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

Static analysis result for SHA-256 3d7cb087fa5c8ca4…

MALICIOUS

Office (OOXML) / .XLSX

695.5 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-18
MD5: 4a250f43c626d59e8ad8b2b1edb1b6e1 SHA-1: ec7d6b8d173f41b80546551201a5a2d4c67342d3 SHA-256: 3d7cb087fa5c8ca493ae9b9bc91881fab0cd9cb188663fd8b37103bba776db9b
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits an anomaly where the Ole10Native stream within the Equation Editor object appears to carry a payload, indicated by an unusually large declared size compared to the actual stream size and high entropy. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GqX9TV.jtydpx 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
bbfa49efb5453ed99b0f35d3265a60e8ca2a00205b9efb13ee4e0ef00b17b3e2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GqX9TV.jtydpx 1026560 bytes
ooxml_oleobject_00_ole10native_00.bin
1cead0f68b87d252d8cac98fd96031a5e011337277f0a0ee45ad7303ed9da7d7		 ole-package OOXML xl/embeddings/GqX9TV.jtydpx Ole10Native stream: ole10natIVe 1016274 bytes

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