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

Static analysis result for SHA-256 a96ecaf295dc1db6…

MALICIOUS

Office (OOXML) / .XLSX

614.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 8977376d481e91aa4ea28347333cf3d3 SHA-1: 252aaddc3abf253fc1f05f705ea9cfa2f1559f27 SHA-256: a96ecaf295dc1db6017ee62d4857328487527ead951828eca4b87434c54fa765
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used to exploit a vulnerability. 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/TqgUUxys.8WJWuZM 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
e3ad8c3d7a1eda7738f181975089317895b647c987b8ff865d1c60d798bfc915		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TqgUUxys.8WJWuZM 840192 bytes
ooxml_oleobject_00_ole10native_00.bin
8fd8a4072f11b913c0ca7997cd23bdac732e1809cc4751c87e7d3c9dd4eef618		 ole-package OOXML xl/embeddings/TqgUUxys.8WJWuZM Ole10Native stream: oLe10NatIvE 831064 bytes

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