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

Static analysis result for SHA-256 0530d54b2b599143…

MALICIOUS

Office (OOXML) / .XLSX

665.4 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: f290c0ba11cf19dd6f4950c9a5668c45 SHA-1: 0c9889f0c02c53ecf67588d279d02ad948cf0d93 SHA-256: 0530d54b2b5991438af0651976bec3a26660b2df5f6e21669700f48c9e810df8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel spreadsheet containing an embedded Equation Editor OLE object. Heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering secondary payloads, often for financial fraud or credential theft.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VKh.65Bf7 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
afedb2dfdc7ef5d282a49bb86326aa42ef8e75354348a8f9a7a850c49efb4aa8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VKh.65Bf7 904704 bytes
ooxml_oleobject_00_ole10native_00.bin
26c8113407a652ec7fc5305d11e27ec1501b3b8bef0af511ec86accd9cb352e2		 ole-package OOXML xl/embeddings/VKh.65Bf7 Ole10Native stream: OLE10NatiVE 895392 bytes

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