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

Static analysis result for SHA-256 76513fd44e378f3e…

MALICIOUS

Office (OOXML) / .XLSX

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: f6d0aec9c27ca48b7bd090732b1f7e94 SHA-1: fcbf3218f2a843ef2bba9a704a17110455c6ce10 SHA-256: 76513fd44e378f3e3e5b164c4936cf90af3d6aba033e48db5bad9d6ba693917f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a malicious Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, a vulnerability in Microsoft Equation Editor, which allows for arbitrary code execution. This suggests the document is likely delivered via spearphishing as an attachment.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
edbd39f2a458b9c28d267bb6e9a507856fd40afb9fcd126fc68ce97c3790fafb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
f44b2eba0ddf5ade3bd4c33498b34901959ae0cac2a6e1c56aca1886de44e285		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10natIvE 1871 bytes

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