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

Static analysis result for SHA-256 712c12bf7e08a677…

MALICIOUS

Office (OOXML) / .XLSX

640.1 KB Created: 2023-09-05 23:31:09 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: 8b004693528071fae34da85e6de2766d SHA-1: 31c5c54b62055ddf9da64b510a1e54d8cafb9685 SHA-256: 712c12bf7e08a677742afd32fed4c20b4eb577d781dd0e9d5baf16d134c1c39b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, identified as an Equation Editor. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's a dropper for a secondary exploit or payload. The presence of this specific OLE object is a common technique for exploiting vulnerabilities like CVE-2017-11882.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/iMpQ5W.tHH 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
c4e1f9fbb387b3238ee0aa9b13ce119ea28b86e619fd4a12a1c41e610c02e625		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/iMpQ5W.tHH 939520 bytes
ooxml_oleobject_00_ole10native_00.bin
98b0d510e7fa3f1fee4076970b0588998c8b50261b399d5af4835acef5412694		 ole-package OOXML xl/embeddings/iMpQ5W.tHH Ole10Native stream: olE10NATIve 929438 bytes

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