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

Static analysis result for SHA-256 46bceffa660ff068…

MALICIOUS

Office (OOXML) / .XLSX

656.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-26
MD5: fca11d4dcb73469b6beb49c092bed3dc SHA-1: 5826f9402ede7e60c646a69d2784bf49bcb91a8d SHA-256: 46bceffa660ff068fcdb424d68b8b773b8dc059e8d7499639342568f38273032
140 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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 size, suggesting it's being used to exploit a vulnerability. The presence of a NOP sled further supports the exploitation of a buffer overflow vulnerability.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XmtSnXIS.8aYPUV contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
f0bd0f59d4b0bf98511f1366183c659b52fe77f4191038d5b9f0fd6b04c6166c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XmtSnXIS.8aYPUV 922112 bytes
ooxml_oleobject_00_ole10native_00.bin
d28130aa93939dbc14005331a7e3299a01c07883494a3bd0c941c8b2c4e10dc3		 ole-package OOXML xl/embeddings/XmtSnXIS.8aYPUV Ole10Native stream: OlE10NATive 912012 bytes

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