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

Static analysis result for SHA-256 b51bd97cffc17c64…

MALICIOUS

Office (OOXML) / .XLSX

734.1 KB Created: 2023-08-03 17:25:14 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-04
MD5: ee60b722a04cee171d80e81183d7a2c7 SHA-1: 6f079a616330b9c92f7bd2a192bf3112fef92877 SHA-256: b51bd97cffc17c646bf7a7fe17879d7b3bf1504ba1da5af379f301058e530a83
60 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. This type of object is known to be exploited to execute arbitrary code. The presence of this object strongly suggests an attempt to leverage a vulnerability, likely CVE-2017-11882, to achieve code execution and deliver a secondary payload.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3w66rl.kS contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
16403a125f4cd506db36483369789b08df190cfa73b16f477a96f43ceeca30de		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3w66rl.kS 1035264 bytes
ooxml_oleobject_00_ole10native_00.bin
a40959ace425567854adca92b790a0075c5282f4918b4e1aaece6b38e0acafff		 ole-package OOXML xl/embeddings/3w66rl.kS Ole10Native stream: Ole10NaTIvE 1024903 bytes

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