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

Static analysis result for SHA-256 2ff381e6ecaa137d…

MALICIOUS

Office (OOXML) / .XLSX

658.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-04-26
MD5: 93087b964bfe4b917691f5777ddb73ce SHA-1: df4195cde207289a11fcdc1bbd1713a94a15e702 SHA-256: 2ff381e6ecaa137dc5e08e90bd58d77936dbc3dd191cb2629c6d021ffee4e78e
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor component. The embedded object is the primary indicator of malicious activity, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dAMblEwcb.xcmZ 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
30e32ad869dd3bf0b02731bf5cae2379644906d0cd251f78de03250317eadcff		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dAMblEwcb.xcmZ 894976 bytes
ooxml_oleobject_00_ole10native_00.bin
f6b310f57b81b3ac4b98b19e473dee23ac13e1874a978352cf62718def5ef315		 ole-package OOXML xl/embeddings/dAMblEwcb.xcmZ Ole10Native stream: olE10NAtive 885256 bytes

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