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

Static analysis result for SHA-256 3f45936c54aa5e36…

MALICIOUS

Office (OOXML) / .XLSX

14.8 KB Created: 2023-03-13 06:58:13 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-03-30
MD5: 26ab0d5e4a745d89e9e2c75919bbf7e7 SHA-1: dad77fa11bea021c82fe762078fd3018fdc95a89 SHA-256: 3f45936c54aa5e36d7b4bc6482ea1fd8c8d902f5cf589e8a14d252e3f70fca17
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. The document body contains what appears to be a fabricated order for medical or grooming tools, likely a lure to encourage interaction with the malicious embedded object.

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
8076beee99baa9c36b515c2ddf266f95be54e6ad9e5707c90dec44428428ef6c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
8fd82f400eb82c66e96eaa54b7f54508702ccf38aca50a04abc4f4f926660418		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NatIVe 1494 bytes

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