Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ea3ad3058ea3658c…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 4cfa7d971ff8011c462c1d6e307c7561 SHA-1: 82f088bd3170e53c2a93232d0e7e01d49a300b38 SHA-256: ea3ad3058ea3658cae46a7b80207d6335f1fc830b7baea802b856080468265b7
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1204.002 Malicious File T1071.001 Web Protocols

The file contains VBA macros, specifically a Workbook_Open event, which is a common technique for Emotet. The script uses CreateObject to interact with Wscript.Shell, indicating it will execute commands. The DOC BODY and script content reveal attempts to download and execute further payloads via VBS and BAT files, with multiple URLs identified as potential download sources. The script also contains obfuscated strings that reconstruct URLs, such as 'http://youlanda.org/eln-image/n8DPZISf/', which are included as IOCs.

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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