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

Static analysis result for SHA-256 fb12a393e8260ef0…

MALICIOUS

Office (OLE) / .XLSX

1.21 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e79caec024d0abddc288e30c2c974945 SHA-1: 2e56b64b76874ae950f7d71b115fff184e0b33f3 SHA-256: fb12a393e8260ef0e83bb670f86e19ce598b14bb9bbb8f90d27b573a310180f5
68 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates exploitation of CVE-2017-0199, which is a known vulnerability used to download and execute remote content. The extracted URL is highly suspicious and likely serves as the source for the secondary payload. Although the VBA project contains no executable statements, the OLE structure itself is weaponized.

Heuristics 2

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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