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

Static analysis result for SHA-256 e0bc5bcd5c617842…

MALICIOUS

Office (OOXML) / .XLSX

17.8 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 4a5565827428ba082970a86510d465de SHA-1: f620b11f26a08e8c4c90326c1cc4e51668d0016f SHA-256: e0bc5bcd5c6178422a8e85184462258caaaa06537dca1ff917ded53e4372a955
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798 within the Equation Editor's native stream. This strongly suggests the file is designed to exploit this vulnerability for client-side execution. No further stages or IOCs were extracted from this sample.

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
e1019266bf3f7d967882b7ed70ae740416229ee9911aeeebf8d5203652df1992		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
caafa58c6bb63710c19bca238cb6df99cacbb1341a8851231910ce0f8f0f4ddf		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTIVe 1554 bytes

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