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

Static analysis result for SHA-256 d4af8019f4fb6f83…

MALICIOUS

Office (OOXML) / .XLSX

716.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-28
MD5: 34c74ed2300a242fb0c974a51c8c72e3 SHA-1: 5221f4f8f3d4c208cdba6933ed4eb9d6e6919021 SHA-256: d4af8019f4fb6f832ad72af1304293684e5299a6f263228206efb74569d10e4b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. This is a known technique for exploiting vulnerabilities like CVE-2017-11882.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pWx.VpGjAnp 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
0c93f6b8ba9d3b710daa9ab8a07a903dd6d9a3bd9035c67926adbcb96e76e74a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pWx.VpGjAnp 1048576 bytes
ooxml_oleobject_00_ole10native_00.bin
d14d51ad46f689c0b873151f2812c76355f748ccd05ce3b5d8b606309b7dff8e		 ole-package OOXML xl/embeddings/pWx.VpGjAnp Ole10Native stream: oLE10naTIve 1038101 bytes

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