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

Static analysis result for SHA-256 3ea000933c44e1c2…

MALICIOUS

Office (OOXML) / .XLSX

600.6 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 7ea874cad90f58d769f35185efe30be8 SHA-1: 9d2fc43bd28c33dcc29a85e79dff85d4ba962f78 SHA-256: 3ea000933c44e1c21cd8926c5e7bec061de4cffdea1c0cf04522f1e286ed2183
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel spreadsheet 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 header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a known vulnerability (CVE-2017-11882). No document body text or scripts were extracted, but the presence of the Equation Editor exploit is sufficient to classify this as a malicious document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WO8Dkq.L2D 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
3f0591b79432f5b3ec491ceb5b5cb2131795511a6cc36b01e30e040b18ca4d7a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WO8Dkq.L2D 818176 bytes
ooxml_oleobject_00_ole10native_00.bin
ef0a79d25e4bc60ae35724cdec1e28c2e054af2fe24dd9336c619b96d2a92f3e		 ole-package OOXML xl/embeddings/WO8Dkq.L2D Ole10Native stream: Ole10NAtiVe 808999 bytes

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