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

Static analysis result for SHA-256 0cf86ea4ff0b2755…

MALICIOUS

Office (OOXML) / .XLSX

700.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: e7b2ca258ad113d3d484d48c81a5b196 SHA-1: 681271ef07c6320a76247f3b5559b4abccd626ac SHA-256: 0cf86ea4ff0b275550e406f3d1b38126dc4d38fb82c70cb77ac7a8c306dcd9f3
100 Risk Score

Malware Insights

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

The file is an Excel document 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 exploit a vulnerability. The embedded OLE object is the primary indicator of malicious activity, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vTPYD6E9.Qf 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
480514ac93b95f7703a4e9df5aeb35fcaab870280c3d42dd69f461db8a7c6abe		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vTPYD6E9.Qf 983552 bytes
ooxml_oleobject_00_ole10native_00.bin
94c19adf4f12341d550361d814d73131dc122bc4456149efebd036f986f89c36		 ole-package OOXML xl/embeddings/vTPYD6E9.Qf Ole10Native stream: OLe10NatIVE 973489 bytes

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