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

Static analysis result for SHA-256 298e00b48193ec03…

MALICIOUS

Office (OLE) / .XLS

409.0 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: 214ffc12326477dd7e587980696f715b SHA-1: 31032273d6a1608516db7664d004a1a5c79676a0 SHA-256: 298e00b48193ec036a82bed7917b862da16b24bfa06cc3d3cd666792db84912a
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The sample is a macro-enabled Excel file that contains VBA code. This code uses `WScript.Shell` and `CreateObject` to decode a Base64 encoded string found within the document's cells. The decoded content is written to a temporary executable file named 'nvidiax.exe' and then executed. The document body appears to be a form for entering personal information, likely a lure to encourage macro 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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