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

Static analysis result for SHA-256 9fccbe7844fa0d92…

MALICIOUS

Office (OOXML) / .XLSX

699.4 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 0df04247a510caf5ef08cb8997a2443f SHA-1: 4503238badf4133a63f2837e70ab42870edfc5a7 SHA-256: 9fccbe7844fa0d92de8e745ca672019db23a09777b56128bc4116ed0c7dfeb1a
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. No specific family could be identified, and no further IOCs were extracted.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8mqny7Yn.VERBVm 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
a6af4cb7015930c2d79398221e99823c39c5fc53ba4840c3c92311521042dc1e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8mqny7Yn.VERBVm 1001472 bytes
ooxml_oleobject_00_ole10native_00.bin
5be6057d824d5b029903f1d960cc9b4b7b15c588a43b7d3dce4ca788871e54ea		 ole-package OOXML xl/embeddings/8mqny7Yn.VERBVm Ole10Native stream: OLE10naTIve 990758 bytes

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