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

Static analysis result for SHA-256 e1f6259ebcf3161e…

MALICIOUS

Office (OOXML) / .XLSX

652.9 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: 2a05509087305bb7680133d41b262e79 SHA-1: d624cfb366e775195d0cb305cb5c75ae1b43ed0b SHA-256: e1f6259ebcf3161ebc659e3bac4b8df76fd1b0b855b0b61860555c042244fb60
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 header and size discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body content appears to be tabular data, likely a lure, while the embedded object is the primary vector for malicious activity.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ep.TiQ 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
fd9db146a6b7dce9e33209f29e466dbde128959334e2ef4de925102302381cc2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ep.TiQ 935424 bytes
ooxml_oleobject_00_ole10native_00.bin
22516643d025b8b89f2f6353c35ac1c74689a1ec085134e9ce2205fcb3113e68		 ole-package OOXML xl/embeddings/Ep.TiQ Ole10Native stream: oLe10naTiVE 925320 bytes

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