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

Static analysis result for SHA-256 3ba488987cc2acd9…

MALICIOUS

Office (OOXML) / .XLSX

709.6 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 37759d505c614f82bf436079823a1b33 SHA-1: 4c78cfe78b3586244cdbf63f75e934c096edb56f SHA-256: 3ba488987cc2acd9bf520ebe5d7d4a24ca1f0e4663e16bed19f9de1405fdce6a
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is unusually large and has high entropy, strongly suggesting it carries a malicious payload. The presence of an embedded Equation Editor object is a known technique for exploiting vulnerabilities like CVE-2017-11882, which allows for arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5NGFYI.yyT6o6 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
54b11dd32a4f498632e9ace18cd797d6e17b4520f9f27582bfca6ad7250e3d5b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5NGFYI.yyT6o6 972800 bytes
ooxml_oleobject_00_ole10native_00.bin
1f9f2797b40a54b40788052bb1d3c9bedaff71c45dac4d56c3f6a355256bada8		 ole-package OOXML xl/embeddings/5NGFYI.yyT6o6 Ole10Native stream: OlE10NAtIVe 962874 bytes

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