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

Static analysis result for SHA-256 74a2d16e3f3e53a5…

MALICIOUS

Office (OOXML) / .XLSX

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 3e42711d09c533c6bcbe44e545512971 SHA-1: b492d61fdd734a634e7151aeb12a4cb6c028e036 SHA-256: 74a2d16e3f3e53a50a3c0f5c6326e7bb80ddcc87d229b62ceee740ad9262848d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Excel file containing an embedded OLE object that exploits CVE-2018-0798 in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No further payloads or network indicators were observed in the static analysis.

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
24f34c89688d2bb31930cc3f16086e515f7d366b6979b99bd720c49ed1e5eccc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2d5fffae5e4130430567cba0acda31ea2934797f46101b768e9746eee00582d5		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10naTIVe 1869 bytes

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