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

Static analysis result for SHA-256 d2f3089adedb6fa8…

MALICIOUS

Office (OOXML) / .XLSX

622.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-06
MD5: 2aee2d0eb00696816acb73ae7532fde5 SHA-1: 0bdc9853fccb04df4fe1253fe7f5e6ddf141321b SHA-256: d2f3089adedb6fa83b6584307bb7db95117896880d2fd05ce18c13aa4a1fa710
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies in its Ole10Native stream, indicating it carries a payload. The presence of an Equation Editor exploit suggests a delivery mechanism aimed at exploiting known vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8blU.Z0Urlkc 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
f4843003070e9089d68dfb9803f628019e4fa429f1190fc1c6b0dae25338c472		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8blU.Z0Urlkc 930816 bytes
ooxml_oleobject_00_ole10native_00.bin
ea7c811d97ff7845b08907118a0dd1a45cb71cb13ed8c714960ceafc64f36ed8		 ole-package OOXML xl/embeddings/8blU.Z0Urlkc Ole10Native stream: oLE10NatIvE 920651 bytes

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