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

Static analysis result for SHA-256 48b48328d16bfb82…

MALICIOUS

Office (OOXML) / .XLSX

36.6 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 15.0300
MD5: c839b15948c2cbe473767d2067783f62 SHA-1: 3d630c3b7d5b9193c871ac92102557da32c29d8d SHA-256: 48b48328d16bfb829b265085d1cc9af8edde2240cf50ac2561f052bfe27a5208
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, suggesting exploitation of this vulnerability. The embedded OLE object likely serves as a dropper for a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
912d1fb77245379587df18537c850583be594dd0b19944ce39ff35a682ea2102		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8c77d2b191b46d237d4e0d277938745b80091e3bbdfc683c41b8b3357dfe982a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2027 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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