Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fdb7149f084ec253…

MALICIOUS

Office (OOXML)

735.4 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-13
MD5: d8c5715664b7171113f73f7f195284eb SHA-1: bae13e622b880c2488fb5ec41a863d1ae76d1882 SHA-256: fdb7149f084ec253d51509e87a31f860d3cfeb19dcc36e6f9072067e791dccc9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to execute arbitrary code, likely leading to the download and execution of a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ng.dP 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ng.dP 1062912 bytes
SHA-256: 872757c67eafe374f02dcd0b7f09608738f5fdd1a044738d919c88a81b339b97
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/ng.dP Ole10Native stream: oLE10nATive 1052043 bytes
SHA-256: f942806562d24b618454946feed6e0ed2c68bacb193cd86bb416a90adf6793fd

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