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

Static analysis result for SHA-256 8c15a8c2b5d83747…

MALICIOUS

Office (OOXML) / .XLSX

708.6 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-20
MD5: ae0f35d5292498526ed57830eed8b6d2 SHA-1: 94eeeb2ecd6a46e6f1b3e1695b4f549d153b847e SHA-256: 8c15a8c2b5d83747a09840de8db4a5836121eb7e1fddaee1f1529e8d82737734
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The XLSX file contains an embedded OLE object identified as an Equation Editor. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's a dropper for a secondary malicious component. The presence of this specific type of embedded object is a common technique for delivering malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/unz5DBA.84s 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
249128016f224b2e33ce5dd5243b47f7c40bee78a523f755e4c5fdda3fbebf8d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/unz5DBA.84s 979968 bytes
ooxml_oleobject_00_ole10native_00.bin
c509f6890a50df61091d2eabad1fa66fec1fbf67404f646f0c2a835ea0675f4a		 ole-package OOXML xl/embeddings/unz5DBA.84s Ole10Native stream: Ole10NAtIvE 969928 bytes

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