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

Static analysis result for SHA-256 cead05332088145a…

MALICIOUS

Office (OOXML) / .XLSX

180.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: fa56c40bb6eb9bb4117e85fbf3a0f99d SHA-1: 4eebf60a95900d5766f296e5b3515a8fc52cf573 SHA-256: cead05332088145adcd624766cf8af47da5fef181bb3a851322b9c085ca58b59
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The presence of a hidden sheet further suggests an attempt to conceal malicious activity. No scripts were extracted, but the embedded OLE object is the primary vector for attack.

Heuristics 4

  • 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
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c6208290f9582331d97d92032bb9e70acb20bebd88145a24056e489419136180		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
9160b1dd4eecfedec66a6eac4adb7c46a9ceae4bf8cd896e116d3f5f9839cfac		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NATIVE 1690 bytes
emf_00.emf
b1184dd26ae8c032ba0df9fd2c6fdc2020d7fe9d91306963c81454bca9a7cb8d		 ooxml-emf OOXML EMF part: xl/media/image7.emf 498420 bytes

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