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

Static analysis result for SHA-256 3292107f8f886b81…

MALICIOUS

Office (OOXML) / .XLSX

19.4 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 7947b40300fbfb1d04eea70d6decf3c0 SHA-1: 214528e0a6fbc8d2542b17573fd4928e89bb9ad3 SHA-256: 3292107f8f886b818086504892eb8ad4fd63f9b444c761c4429cda4136c5bcca
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. Heuristic firings indicate the presence of an anomaly consistent with CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution when the object is opened. No document body text or scripts were extracted, but the presence of the vulnerable OLE object strongly suggests an exploitation 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
5e9ff7b23bfb4102f9fca0554e2f4d32c52b713701220601072c1504bfe2e1dd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
a5189272d45f581d0fb573c4d3a388bef4bba55a3b6962198dece5ad3bb3effa		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtive 1590 bytes

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