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

Static analysis result for SHA-256 4670e9c00fc2fd7c…

MALICIOUS

Office (OOXML) / .XLSX

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: cbf5a9027344d8d5f7498f317138caff SHA-1: c16af50965a4cd3349b5cb844576d248a6abf77f SHA-256: 4670e9c00fc2fd7cd756e02782933318b2ac8e5a61cd57ddcb4072de13a14707
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The analysis identified an embedded OLE object within an Excel file, specifically targeting the Equation Editor component. High-severity heuristics indicate a likely exploitation of CVE-2018-0798, which allows for arbitrary code execution. No document body text or scripts were provided, limiting further analysis of the payload.

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
35a8b16c56ec99feda4de4fb0adc5c3e5d48a831a37be346e80dbaa467ff89f8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
01088c8b5084eac9598368daed47e04600dae412b373c9f26fbe024bbcb4ca5c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NAtivE 1998 bytes

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