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

Static analysis result for SHA-256 abc1ca283231d983…

MALICIOUS

Office (OOXML) / .XLSX

690.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-02
MD5: 67d13c97623a1bf611722b5df735d9a8 SHA-1: 41fe1797b329de1f7c82e5634ffdb50dfb88c570 SHA-256: abc1ca283231d983a3ff89f162b878576323380579ffef0165bf17cc71f772e9
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this object carries a payload-like stream, suggesting it's used to exploit a vulnerability. The large size and high entropy of the Ole10Native stream further support the presence of malicious code. No scripts were extracted, and the document body appears to be a business-related order form, not directly indicative of the exploit itself.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yCLY.ltSOM0e 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
612191e87c2ca85ee49d39a89e70ff0e0ef54b4d5a648a6badfec5e86b8ad975		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yCLY.ltSOM0e 993792 bytes
ooxml_oleobject_00_ole10native_00.bin
922240aa522829f564b3e733959b19d686421ff714896a77a7ae6b5aaf931f48		 ole-package OOXML xl/embeddings/yCLY.ltSOM0e Ole10Native stream: ole10nativE 983321 bytes

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