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

Static analysis result for SHA-256 240db31fca0f94f8…

MALICIOUS

Office (OOXML) / .XLSX

617.7 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-11
MD5: ad305741c0274f5e03b82e3064f734ca SHA-1: 503def7a04cff86b7e2aedc69cdfe8c02b7e3a6f SHA-256: 240db31fca0f94f85b17fe7d3ab4096acc1f7d7902e0d8ef8bec91cb4600eb81
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit vulnerabilities. The document body, appearing as a purchase order or shipping manifest, serves as a lure to trick users into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FQcF.RB08 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
5ad8b03c16ec6f23273c5a799c4308e1cdb8e5fd5904bd3659708f6e46ffc3ee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FQcF.RB08 893440 bytes
ooxml_oleobject_00_ole10native_00.bin
d51c20fe21411eeb16f7044d9844b7b8af136dd89671375d5444a99d82ee02a9		 ole-package OOXML xl/embeddings/FQcF.RB08 Ole10Native stream: Ole10NAtive 884206 bytes

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