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

Static analysis result for SHA-256 4977040fa9bfebab…

MALICIOUS

Office (OOXML) / .XLSX

644.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: 24b195342d2d7cd36ad43f0beb8432c4 SHA-1: a66629cb2e75b8b84b91c0c645ad0067b0f0aa46 SHA-256: 4977040fa9bfebabca090e00dc6165e48f28b4851a748215f5f05627f407005a
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 size, strongly suggesting it's used for exploitation. The embedded object's path and stream name are logged as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/R2TCsP.gv3W91 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
6fbbcfbb946d046efa209761ca18dde7a43a77aec34c151ef0d63497ce8f4b9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/R2TCsP.gv3W91 914944 bytes
ooxml_oleobject_00_ole10native_00.bin
36972afe5c8e34cd6fab49ed3f13ddf7b5d5c992cf313993df15c74a9df44a48		 ole-package OOXML xl/embeddings/R2TCsP.gv3W91 Ole10Native stream: OlE10NATiVe 905714 bytes

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