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

Static analysis result for SHA-256 e39d474a4787ee5e…

MALICIOUS

Office (OOXML) / .XLSX

718.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-20
MD5: 8af05b6dae30d775b9a767d385c4ebb1 SHA-1: 8104ac747b4b8a4bdb82234b7e57cf328cbdcd05 SHA-256: e39d474a4787ee5ee1c0dbec0728d33e36a74ec320b1a8680ab2eca4ec653644
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. The large declared inner size and anomalous header further support this, pointing towards the execution of a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0QiIaL2.0cxgg 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
ae1f5264beaa93ec5b721c2c2d1079e31135632dc50dfd6292aabb75da8c0131		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0QiIaL2.0cxgg 1020928 bytes
ooxml_oleobject_00_ole10native_00.bin
2ad5808a900e199eea64a447b5c6bb6c35de3181e69fb3f534acd477ad25090f		 ole-package OOXML xl/embeddings/0QiIaL2.0cxgg Ole10Native stream: oLE10NaTIve 1010329 bytes

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