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

Static analysis result for SHA-256 2426f2b02e5edb2d…

MALICIOUS

Office (OOXML) / .XLSX

690.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-10
MD5: 0b4dfbeb77361852447ab5ba4bc70690 SHA-1: ebc0a9dbcf3372cea0b60b621f2b97a3176e0adf SHA-256: 2426f2b02e5edb2d6ef698b37a7d3934b6c14b36fdf9e156b6ec353a4fe71fcb
140 Risk Score

Malware Insights

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

The file 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 header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to deliver a malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5tLo.aGD8 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
dab7a028ad8a83b6b73e82525b0ec1d273b2e17874e285d19be452514888348f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5tLo.aGD8 986624 bytes
ooxml_oleobject_00_ole10native_00.bin
1091f924e033180320e5a7a5bd902710d8753f89080a9e59140b14e26aebc2f1		 ole-package OOXML xl/embeddings/5tLo.aGD8 Ole10Native stream: OLE10NatiVE 976289 bytes

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