Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 490b08899d1f59ae…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 50a450e8a1ad60b0e4338c11e02aaa84 SHA-1: ac09fd47c70023cfeb141295b8236b93e218a807 SHA-256: 490b08899d1f59aee647a3732008d957526a91cbdca16035d2af5a4b196e24b9
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0. Static analysis reveals VBA macros, specifically a Workbook_Open auto-execution routine that uses CreateObject and references Windows Script Host. The extracted DOC BODY contains obfuscated commands that appear to be constructing a batch file and downloading payloads from multiple URLs. The VBA script itself contains a MsgBox prompt and further obfuscated code, suggesting it's designed to execute further stages of the attack. The reconstructed URL string is: "http://youlanda.org/eln-image/n8DPZISF/ ,http://roservideob.net/eln-images/EjdcCoMLY8Gy/ ,http://vbaint.com/eln-images/H2pPgtE8XzEN C/,http://framemakers.us/eln-images/U5W2IGe9m8i9r/,http://niplaw.com/asoliodoun/ ,http://roberflolod.us/eln-images/DGI2YOkwSc9XPO/,http://mpmcomputing.com/fonts/JO5/,http://roberflolod.us/eln-images/DGI2YOkwSc9XPO/". This indicates a downloader pattern typical of Emotet.

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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