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

Static analysis result for SHA-256 42fec03acfada29a…

MALICIOUS

Office (OOXML) / .XLSX

589.0 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: d24773d80958bf06b022364e2b106b72 SHA-1: aae1412bd6b4661fb6757eefe0f25ab2a800d1ae SHA-256: 42fec03acfada29afcb81b7e989f1eee78831fd9ac06b95b4d8aadb819f7c91c
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 Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it is being used to exploit a vulnerability. The presence of an embedded OLE object and the nature of the heuristics strongly indicate a malicious intent to exploit a known vulnerability in the Equation Editor component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zq.xMoL 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
704fe1906b7d3822bcfd17faabe8297170fd9e9792191bc33cc410747ab89139		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zq.xMoL 849408 bytes
ooxml_oleobject_00_ole10native_00.bin
aefb3a247094a9dcf5cfcb33438fad2a2974bdb989b87fc51751174db3c36c35		 ole-package OOXML xl/embeddings/zq.xMoL Ole10Native stream: OLE10nAtiVe 840247 bytes

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