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

Static analysis result for SHA-256 c8a3afbe993a8c46…

MALICIOUS

Office (OLE) / .XLSX

102.5 KB Created: 2022-09-21 06:41:05 Authoring application: Microsoft Excel First seen: 2022-09-21
MD5: 4801317e331435ac031fe4d5bda0e668 SHA-1: 0683bc3b43f8d2d5bd371afaa91a572a686a2605 SHA-256: c8a3afbe993a8c462856e72256e1ec0a251777a5d5bc6cac978e4349f8cb9ac2
440 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The VBA macro utilizes Auto_Open to execute code that leverages WScript.Shell and CreateObject to download a file from 'http://exe.QFR/642.491.3.291//' and save it as '%Temp%\WinUpdate.exe'. The presence of certutil references suggests potential decoding or execution of the downloaded payload. This indicates a downloader or droppper functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3e42a6f480d83cc759bd08e0723b1da7165d55a64802d1dc425711d8d90b2583		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5047 bytes

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