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

Static analysis result for SHA-256 66530f6cad675ea4…

MALICIOUS

Office (OOXML) / .XLSX

665.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-22
MD5: f58c5adb5c0548d33559279702741954 SHA-1: 8f493d4788ff26c3d12ef84837936e4a1bfb681a SHA-256: 66530f6cad675ea4fb4074f70cb3a6d32c51ecd77f991f1f4d528cdd911b3da8
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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, suggesting it's being used to exploit a vulnerability. This pattern is commonly associated with the delivery of malicious content via weaponized Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Hxq7T3o.BbF 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
960bb2ee7f8d91769680d0413d447ea2faf922905f206bfc51043dcf851a4729		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Hxq7T3o.BbF 967680 bytes
ooxml_oleobject_00_ole10native_00.bin
21f28555b5237f43f7253a35f352f1add1d39ad48862f20e5a9d7e423427fcb6		 ole-package OOXML xl/embeddings/Hxq7T3o.BbF Ole10Native stream: oLE10NatiVe 957912 bytes

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