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

Static analysis result for SHA-256 5ce03f2298e57689…

MALICIOUS

Office (OOXML) / .XLSX

703.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-08
MD5: e0239f478f6dcfb67f2a3621fc19210f SHA-1: 8de8d5476092b8e12be0a1c359f57fdab86cbe98 SHA-256: 5ce03f2298e576893f28d9df7b257db389f0f630768b373790b0b3b26e9bc5d7
140 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate this object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a known vulnerability. The presence of a NOP sled further supports the likelihood of shellcode execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fp.j0dZ 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
db24c32368f913fb366eb2d6feafd934e161bf5ca13620443d7fc2cdc08bc5ee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fp.j0dZ 986112 bytes
ooxml_oleobject_00_ole10native_00.bin
2e0cce8faf443bd67a6091d616c5f0814e82e8940cc9746f8d1424e8efb61500		 ole-package OOXML xl/embeddings/fp.j0dZ Ole10Native stream: Ole10native 975475 bytes

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