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

Static analysis result for SHA-256 36881c60ecc42da1…

MALICIOUS

Office (OOXML) / .XLSX

18.1 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: d17189eabc7ba5b7dc3dcca70e5aa90b SHA-1: efff2d675ac8c9e3e16effb5859c04f87b6251f6 SHA-256: 36881c60ecc42da1a8b8ecb5bf267fff8eb8c00b2f8c57f1c112ac17746aa112
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object. High-severity heuristics indicate this object is a Microsoft Equation Editor object and exhibits anomalies consistent with CVE-2018-0798. This suggests the file is designed to exploit this vulnerability for initial execution. No further stages or IOCs were extracted.

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
1ef7607edd5c26d6e2ec45aa71589981712cd81db80146ebade7cf8cc87236ec		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
ae8322f44ca78e8471de9307e548e13af2de1adc11d92cf1e02c839681030fd9		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NAtivE 1975 bytes

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