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

Static analysis result for SHA-256 0d8fdbed57df9891…

MALICIOUS

Office (OOXML) / .XLSX

598.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: 0d7bb55b744e2a0288f435a3906fbf5a SHA-1: bf23fe35a8c6b921db48e8e99946e75f2703bf05 SHA-256: 0d8fdbed57df9891654aed593b5728235eb417aaf1291ff5b06ea266dfb234b6
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is unusually large and carries a payload-like structure, strongly indicating exploitation of a known Equation Editor vulnerability. The embedded object is likely responsible for executing the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wH5c.MUaai5A 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
46d95706ca775f1a6e9b54222dfbf5edb0e18b96e2ea94a500640c5f98977b01		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wH5c.MUaai5A 886272 bytes
ooxml_oleobject_00_ole10native_00.bin
00419cab7c29653460142606bc369f6f160ea6a08f9c58c91017e1c2a421ab91		 ole-package OOXML xl/embeddings/wH5c.MUaai5A Ole10Native stream: OlE10NaTIvE 876732 bytes

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