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

Static analysis result for SHA-256 9150f3883b58dcfb…

MALICIOUS

Office (OOXML) / .XLSX

37.6 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: b1173640684a255ed82509ca24ce208d SHA-1: fcb50566f6172fab17c3c7c49f14444d9bf35c90 SHA-256: 9150f3883b58dcfb9d0785132f084152b5ece3783a16c73ad9413d6cd5662455
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The embedded object's native stream exhibits anomalies consistent with this exploit.

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
78265d224036a686ec201cc45e2aef33ad365e80eb52e795738a662934874539		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
846a046905d4a893501ce8f6506998f1309ff4e2e26352bcf61657e4536b06e7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10natIve 1766 bytes

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