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

Static analysis result for SHA-256 65e8917946a978a0…

MALICIOUS

Office (OOXML) / .XLSX

725.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-17
MD5: 16e546a8202702091739c35484ba1cd3 SHA-1: 8220a7fc4abe77109b3eb80ae7211997603287d3 SHA-256: 65e8917946a978a0b09b14d4177fa4e6e71ded6bd48ab91414fa81a1e2a519b7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an OOXML 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's designed to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dSh63N.tXVpP 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
07b2f187625b7961122c192e9aba9652bd5eae94c717e9486a0bd3b38257691b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dSh63N.tXVpP 1061888 bytes
ooxml_oleobject_00_ole10native_00.bin
45de9e0b1b71640688b02d408539e1c1c283caf887076d51e699ec0439286301		 ole-package OOXML xl/embeddings/dSh63N.tXVpP Ole10Native stream: OLe10nAtIVe 1050991 bytes

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