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

Static analysis result for SHA-256 23001a18862b571d…

MALICIOUS

Office (OOXML) / .XLSX

14.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 56788845a7bb930e520e223fd08c1500 SHA-1: f75acf89e1f1a0a52cb1321d1816f0e6098ba8a8 SHA-256: 23001a18862b571db68b765c5d19ca9aeb1b51ddb8e20f22edb77927a00821a1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability associated with Equation Editor. This suggests the document is designed to exploit this vulnerability, likely to execute arbitrary code or download a secondary payload. No scripts were extracted, and the document body appears to be technical specifications rather than a typical lure.

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
28cb03769b4151e8691760140e40af4fd175a3f338c5061698e7e27975679dfa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
c7208cff06cb61859327c72c4e2687eb9cf86fc5313a27f03113c825267af4b2		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nATivE 1817 bytes

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