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

Static analysis result for SHA-256 e0b0b2c26cdf9579…

MALICIOUS

Office (OOXML) / .XLSX

222.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 299b03fc8988772ed39c918e7e301754 SHA-1: 3afd3fe9d41f06f0f2694cbbbdcaaf9714c43a3c SHA-256: e0b0b2c26cdf9579f3e8cd3bcb39f31c6779ad656ebe9e8323fdfe1f80c2a069
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The sample is an Office Open XML (OOXML) XLSX file containing an embedded OLE object. High-severity heuristics indicate this OLE object is a Microsoft Equation Editor object that exhibits anomalies consistent with CVE-2018-0798, a vulnerability allowing for arbitrary code execution. The presence of a hidden worksheet further suggests an attempt to conceal malicious activity. No scripts were extracted, and no document body was available for 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
89be6fc9fe31afc45142436af89fe8e21ffe647a3b3ba1a8548ce985cdaa1bf9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
bd7c2dc3af14a62712f9f490ed7f5d2f0cdd66d97c7db0045c2b425b0983e847		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatiVe 1504 bytes
emf_00.emf
b91a182611adecaacdcc63204386a7cc76530cf305864ba079122fec4be3f10a		 ooxml-emf OOXML EMF part: xl/media/image8.emf 498420 bytes

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