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

Static analysis result for SHA-256 5982ec94ca925949…

MALICIOUS

Office (OOXML) / .XLSX

1.99 MB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000
MD5: f1691d8b66a7813dc65d176d20b135b5 SHA-1: de94c0ad66d96bc984d2e7e4724fafac8bf376c7 SHA-256: 5982ec94ca925949147929dfeb27fecd1a6a568a9f87a948555eadab1ef6c365
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate this object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor component. This is a common vector for delivering second-stage malware.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jgLkZ.a7LgJP contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
27419ac9221083dddc450197dbff5d4a6ed4926add3dd82ffe3e9dfc9565a7bf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jgLkZ.a7LgJP 2836992 bytes
ooxml_oleobject_00_ole10native_00.bin
d6aa799063c1f315a5025e87e59eefa4baa4789ef3839e06cfb67fd6a3d8c289		 ole-package OOXML xl/embeddings/jgLkZ.a7LgJP Ole10Native stream: Ole10native 2811923 bytes

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