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

Static analysis result for SHA-256 8e905091f91d0630…

MALICIOUS

Office (OOXML) / .XLSX

621.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-21
MD5: d5b22b1dba1383b79483719d4362d161 SHA-1: 3b0b2f613f32298396765dacb0d6cd8cb5b5953d SHA-256: 8e905091f91d0630a620a81de0a47de87a53c08c47427ee879b7588ee308b28d
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 declared size mismatch, strongly suggesting exploitation. This technique is commonly used to deliver secondary malware payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7KFXUL7.E4J5GPJ 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
b285e9d62127c909f092169bac890e4f2ed02da47a5e1d6d87fed545c0d4c448		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7KFXUL7.E4J5GPJ 890880 bytes
ooxml_oleobject_00_ole10native_00.bin
1259b91735228fd848bc460daeb81e1b5ee3206d2eb335ef86f1190724ce8c39		 ole-package OOXML xl/embeddings/7KFXUL7.E4J5GPJ Ole10Native stream: oLE10nATiVE 881380 bytes

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