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

Static analysis result for SHA-256 b093e1eba85ec117…

MALICIOUS

Office (OOXML) / .XLSX

222.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 6077704f09d93f44db2dffb1b83322fa SHA-1: 3bb3abf4d2dfc98651d3be5447478d8bbdbabe58 SHA-256: b093e1eba85ec1175b8bca609cd5709f937c4d84b4f7b0e38cd53f21eb549439
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: COM Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, suggesting exploitation. The embedded OLE object and associated EMF file are likely components of the exploit delivery mechanism. No document body or script content was available for further analysis.

Heuristics 4

  • 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
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
745fb32840e301bf1842b93f024d7d9f7d3b05975f7a71b42385bfd2d2653c38		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
3759746b170ab18022d6364da6124d1edafc5383b05c497d68135671172520e8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTivE 1842 bytes
emf_00.emf
7a02f0ca9d41cde024fb5e0835ead768bdc0025649a3faff8930401f8bc597fd		 ooxml-emf OOXML EMF part: xl/media/image8.emf 498420 bytes

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