Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a1b8adceadfdf4d6…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 08a7b7d567d9c4eb7a695054759ee8c1 SHA-1: 7097ebc54f7c538532ccba70fb11136c6bb3d2c7 SHA-256: a1b8adceadfdf4d69ac0a9627777bcd64abb3255edae4e3133247e296c078587
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0'. Static analysis reveals VBA macros, specifically a Workbook_Open auto-execution routine that utilizes CreateObject to instantiate Wscript.Shell. The embedded VBA script contains obfuscated PowerShell commands that attempt to download and execute payloads from multiple URLs. The script also attempts to write a batch file to 'c:\programdata\jledshf.bat' and a VBScript to 'c:\programdata\tghklsd.vbs'.

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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