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

Static analysis result for SHA-256 b121d68b9df8a21a…

MALICIOUS

Office (OOXML) / .XLSX

599.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-12
MD5: 19031df96c86dc2254dc6903ee52656c SHA-1: 0fe9fb40e06b264d5a4a473a61f59239a11c2649 SHA-256: b121d68b9df8a21a56cd0aee4c7b99272794e68887b37866622e5855cd44c8d4
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/txCOWea0.2wf 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
dba93e88f51fccd0da33f3ae76630985cad89d0261541f236ff81997813572fd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/txCOWea0.2wf 875008 bytes
ooxml_oleobject_00_ole10native_00.bin
516d4142dc0d32596892dac0443eac7a921b4a4e21b58b30c4e3f98b7b7f44d4		 ole-package OOXML xl/embeddings/txCOWea0.2wf Ole10Native stream: OlE10nATIve 865514 bytes

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