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

Static analysis result for SHA-256 0baaf8734ae56f4c…

MALICIOUS

Office (OOXML) / .XLSX

593.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25
MD5: 551cf95aad7260921cad77ed8e1bd9a7 SHA-1: dfe5524222cb7e85bd74393913e838abb2848817 SHA-256: 0baaf8734ae56f4c4c20fd020875cb1e5daa6bd7e0e0d8e4bc26dc4382d6f14e
100 Risk Score

Malware Insights

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

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 and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This indicates the file is designed to exploit a vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WTC.u9 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
df0fec1972f93564d9fd2747732bc5f43df382e6cdf453e105dd363e83fb6c8d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WTC.u9 857600 bytes
ooxml_oleobject_00_ole10native_00.bin
939c11848b9cf0f59a0db80b79388ae8a55fc47080f9c8ac4fe3b55dad195e38		 ole-package OOXML xl/embeddings/WTC.u9 Ole10Native stream: OlE10NaTIVE 847943 bytes

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