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

Static analysis result for SHA-256 370cb3be5f83b596…

MALICIOUS

Office (OOXML) / .XLSX

743.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: a6e19ca134a684f34e75fe81e5e25828 SHA-1: 2aaa273bf4e72ae34b4abddf88dec767291216d9 SHA-256: 370cb3be5f83b5963dfcea120fbd93e52933d1d43c6d8c771a406da165b06ae8
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/O5cb.s428q 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
954017b6a26b942c72f96fd8bf73722afb032e37444facfd4c0b5e4ab078c3f3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/O5cb.s428q 1058304 bytes
ooxml_oleobject_00_ole10native_00.bin
eb83f344538b6fc2ebd93b6140c925f5443a45a8aea4197cf0e1c27672f09c29		 ole-package OOXML xl/embeddings/O5cb.s428q Ole10Native stream: oLe10naTiVe 1047068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.