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

Static analysis result for SHA-256 b05e38d487c66181…

MALICIOUS

Office (OOXML) / .XLSX

704.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-17
MD5: 12d500a9220fa04b771557a148485bf5 SHA-1: 5951a8d33df184bf3715bec557d34fc753cb8cd6 SHA-256: b05e38d487c6618129937d8ffef99ed26a0da8a80e9c454c8f44b9bce4340e7b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The XLSX file contains an embedded OLE object identified as an Equation Editor object. This object exhibits an anomaly in its Ole10Native stream, suggesting it carries a payload. The presence of an embedded OLE object, particularly an Equation Editor, is a common technique for delivering malicious content within Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QITh96.ezpdLH4 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
c466ef67caed4f27d0ca8fd6ed5320775eb4c34ba9d73c5740b32889c756a7c7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QITh96.ezpdLH4 1027072 bytes
ooxml_oleobject_00_ole10native_00.bin
0de8432e435f14381831d321a5c2ddef6d1e7f3e8aa1ff299902e3d247cb574b		 ole-package OOXML xl/embeddings/QITh96.ezpdLH4 Ole10Native stream: oLe10natIve 1016752 bytes

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