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

Static analysis result for SHA-256 6d4977cb739bd60e…

MALICIOUS

Office (OOXML) / .XLSX

896.0 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-02-06
MD5: eb5418b2d45b0f361fa93f01139871d0 SHA-1: 882c97f3fd9b406183e4ac01396ff41fabb2c1b3 SHA-256: 6d4977cb739bd60eaf1bd6cea2258cf09a2aaab71a3646f8c055ba9fbc5db6f5
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1559 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload, likely exploiting CVE-2018-0798. This suggests the file's primary purpose is to leverage this vulnerability to execute a malicious payload upon opening.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/HocylJ.qO contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
0d3ecc24e3a88b16491d79325f0daf01e1a1beedc97865c109c0253cd27ad64f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/HocylJ.qO 1227264 bytes
ooxml_oleobject_00_ole10native_00.bin
70a58567257d8fb51e7002f229f898cbf6922157e17dc675a3458566700e1443		 ole-package OOXML xl/embeddings/HocylJ.qO Ole10Native stream: OlE10nAtiVE 1215382 bytes

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