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

Static analysis result for SHA-256 c812ed09247d0d85…

MALICIOUS

Office (OOXML) / .XLSX

18.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 873e03a7214a80ac96670fac9a6679c5 SHA-1: a57e1645eacfec061fa629325b038cc8e1233f2b SHA-256: c812ed09247d0d85d0157ee0546375afaff1f82b1c317142baba488d97a1ae77
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing T1059 Command and Scripting Interpreter

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to exploit this vulnerability, likely to download and execute a secondary malicious payload. No document body text or scripts were extracted, limiting further analysis of the specific payload or delivery mechanism.

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
54dbb287c7b3fdb33978e42dd8592baf1eca0c48c69ace45031125dcd1359b78		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
0667bb9542c6d351f2931a27503f2646e9ff2059dbfb72826c6dcadc395f8d8b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NatIvE 2064 bytes

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