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

Static analysis result for SHA-256 50be581796e5b156…

MALICIOUS

Office (OOXML) / .XLSX

14.8 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: 34063bcdce52d9a6e120c86968c8b5c0 SHA-1: fdb2bcb6848fe0ef250dff21d25b696fbd920ec0 SHA-256: 50be581796e5b156b75c92ef57b4b2d74fac71a7f94b4cbd7c8aa76bba0a2858
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1559.002 Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream data. The document body contains a clear 'ENABLE EDITING' prompt, a common lure to bypass macro security. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper or exploit for a vulnerability.

Heuristics 4

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
bd8b62232035dbaec5f144bc2ebfa10cf26ef10356c66b51ca334c96096b425e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
116ca89e36f3a7bb8b1ad64fa151711cfcaa0dad8908f8f89e6bde996a3d977d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NATIVe 1614 bytes

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