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

Static analysis result for SHA-256 30cb3ae593379ce4…

MALICIOUS

Office (OOXML) / .XLSX

715.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 6579670bfc471264b8aa1572ee0e25ea SHA-1: 58ab925d8cd626a5c59e2aaf08644f860a4844d7 SHA-256: 30cb3ae593379ce4277572d619a27c40d812baf786f52d5ec2ff42f572bea7cc
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the file is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WxvqYIu.dhzNKM6 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
d0cb6f0a7cf6ee05ce09c9b22542f149d95c25a0fcb2c61f554b2b6daa17c033		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WxvqYIu.dhzNKM6 962560 bytes
ooxml_oleobject_00_ole10native_00.bin
e0c450b5b8a961f4a54ccc66c5acbfc8455062ee18de32be1d812c0df29f836b		 ole-package OOXML xl/embeddings/WxvqYIu.dhzNKM6 Ole10Native stream: oLe10nATiVE 952510 bytes

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