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

Static analysis result for SHA-256 9db18ffe6271289f…

MALICIOUS

Office (OOXML) / .XLSX

626.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 71d9c2ccce9329ab512ad1e1c90a4685 SHA-1: 43dd45bef2e463968bc8f7502e4f7a31e72040d3 SHA-256: 9db18ffe6271289faa0f5b48737b70abeea7b8ade16c29d224ee7d859db5974a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an OOXML file 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 size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This mechanism is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/17.6VxG 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
06e9c5957fc99cb0c0f5c532c1f65fd09bfa4fbf43a640a147745d0f3968a1f0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/17.6VxG 916480 bytes
ooxml_oleobject_00_ole10native_00.bin
635f441bd685ace5168e87ab4df1977a7ff8a5444a835982c0db00606c46f06f		 ole-package OOXML xl/embeddings/17.6VxG Ole10Native stream: OlE10NatIVE 907041 bytes

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