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

Static analysis result for SHA-256 b0696a88c5c0c9d0…

MALICIOUS

Office (OOXML) / .XLSX

8.8 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 6381ca8d8726bacc65c588535dbb8398 SHA-1: 238c8b5f9e4db7a99401b928857473844fd63f6c SHA-256: b0696a88c5c0c9d0a06f9b0316c854a3784d79ad0ca5bb4cb055ded62285a286
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a vulnerability affecting the Equation Editor. This suggests the document is designed to execute arbitrary code upon opening, likely leading to a further stage of infection.

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
75fa534353a8c7e31ab9bfd2cf242b9cbb93bf744db5f42e071b5d196c28b28b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
ffa9ce3591da9282c690af649b71e121e9e791288a27cd91c7ec1b4af69fca9e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10nAtIve 1895 bytes

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