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

Static analysis result for SHA-256 9519aec8ec689791…

MALICIOUS

Office (OOXML) / .XLSX

35.7 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-29
MD5: c54c32304b87e7d53c40dedfc8d5c1fc SHA-1: 37fbdcb5b02e42815cde9a9d89a1e50ca4b2c7f1 SHA-256: 9519aec8ec68979123a1d8c91e39d2c289cd50a8d69cea705b04c2e1d273d30b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: COM Hijacking T1059 Command and Scripting Interpreter

The sample is an Office Open XML (OOXML) XLSX file containing an embedded OLE object. Heuristics indicate this object is a Microsoft Equation Editor object that exhibits anomalies consistent with CVE-2018-0798. This vulnerability allows for the execution of arbitrary code when the Equation Editor is loaded, likely to download and execute a second-stage payload. No scripts were extracted from this sample.

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
05569ce81fe28f7bae2e8574bafaf13b728029b0ebdfb1fe2aea182cfb0a4ee8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
94d7cd4b91b6d546bd368db2a2395d04daaeb44f9b8481a8756cc827dfb6cd46		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NaTiVE 1470 bytes

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