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

Static analysis result for SHA-256 ddd653729d1e255b…

MALICIOUS

Office (OOXML) / .XLSX

727.3 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-12
MD5: f4d150cfd76b9358e4e27cb4730d9eaa SHA-1: c413eada17c6be4cf84e0a71d327ddbd8e27d9d1 SHA-256: ddd653729d1e255bc3828d5b021f46ce19c87deb6589846e1f39b931c1a59bb0
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 Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and an impossible declared inner size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The presence of this anomalous object is the primary indicator of malicious intent, likely to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Q0Kp.B7 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
b077e436804f15f138719ae43cc6c4dad8ae153d8e9c3a84d4e6b41be1d7d7b8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Q0Kp.B7 1076736 bytes
ooxml_oleobject_00_ole10native_00.bin
d20282d8d9c7a9ab045ee6323fbc451397776116c918a1fa1fd3f8ec57f0274b		 ole-package OOXML xl/embeddings/Q0Kp.B7 Ole10Native stream: Ole10NAtIvE 1065619 bytes

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