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

Static analysis result for SHA-256 b803051e105410ea…

MALICIOUS

Office (OOXML) / .XLSX

615.7 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: aba95938147b1769800b95da4242619d SHA-1: b71fc65fc1af4aac7d26357235424532be858682 SHA-256: b803051e105410eaa2cae67bc2a63ed82dec091d1ff9bead9ecb13bcacde652d
100 Risk Score

Malware Insights

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

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor component. No document body text or scripts were extracted, but the presence of the anomalous OLE object is sufficient to infer a malicious intent to exploit this vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/JCvGZrr.nFjVP7 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
823792b51b227d439c0991ddde7bddcf98ff0320cea960c2fb86aef48d6852c0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/JCvGZrr.nFjVP7 924160 bytes
ooxml_oleobject_00_ole10native_00.bin
2b10489ef23afb7b0dedaa5fe3e0bb3e6c6c6f5bf687e71064164574ac2299ad		 ole-package OOXML xl/embeddings/JCvGZrr.nFjVP7 Ole10Native stream: olE10NatiVE 914429 bytes

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