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

Static analysis result for SHA-256 ad12f842b38f8d89…

MALICIOUS

Office (OOXML) / .XLSX

639.9 KB Created: 2023-09-13 22:46:27 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: 1a9ef690c6f65c6495775e7ba9787386 SHA-1: 17415c70c833f8431147fbdb72215fa4eb1711b0 SHA-256: ad12f842b38f8d898b10713b3cb29cfaa390ba1f3658825d31512c257de691c0
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries an anomalous Ole10Native stream, suggesting it contains a malicious payload. This is a common technique for exploiting vulnerabilities like CVE-2017-11882 to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8GQDG.XlC0w2 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
e1c3cb310184515c1abdb4835dece1f591a94037102abc917956acc04c1a36f6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8GQDG.XlC0w2 896000 bytes
ooxml_oleobject_00_ole10native_00.bin
a58b32637c7822ee061f75bef1dc379cb5a42be7fe10bca95dd7e33b75daabec		 ole-package OOXML xl/embeddings/8GQDG.XlC0w2 Ole10Native stream: Ole10naTivE 886627 bytes

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