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

Static analysis result for SHA-256 5ea837c64ac4168e…

MALICIOUS

Office (OOXML) / .XLSX

659.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-02
MD5: 5208bc7313b3bb4ed04de58ee3c36a14 SHA-1: dd9d32202ec444b7572891aa1e9c8436eeaa5676 SHA-256: 5ea837c64ac4168e69e8afbd9a249ffd1e76d7eabf829b306d8c7858d487d8d6
100 Risk Score

Malware Insights

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

The file is an Office document 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 and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This technique is commonly used to execute arbitrary code or download further malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MdSEWZ.KSFK0 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
c5f94371e7afc11fd013a581d99203ca67499b6d7d70a64bdb4d18d9dbd55231		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MdSEWZ.KSFK0 942080 bytes
ooxml_oleobject_00_ole10native_00.bin
d7507ed7ea14605cecb0b219844d5f58e7de0eb7dd0f8ae33eb064d1b336c617		 ole-package OOXML xl/embeddings/MdSEWZ.KSFK0 Ole10Native stream: oLE10NaTIVe 932191 bytes

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