Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 cf11db423571c8b8…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6b33a4fdd744422016ca47b56239daac SHA-1: 9601d3d6d4f24b6fc0dd44153571c777910f128b SHA-256: cf11db423571c8b846dec88fdf5fb3dce61933c1bd8510927468e5099c79ba0c
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0'. The VBA macros, specifically the Workbook_Open event, use Wscript.Shell to create and execute a batch file located at 'c:\programdata\jledshf.bat'. The script also contains obfuscated strings that reconstruct multiple URLs, which are likely used to download and execute further stages of the malware. The presence of Wscript.Shell and the obfuscated download URLs strongly indicate a downloader functionality typical of the Emotet family.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12041 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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