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

Static analysis result for SHA-256 fd1822ed78a7a38f…

MALICIOUS

Office (OOXML) / .XLSX

717.8 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-05-18
MD5: 3bf6bbd09b9c0d99fbe5de6206b24b4b SHA-1: fb572236eaa931f9f2ab291cf1769ca352028367 SHA-256: fd1822ed78a7a38f8d2642bd49ccebc91bfea029abadd1899650e37de8cd90e9
120 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object that carries a payload-like Ole10Native stream. The document body contains a lure instructing the user to 'enable editing' to view the document, a common tactic to bypass macro security. This suggests the embedded object is intended to be executed upon enabling macros, likely to download and execute a second-stage payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WWf3o.2kUNGC4 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
7c69cf5a0318d6cea47b71dc76f90fa26f9565810cf12beecd461009abb6c72b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WWf3o.2kUNGC4 1059328 bytes
ooxml_oleobject_00_ole10native_00.bin
91e61fe7573c2f21409ba0d4c7bbbbfc4673509408ce753f6974676be85ad899		 ole-package OOXML xl/embeddings/WWf3o.2kUNGC4 Ole10Native stream: oLe10naTIVe 1048397 bytes

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