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

Static analysis result for SHA-256 0bcd0ac48b5ffde0…

MALICIOUS

Office (OOXML) / .XLSX

690.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-07
MD5: 1cece9fd49abd3e71652d7f93247273c SHA-1: eb999f406d4762bf6b7305520567e45eeedae78a SHA-256: 0bcd0ac48b5ffde03aa805676fb9f378b257b84fce03b8e724903a0ed5309a07
100 Risk Score

Malware Insights

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

The sample is an Office Open XML 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 exploit a vulnerability. The embedded OLE object and the nature of the payload point towards a malicious document designed to execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OVn.t6 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
fbcf3f45ea8c8e487f7409b8078b143c501d6a79093b4420ecc21dfbcfe93ee6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OVn.t6 983552 bytes
ooxml_oleobject_00_ole10native_00.bin
cca2f651de903a736ef3db197e72b277cbe75f3ac455ac5c1aaf41cc6d983179		 ole-package OOXML xl/embeddings/OVn.t6 Ole10Native stream: oLE10nATIvE 973634 bytes

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