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

Static analysis result for SHA-256 10d11f1908e1313a…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: 55ddc735d2a42eba601b197894f9a72f SHA-1: 919a5508eda3e0471acd43380551546b57c7497c SHA-256: 10d11f1908e1313a1ce7a8fd52e1dbbd020e2d9a969259eb8a3bd0c507229268
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1059.003 Windows Command and Shell

The VBA script within the Excel file uses WScript.Shell and CreateObject to download and execute a payload. It reconstructs a temporary filename for the payload as 'nvidiax.exe' and attempts to decode a Base64 string from the document's 'Final Offer' sheet, writing it to the temporary file. The script also contains a reference to persistence via a Run key, specifically 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy', indicating an attempt to maintain execution.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
54ba713ab254cfd6176a4b8846c3b0962e2e7a2f34b5c1107ba20bf283bf1595		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7094 bytes

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