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

Static analysis result for SHA-256 5e38b3641a8fa136…

MALICIOUS

Office (OOXML) / .XLSX

685.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16
MD5: 42957d0c8fad6659b231d29ed12ff027 SHA-1: 4492398fd8d550ba3350cbc6a30b6ac93323ecab SHA-256: 5e38b3641a8fa13693438ee8b9fc331b8d5e25c4210f814dee6c273146f6581d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Office Open XML spreadsheet 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 being used for exploitation. This points to an attack pattern leveraging the Equation Editor vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8cvu.4clSf5 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
8d38242d325c6b232efeeac96418207e33326459b83bfdba6ce8f864117d7255		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8cvu.4clSf5 942080 bytes
ooxml_oleobject_00_ole10native_00.bin
aa4ac5303e46bc3ca3fe4ab7195d8ced8d7458e951330fba890e785dec92d13f		 ole-package OOXML xl/embeddings/8cvu.4clSf5 Ole10Native stream: OLe10nAtIve 932090 bytes

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