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

Static analysis result for SHA-256 6aee93178f6d1b7b…

MALICIOUS

Office (OOXML) / .XLSX

599.9 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-06
MD5: ee1f7423d072b5bb49d9adc7f19a143e SHA-1: 9bb96d14a965ef0c3b99c572bdbf53ccc52b09a9 SHA-256: 6aee93178f6d1b7b4d732036fc62a8abcecfbad706ac9303ac5d3ca36bdffba6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1137.001 DLL Search Order Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The document body presents financial data, likely a lure to encourage user interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gLV.8AhSa 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
8aa7082d4170fd0087770e75a45d674503005484833dde1ef18352df7d050c29		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gLV.8AhSa 819712 bytes
ooxml_oleobject_00_ole10native_00.bin
9b839b8740b6a6662293f655c01f62cd9a9d4881d5a612e82cbebd46c441163b		 ole-package OOXML xl/embeddings/gLV.8AhSa Ole10Native stream: oLE10nAtIve 810982 bytes

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