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

Static analysis result for SHA-256 5e562b6b714f82b6…

MALICIOUS

Office (OOXML) / .XLSX

684.0 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-21
MD5: 16e434ace9b5a084fba42f70528d9eae SHA-1: cb44afeb7dd4ce8e846cddeca632977498522d2b SHA-256: 5e562b6b714f82b655e50693ab12ff9ff1ffded572329ba98c2114b21e9da302
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as an Equation Editor object, which is known to be a vector for exploiting vulnerabilities. The high-severity heuristic 'OLE_EQUATION_EDITOR' and 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' strongly indicate that this object is designed to carry and execute a malicious payload, likely leveraging a known Equation Editor vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/u0Qls.uYw1YG 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
e528b140c64485c24bdf23d5b68dab74cb6ea9a812283dbae7ff1c873aa941e8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/u0Qls.uYw1YG 995840 bytes
ooxml_oleobject_00_ole10native_00.bin
5b83cd59c33c90f3f0569b68ea96fd6845b288ff4cf5d812399c56ac6f3b2370		 ole-package OOXML xl/embeddings/u0Qls.uYw1YG Ole10Native stream: ole10nATiVe 985149 bytes

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