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

Static analysis result for SHA-256 34ea170c561be142…

MALICIOUS

Office (OOXML) / .XLSX

610.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-04
MD5: 2bd8b24f6db584b9513597e178fe8bbc SHA-1: 4a6d8dae5bd7a46f75fef0fffe9317f8baf570fe SHA-256: 34ea170c561be14224efcfebc3027fedbbed80b08a92e56781971cb85bf05153
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to an attack pattern focused on exploiting the Equation Editor component to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/flCnkQi.fxRBp 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
b7c956ed491f08f7800cf007e3d90636e197d8ad06964a66101d8b78d2ed467b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/flCnkQi.fxRBp 897536 bytes
ooxml_oleobject_00_ole10native_00.bin
cc1d4c1724f2c0677aca4215776f1d201f70b998ed8c4d2d164057834e972057		 ole-package OOXML xl/embeddings/flCnkQi.fxRBp Ole10Native stream: oLE10NAtIVE 888030 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.