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

Static analysis result for SHA-256 a5f9e311fc6beb13…

MALICIOUS

Office (OOXML) / .XLSX

672.0 KB Created: 1998-10-02 13:17:16 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-05-19
MD5: a203d52471287c0decf96b4fc1a59240 SHA-1: fdd4cf62dc62b18e79fbd440e9de53286834423d SHA-256: a5f9e311fc6beb139fa99c553c940bf8f1c8fd77a9cb5cfad6b98870bd8e86a6
120 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like stream with an anomalous header, suggesting it's designed to exploit vulnerabilities. The presence of an external relationship further supports the likelihood of malicious intent.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8SWs17.X2JiU 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.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: /CAMI/Cotizador Crouse-Hinds Ver34.xlsm
  • 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
168edd209b3fa386fe083fe16bbd55aff548c3124edd81d609b8f251740af3e4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8SWs17.X2JiU 873984 bytes
ooxml_oleobject_00_ole10native_00.bin
d8e6b8c293ad05ea06b7ea8541d28d4f5c1904a91c700eef5991cfab13e6d790		 ole-package OOXML xl/embeddings/8SWs17.X2JiU Ole10Native stream: OLe10natIvE 864377 bytes

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