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

Static analysis result for SHA-256 9da6954c23239e9d…

MALICIOUS

Office (OOXML) / .XLSX

594.0 KB Created: 2020-01-08 16:45:10 UTC Authoring application: Microsoft Excel 12.0000
MD5: f050e56ab676181725f01ef44c4c9123 SHA-1: 377f8635532ffd7cc3e862576f13cf5f54a2dfea SHA-256: 9da6954c23239e9dca041649d884dea2f7d1bc04414e808a9c32c216c2033e2e
100 Risk Score

Malware Insights

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

The sample is an OOXML 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 within the Equation Editor component. The presence of this embedded malicious object points to a delivery mechanism via a malicious attachment, likely intended to exploit the user's interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Yw3.940s 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
152b1e6938dbbdb0cdd3f840bd8e4d3e7c743a01f700618a311159b71d4f2568		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Yw3.940s 883200 bytes
ooxml_oleobject_00_ole10native_00.bin
666b0966ff241ce61b8cf61d74fcf1ca73f2c8f878ea167867e9c38f91d85748		 ole-package OOXML xl/embeddings/Yw3.940s Ole10Native stream: olE10nAtIVE 873478 bytes

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