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

Static analysis result for SHA-256 5b18feead020e741…

MALICIOUS

Office (OOXML) / .XLSX

661.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-20
MD5: e18dcd3c05bbc02ad35c79424e3a02f7 SHA-1: f1fe7d2b44244647900ae7c45be0afb7ccd6571d SHA-256: 5b18feead020e74154b74adcb42cc153b2b6569732360de993563a66d468daa5
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the file is designed to exploit the Equation Editor vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OH3ccCj.PTH1h 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
88031bb206bbde88a359696696fea0e0ff197aa839d4eead77c538ab47733477		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OH3ccCj.PTH1h 931840 bytes
ooxml_oleobject_00_ole10native_00.bin
58ec77756a121d458306391423534abf6ab15a29ea8456c9ec049b6835f72f64		 ole-package OOXML xl/embeddings/OH3ccCj.PTH1h Ole10Native stream: Ole10nATIve 921882 bytes

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