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

Static analysis result for SHA-256 82d590992a821dad…

MALICIOUS

Office (OOXML) / .XLSX

628.2 KB Created: 2021-04-09 11:12:44 UTC Authoring application: Microsoft Excel 16.0300
MD5: c6d710400d3e06720f56d8e5ea213b03 SHA-1: 755a39d3a809a35a04b7673e7c9dfc3f3406020e SHA-256: 82d590992a821dadee4added2391eb74db73d4f481c015984a15be08ebdbee03
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. The high entropy and anomalous size of the Ole10Native stream within this object strongly indicate it carries a malicious payload. The attack pattern is consistent with exploiting the Equation Editor vulnerability to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KvTiXt6VO.coDVo 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
4b55a744d8146d59f7a9955f9313ec8f6290c1bdc71d5b5c51906d0dcb39ed0f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KvTiXt6VO.coDVo 832512 bytes
ooxml_oleobject_00_ole10native_00.bin
803e54d11ed0beeb7c6b40447451d997b1cc77946cc9d47c1d6e19e70fef483d		 ole-package OOXML xl/embeddings/KvTiXt6VO.coDVo Ole10Native stream: oLE10nAtive 823317 bytes

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