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

Static analysis result for SHA-256 61d7392209cac0f0…

MALICIOUS

Office (OOXML) / .XLSX

753.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-27
MD5: b42c7bfa7948517ac1e1b65aa354146d SHA-1: 0ccab796ab2d854c7f160845498b5ae412cfc60c SHA-256: 61d7392209cac0f0aeeecc5251695153bd0304c64e2ea93173b152d5eb5f10f4
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically an 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 being used to deliver a secondary exploit or payload. The document body contains what appears to be an invoice with product details and shipping information, likely a lure to disguise the malicious nature of the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3WfUO3.j2E 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
8962bcc06161d151c7f273b74939820ac0a43084af788db486bc99400d1f7b80		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3WfUO3.j2E 1017344 bytes
ooxml_oleobject_00_ole10native_00.bin
5acd05cf2e013e1a429ddd6cf8c08d57733974c7c2a3882918a487fa13959e75		 ole-package OOXML xl/embeddings/3WfUO3.j2E Ole10Native stream: OLE10native 1006915 bytes

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