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

Static analysis result for SHA-256 54fcd3b5837fb591…

MALICIOUS

Office (OOXML) / .XLSX

705.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-08
MD5: 358e1eb408ec1f66e139c4fbac0fc439 SHA-1: 5a964c9ea84157c3763b5bd9f4e34daa74c4dc90 SHA-256: 54fcd3b5837fb59165f93b9476c2593292deaf5c75b4fea76fa8001df3427e1c
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 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 size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary indicator of malicious intent, likely serving to download and execute a secondary stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7ij2.zNyq 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
b3ab47d208b32556955fe55f5d5b646c8fa8976c2939dbddd5459daa4a2e781e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7ij2.zNyq 1030144 bytes
ooxml_oleobject_00_ole10native_00.bin
4d6533c5a1da7d9966a55e61bab6d8264ac487bb9d3b27cc450e4e5e0fb64d71		 ole-package OOXML xl/embeddings/7ij2.zNyq Ole10Native stream: ole10NatIve 1019812 bytes

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