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

Static analysis result for SHA-256 6e7711307e375ae3…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: 8ed02650c5b2ef5c3d8371f07b35ba14 SHA-1: a92fe721c05ad58a2e08b5959a05244b032998af SHA-256: 6e7711307e375ae3b7fe5e16da1c3557dbf220be7a66d24160f98e2053105cd9
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The Excel file contains VBA macros that utilize WScript.Shell and CreateObject to download and execute a payload. The script decodes a Base64 string, reconstructs it into an executable file named 'nvidiax.exe' in the temporary directory, and then executes it. This indicates a downloader or droppper functionality. The presence of a Shell() call and WScript.Shell usage strongly suggests the execution of arbitrary code.

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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