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

Static analysis result for SHA-256 3be5b20825ff5414…

MALICIOUS

Office (OOXML) / .XLSX

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 94874dd39fef1028359b680bcd6d262f SHA-1: 76502ef6fbbe87eb05f3ccb532be867419469b11 SHA-256: 3be5b20825ff5414b72b86a123fadae59468a06f7e7f9962ba730469cf0d27b3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. No document body text was available, and no scripts were extracted, but the presence of the vulnerable Equation Editor component strongly suggests an exploit attempt.

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
7fcf80095f622f95f378ca4c36019dcd54230420e53823288e4b74e726f44853		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
ee714666d19f42541484a151e3667a6fac12b05f0979f634c6e5b83cd1e70af9		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10natiVE 2016 bytes

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