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

Static analysis result for SHA-256 5922af008f0edeba…

MALICIOUS

Office (OOXML) / .XLSX

660.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-28
MD5: bbaa5659e05412090ee8e203245b7d53 SHA-1: bd737af5f066fee927f781551d69776f9ae4f59c SHA-256: 5922af008f0edeba71a7dd685b9dd7092c4ce79ffeaea2d98f225abe8b5fa320
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel 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. This points to exploitation for client execution via a component object model hijacking.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rGdR.jIK 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
7bae84794ee4454d66b2892cce168cd0684873b1a13f6515896b332677fe72be		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rGdR.jIK 983040 bytes
ooxml_oleobject_00_ole10native_00.bin
4da62e3be446bf15a7d929db1fe62c0b77225971cc51772f53e572520685c7a7		 ole-package OOXML xl/embeddings/rGdR.jIK Ole10Native stream: ole10naTIvE 973232 bytes

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