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

Static analysis result for SHA-256 c6ee0aade2f5bd6a…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: 74a58517065bebca11c946428db13ba5 SHA-1: e63870a155625aebc1c4f836d459fb920c7fc0be SHA-256: c6ee0aade2f5bd6adf62e28d5cc174f6281e6812fcaf4378ba33a25dc8dc002c
228 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information T1036 Masquerading

The Excel file contains VBA macros that utilize WScript.Shell and CreateObject to execute code. The script decodes a Base64 string, which is likely a second-stage payload, and saves it as 'nvidiax.exe' in the user's temporary directory. The document body appears to be a form for entering information, potentially a lure for financial fraud or credential theft.

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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