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

Static analysis result for SHA-256 d5b82a2826020067…

MALICIOUS

Office (OOXML) / .XLSX

9.9 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-26
MD5: 90aa8a022467a94aeecf99157e8e419d SHA-1: 4f10b7bcb19f7daa4bb9d5accf6b763abb897b44 SHA-256: d5b82a28260200679d54ce37404793766ef9b94a93216219351de41755b4bbc1
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous native stream within the Equation Editor object. The presence of this object strongly suggests an attempt to exploit this vulnerability to deliver a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
b6a194d4ef719c7a57b5cd73c6d32829a72aa04bbbaf113e9362a113b830480f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
9c773f2d599024b1443aba22e128097909c3298d75e5a5b377707a0a633a4891		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NATIVe 1730 bytes

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