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

Static analysis result for SHA-256 3d6a764f354cc7ec…

MALICIOUS

Office (OOXML) / .XLSX

1.04 MB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-07
MD5: d3d03e9318b920272032139d3e2a2d6b SHA-1: f29be2988cc44e6afa2144b64891470cbeb89ef8 SHA-256: 3d6a764f354cc7ec89ee9611efb92f84dc83b99678953802fcaf90d74dc6700b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample is an Excel file 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, suggesting it's being used to deliver a secondary exploit or payload. The presence of this embedded malicious object strongly indicates an attack pattern leveraging the Equation Editor vulnerability (CVE-2017-11882) via a spearphishing attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
d0703897745940e02c590de63b6a2c1c2fac6dc0a8d1b652f29c613155c5d38d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 918016 bytes
ooxml_oleobject_00_ole10native_00.bin
4e95286b7f6fbdf0a397629a2ad8a0ae6cff91b561517b3d3ef958d0b0bf998f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10natIVe 908463 bytes

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