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

Static analysis result for SHA-256 61865a9899d0c5ab…

MALICIOUS

Office (OOXML) / .XLSX

662.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-06
MD5: 78712f7ab718adb525ea8860ce4921da SHA-1: 476caed189b456b0afb86109df5e38801c1ddc30 SHA-256: 61865a9899d0c5ab25d0459d57f6e9e0873e18f50d5b67dbf6f23b3ffa194c65
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a known vulnerability. This mechanism is commonly used to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dFcd7D.hQ0TDVD 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
6fa2f47c8749ad24f807f751a812ed5fab94aa13091c0ca7107f05ec3cd02788		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dFcd7D.hQ0TDVD 982016 bytes
ooxml_oleobject_00_ole10native_00.bin
7febd1d873bbf4fc7e15e2de066e7a2070e009eb23d0aee50728adfe06bc8134		 ole-package OOXML xl/embeddings/dFcd7D.hQ0TDVD Ole10Native stream: Ole10nAtiVE 971841 bytes

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