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

Static analysis result for SHA-256 d98c78a6be95cbe2…

MALICIOUS

Office (OOXML) / .XLSX

666.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-22
MD5: aeb81eaa7fcde19d1b61403da5239d65 SHA-1: 63646bbed3b2272057f912058cb4a174c631f2c3 SHA-256: d98c78a6be95cbe290e0f0b5025e8b625c3adb9742e716b7af88821f9dc997c9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel document 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 size discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/EqqGtq.tyx 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
781e4aca2db3d891983516fc171873227c9eec932032518a543c51ee5c80212e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/EqqGtq.tyx 975872 bytes
ooxml_oleobject_00_ole10native_00.bin
0ec6fc8cdae407e97d98cced71d36089e1590ac2934d3f68bac5b64c56cc8e73		 ole-package OOXML xl/embeddings/EqqGtq.tyx Ole10Native stream: ole10NatiVE 966142 bytes

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