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

Static analysis result for SHA-256 ad6dabfbf9b343f2…

MALICIOUS

Office (OOXML) / .XLSX

642.6 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 66013791a9a70b8b6429a842ee029ccd SHA-1: a8c5aaf7a3f794bda85717f264a65075c80a10a1 SHA-256: ad6dabfbf9b343f2a04f6cdfbc34411b378212dea73d669cab262564420d6ecb
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used to exploit a vulnerability. The presence of this object points to an attack pattern focused on exploiting 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/ZErO3viI9.b4nv 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
1d4851c1ddb6876b07f5e0d776ede212e110bb2b24e0a32992d19177e2a29c59		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZErO3viI9.b4nv 944128 bytes
ooxml_oleobject_00_ole10native_00.bin
4e48c3b928c631b60b65488010e5312fbe9e9f061884b7d4880aeac49484560a		 ole-package OOXML xl/embeddings/ZErO3viI9.b4nv Ole10Native stream: OLE10nAtIve 934176 bytes

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