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

Static analysis result for SHA-256 337f3864fea2c109…

MALICIOUS

Office (OOXML) / .XLSX

1.08 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-06-23
MD5: 951d3296785275572815fc35066f864c SHA-1: 63865c0c716c6f8cd9abfc4b7ea4b526b9f9e9fc SHA-256: 337f3864fea2c1094e73c9b7db31401a438f29fbd198b8d999e9b0362f3ff2f1
140 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded OLE object is the primary mechanism for delivering the malicious payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xLgo.ncTpC contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
f4b01891fcf1fdb478dfce5b7d7d0db23a58670b30a5769570c9f8f84909c163		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xLgo.ncTpC 1463296 bytes
ooxml_oleobject_00_ole10native_00.bin
ebf7bb7489889230cdceab5fc1600efb7a3ac3ae8cb7fe68a9b77e479899f1f1		 ole-package OOXML xl/embeddings/xLgo.ncTpC Ole10Native stream: Ole10Native 1449365 bytes

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