Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 cc9da9a853931a45…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6532e3fce76dd92835205dbc70702f0b SHA-1: 77c135a9076f2b63be8264c58ae4b4d28ed16f49 SHA-256: cc9da9a853931a45e8d46f10a79e0fd830ce24b5d246c67b8f4d1dcfd3c38dd9
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that is automatically executed. The script uses CreateObject to interact with Wscript.Shell and RDS.DataSpace, indicating it's designed to download and execute further payloads. The DOC BODY contains obfuscated commands that reconstruct the URL 'http://aliveystem.com/eln-images/pm2rSNVM/' and 'http://don-le.com/notes/U6H1', and also references the creation of a VBS file at 'c:\programdata\tjspowj.vbs' and a BAT file at 'c:\programdata\uidpjewl.bat'. The ClamAV detection explicitly names this as an Emotet variant.

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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