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

Static analysis result for SHA-256 86bae0f75e1ed0d9…

MALICIOUS

Office (OOXML) / .XLSX

578.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 49ef8e9c9bf1d4a9325b7e0a838c95b5 SHA-1: e2b3e2d2f7432c18e3f7f60072a1c77ae247c23c SHA-256: 86bae0f75e1ed0d968378df8eb278a548df3ffb315638cc9ac2eb29b826d2237
108 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to an anomalous native stream. The presence of a hidden worksheet further suggests an attempt to conceal malicious activity. The primary attack vector appears to be the exploitation of this Equation Editor vulnerability to execute a payload.

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
866f33a601fedf6211496e883101122260f5d6c56282cc01562ab0e41f93100f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
46d22d595a8b698832796f91f9d3e75b25d45edc60c0bd9bdd55e12dd62d7f7a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10nATiVE 1723 bytes
emf_00.emf
e7b56444f48d254fdc7ae08be573d2b06b627243643f5d1b78996a2df7ee09a7		 ooxml-emf OOXML EMF part: xl/media/image6.emf 653280 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.