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

Static analysis result for SHA-256 40cb693af6caecc0…

MALICIOUS

Office (OOXML) / .XLSX

618.6 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-18
MD5: e4ccb5e31b5a188195d32ea0b334a102 SHA-1: f360184d78785a794bab5e30f1b980e9816544d8 SHA-256: 40cb693af6caecc0f28ca56d89f568b355051e76f6451fd9e4fa655507105bbe
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting Equation Editor vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TpCERns.qQp 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
7013177404ef3895ceaa212d3e80d61cdbc3f6f7c28e2b1bde7f318a54bb4bb9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TpCERns.qQp 887296 bytes
ooxml_oleobject_00_ole10native_00.bin
6000a05bf24b850d49bd384740670fa173e2f7f986baf45245ec82291688dbf3		 ole-package OOXML xl/embeddings/TpCERns.qQp Ole10Native stream: OLE10NatIve 877905 bytes

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