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

Static analysis result for SHA-256 f858ed2e4d44d422…

MALICIOUS

Office (OOXML) / .XLSX

10.7 KB Created: 2022-11-20 23:27:11 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-08
MD5: 08ea604f05ff7b003fe8d3a25153988b SHA-1: 1d21dd01cbd16cd659701893fbac49b211e8f830 SHA-256: f858ed2e4d44d42258d352aee6dde26a11166e1da5ec6369415f312e918705cb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link

The file is an Excel spreadsheet containing an embedded Equation Editor OLE object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This exploit is likely used to download and execute a secondary payload, making the document a delivery mechanism for further malicious activity.

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
1cb2c66667bfa11e0c95b2442110bbaeb41ee71066fabc894d7c9c4fe34d5cb3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
36aef155e74aa46cf88a85617364a8c6589a1afaee13f2e34755edb089607bef		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTiVe 1698 bytes

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