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

Static analysis result for SHA-256 da1d8803c91f9ed3…

MALICIOUS

Office (OOXML) / .XLSX

734.2 KB Created: 2023-08-29 22:52:26 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30
MD5: 0715fdf5c87fb61bbbcfceb48cda5ad5 SHA-1: 32b43332af7b48d5bca86e2f4e1a2daba5fb5983 SHA-256: da1d8803c91f9ed37405733528d0610fe795c66c95c2e71175568853e80b9ac9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an Office Open XML (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, strongly suggesting exploitation of a known vulnerability within the Equation Editor. 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/P8j2Ur.pbUMbxb 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
10400c07a3c8232dcfd34e5a80f19661bac666ca3d4602fc1a2f4a4c5b8f5523		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/P8j2Ur.pbUMbxb 1088000 bytes
ooxml_oleobject_00_ole10native_00.bin
e0c1bccdffd770d58c76e08016bb72947333cdecae672c7d879c6368ea5b3ae2		 ole-package OOXML xl/embeddings/P8j2Ur.pbUMbxb Ole10Native stream: ole10naTiVe 1077187 bytes

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