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

Static analysis result for SHA-256 b7eb6f772c63ec36…

MALICIOUS

Office (OOXML) / .XLSX

675.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-10
MD5: cee2a5a00473314ba50670556319c531 SHA-1: bc742ff053d78e51e53ba688dff92b08c56e012f SHA-256: b7eb6f772c63ec369da67b5ece3075b71122757846e5783917d8d0a2ed34ee6f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate an anomaly where the Equation Editor object carries a payload-like Ole10Native stream with an impossible header size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dy4K2.OrF8 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
0713d8184100391f105622fd247431a62dd0a3b7b3aa1a50b055fe0bcec477e1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dy4K2.OrF8 915968 bytes
ooxml_oleobject_00_ole10native_00.bin
5084019b7fdd770f83e3ceeb25a9bf167faf4f9848957dedb6d6edde5ffa0546		 ole-package OOXML xl/embeddings/dy4K2.OrF8 Ole10Native stream: OLe10NAtive 906666 bytes

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