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

Static analysis result for SHA-256 dd6f99acee197c47…

MALICIOUS

Office (OOXML) / .XLSX

720.1 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-30
MD5: f430e73d240bc92f3b278ec36cf14e32 SHA-1: 21cfa78c22db6a471a2cc99aa7529616bf1f6f2c SHA-256: dd6f99acee197c471adccba83a0b0a313f3c3640dbde651233680378dd50f363
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used as an exploit vector. The document body contains what appears to be a parts list in Afrikaans, which may serve as a lure. The presence of the embedded OLE object and its anomalous Ole10Native stream strongly indicates an attempt to exploit vulnerabilities within the Equation Editor to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oy.jx 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
374f7d839f4dfce5dec32e30e9f8ae94c050a64206086cc5eb0bd012c5b0790b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oy.jx 1065472 bytes
ooxml_oleobject_00_ole10native_00.bin
9575ad444ace6c6489dda60dc5cf9264806047ee1a441cc4a7b64507276c1154		 ole-package OOXML xl/embeddings/oy.jx Ole10Native stream: oLE10natIVE 1054589 bytes

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