Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 eef4fc619198af92…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 86875bcb728bd1ffa85bf6200710e10f SHA-1: 019449fcd367a4909387683218a25c25abf73c18 SHA-256: eef4fc619198af9239f2c0d0c8571ff55f43ee56a1995625597cb299d33d6177
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script utilizes CreateObject and Wscript.Shell, indicating it's designed to execute commands. The obfuscated batch commands and VBScript paths suggest the primary intent is to download and execute a second-stage payload from one of the listed URLs. The ClamAV detection further supports the Emotet family attribution.

Heuristics 7

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 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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