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

Static analysis result for SHA-256 5bcb4ee1ab98784b…

MALICIOUS

Office (OOXML) / .XLSX

726.6 KB Created: 2023-09-25 22:38:35 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-26
MD5: 5f60536a504ebd1fe6a94ed218a3e215 SHA-1: 23ae28ee26d5999fdc2ac10a986cdc6c1e237276 SHA-256: 5bcb4ee1ab98784b0900384e073f911bf3bfd8145c9e5bccd743b6f5f896e873
100 Risk Score

Malware Insights

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

The sample is an Excel 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 size, strongly suggesting exploitation of a known vulnerability in Equation Editor to execute arbitrary code. The embedded object's path is noted as an IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Wy2kMza.K4bq4DF 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
4742fcb3a0c49f21345a7196c25ec03753ab683eeb5b0c43f3f95a9a1d4d8bf8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Wy2kMza.K4bq4DF 1076224 bytes
ooxml_oleobject_00_ole10native_00.bin
944cf032bc78bc36dd4208584c64297b0995072933e0ced83679735b8f9f13b8		 ole-package OOXML xl/embeddings/Wy2kMza.K4bq4DF Ole10Native stream: OLe10NAtIvE 1065153 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.