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

Static analysis result for SHA-256 3bc432cd2287ad90…

MALICIOUS

Office (OOXML) / .XLSX

601.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-04
MD5: 06f1886c42596a641e297974234fd7d1 SHA-1: 98473fd28cd1c357eb7dd66518a9af32493acedc SHA-256: 3bc432cd2287ad900357524406e87e7082fa34ac8b0728f086705ed2071905b8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely to execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/CMiZwu0Fc.Wcu8 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
b40e0291907aa66b3321918c6540de17441159fa1b3bd09d515b95cd4a80b401		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/CMiZwu0Fc.Wcu8 868864 bytes
ooxml_oleobject_00_ole10native_00.bin
50fab902deb3b9bd31b3bde46223491dd7bcde8157883feedbaacbb9aecd1d7f		 ole-package OOXML xl/embeddings/CMiZwu0Fc.Wcu8 Ole10Native stream: Ole10nATIve 859418 bytes

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