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

Static analysis result for SHA-256 7be80d364613ec31…

MALICIOUS

Office (OOXML) / .XLSX

706.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-05
MD5: 010ac5aa486e123584b06d48acb633d7 SHA-1: 4d16403e148cbd35d815bf3a78da11b4b64249bb SHA-256: 7be80d364613ec31e3d4bed89f849c96ec820187c6f5a524c4869e3012971952
100 Risk Score

Malware Insights

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

The file is an OOXML document 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, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary stage.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/n7nE8nxS.UV8 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
d52bd69298b17e51b18eca063d782f5bbce0afa4338c02083ca8418d74e224ab		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/n7nE8nxS.UV8 1035776 bytes
ooxml_oleobject_00_ole10native_00.bin
5be296b2449bbe28b96c96b35388d2dc3380b84856d24f8eba1a7287add974b5		 ole-package OOXML xl/embeddings/n7nE8nxS.UV8 Ole10Native stream: Ole10NatiVe 1025401 bytes

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