strongly suggesting exploitation of a vulnerability within the Equation Editor. 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/G0nkdhRo.ne 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
25c65f6013c2983e7d77b95621cf45d5e2a46362bf1c9b5b2ed025b55708aaa0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/G0nkdhRo.ne 1028096 bytes
ooxml_oleobject_00_ole10native_00.bin
5b904a75ab124c9cc39fb8af28e2f91ab466e2451e4bdad313683c5cf06c1a5c		 ole-package OOXML xl/embeddings/G0nkdhRo.ne Ole10Native stream: ole10nATiVE 1017719 bytes

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