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

Static analysis result for SHA-256 466fa28002cbf5aa…

MALICIOUS

Office (OOXML) / .XLSX

720.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-27
MD5: 41fa26d84f2b4aaaa11c2c2966a24ee2 SHA-1: 7268817878c0667ce8eebad6036e7d6f97a413b5 SHA-256: 466fa28002cbf5aaec5e9a0aa06dad6c8795d20ae0a622add4c0f8747875505b
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The document body presents a fabricated invoice, likely a lure to trick users into opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1tkgcwJFT.xN 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
d57feaa9bfd9ff473a05ccacfad637ce9e25cbd7492bb738125be837363190b6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1tkgcwJFT.xN 1029632 bytes
ooxml_oleobject_00_ole10native_00.bin
02b74b8d25d6f0aafeab6c87f318eaa3eacb032547f9a20c7b5b1a282a88c344		 ole-package OOXML xl/embeddings/1tkgcwJFT.xN Ole10Native stream: OlE10nAtivE 1019378 bytes

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