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

Static analysis result for SHA-256 ebdb7ea5dd517e23…

MALICIOUS

Office (OOXML) / .XLSX

643.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-06
MD5: 71f824814b9caa6df123d294f9d3e30f SHA-1: d82ace03200b333a4007889ab63d6ee48d4374a2 SHA-256: ebdb7ea5dd517e23a7bfdb114edd529363cccef6c4ddc4271d9b5e3f4da36180
100 Risk Score

Malware Insights

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

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 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/OwrNB5.xW81DA7 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
741d2645cca8c98552a504661e4a8340fc7326129dfb0ffb9f4bbbb59d7d942a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OwrNB5.xW81DA7 861184 bytes
ooxml_oleobject_00_ole10native_00.bin
942d2c120e69b79a74b26b478164c42329eb5bc2a23f8e101c67ef472c6d10c6		 ole-package OOXML xl/embeddings/OwrNB5.xW81DA7 Ole10Native stream: OLE10NAtIvE 851610 bytes

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