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

Static analysis result for SHA-256 6ed303ef72a4bf37…

MALICIOUS

Office (OOXML) / .XLSX

708.1 KB Created: 2014-03-11 22:30:44 UTC Authoring application: Microsoft Excel 12.0000
MD5: 1d7d6f7098b2c88b9958766fd5b847e9 SHA-1: 791ec62a47ac486cdf8b468d2184a928c94a136d SHA-256: 6ed303ef72a4bf375f0cbd33a023392ec0af2a13646b88451aac49c998ad3b59
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to execute arbitrary code, leading to the delivery of a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
8f513ab86bfbe123e09dc059932ea406b10f4409d3d9f0c9fadec22b9ae10ebc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 945152 bytes
ooxml_oleobject_00_ole10native_00.bin
895278ebe9479ff66b40e9d1a54557c704ed97d0d8e58c8f82ff0a282140e089		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 935209 bytes

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