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

Static analysis result for SHA-256 77b840f8ad0f174b…

MALICIOUS

Office (OOXML) / .XLSX

715.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14
MD5: 9200eb56e37f7822b0c3fa9592f7d80c SHA-1: ad180d3bba7ef89ad1744b709cecdb8babe18bc4 SHA-256: 77b840f8ad0f174b0460f06edde181e8726fd35f89e4c41fe9ba757c82f66cec
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object specifically identified as an Equation Editor object, which is a known vector for exploiting vulnerabilities. The 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' heuristic indicates that this object carries a payload-like stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting it's designed to deliver malicious code. The document body appears to be a business-related order form, likely a lure to encourage opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ceSYC37E.7YGcio 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
2412c1c071cf40810712090fc9227cb2b3c8cb83d126d5f7e012ca26d4d3859d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ceSYC37E.7YGcio 963584 bytes
ooxml_oleobject_00_ole10native_00.bin
c9bcb63a547efcecc9e5f1220d4793688b9c694547c9eea2f51240f8ff2d0616		 ole-package OOXML xl/embeddings/ceSYC37E.7YGcio Ole10Native stream: OLe10NAtIve 953407 bytes

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