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

Static analysis result for SHA-256 a99d3367f576374f…

MALICIOUS

Office (OOXML) / .XLSX

609.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-15
MD5: ce464debf432c86d20143d0ac6a39810 SHA-1: dcb158525d6f5898dd411a6162f91dac3f85a1f1 SHA-256: a99d3367f576374f2ecd4cb7d3c237442cf9b774b11435fb9af1642a74f738cf
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 Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used to exploit a vulnerability. The document body, formatted as an invoice, is likely a lure to trick users into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NwQdRU.0r 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
ac98b064a24ab6b1ad6cac80d3873170a37d41c4cffef577e24005e9c666cbd7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NwQdRU.0r 849408 bytes
ooxml_oleobject_00_ole10native_00.bin
bd14310ef07ca2ba0c90bfef2cdaf41d70c162d0137344f80a24ab87dd3a53e0		 ole-package OOXML xl/embeddings/NwQdRU.0r Ole10Native stream: oLe10NaTiVE 840544 bytes

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