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

Static analysis result for SHA-256 dfe0e6b11dab62c7…

MALICIOUS

Office (OOXML) / .XLSX

14.4 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-22
MD5: 3d44b278e13e6d979280c8efa3d9719d SHA-1: ed7e50f888ff7b231be601dcd03f8165f671b674 SHA-256: dfe0e6b11dab62c713e379c0455b008c50e539eb175b3e60871ecbf8fe81b169
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. The document body presents itself as a financial calculation, likely a lure to encourage the user to interact with the embedded malicious 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
10ce4e86989dfd7e696aecb4e8702f74a3613def117be17fe8c4c6721d28e58e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
e759f058f6b9dae19f32c1b95f8c48e23a9df18f6df461394a40f58af3cb693b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nATiVe 1894 bytes

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