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

Static analysis result for SHA-256 e5ffbcedb524a1f2…

MALICIOUS

Office (OLE) / .XLS

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01
MD5: bf3c8ad076e0507ed5e3a90360cc35a2 SHA-1: 1041dde82e726d3b64ba2a61127bead5a666009a SHA-256: e5ffbcedb524a1f2202bb4d9aed10d1dcf97e033b56b23cb3d9896bc194501b1
228 Risk Score

Malware Insights

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

The sample is a macro-enabled Excel file containing VBA code that utilizes WScript.Shell to execute commands. The script decodes a Base64 string, reconstructs it into an executable file named 'nvidiax.exe' in the user's temporary directory, and then attempts to establish persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'. The document body, though partially in Persian, appears to be a form for submitting personal and financial details, suggesting a phishing or scam lure.

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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