Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 c7d8391d02ef5e19…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8551a47b49e3e457ca97279c3d669387 SHA-1: 72dc7fbcc8b9607b61539f8d175da5969f0573d5 SHA-256: c7d8391d02ef5e19178493eb4ac85959a9ecfa00732f02503a7c0ee572269b48
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell 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 VBA macros, specifically the Workbook_Open event, are designed to execute code using CreateObject and Wscript.Shell. The script attempts to download and execute a second-stage payload from multiple URLs, including reconstructed URLs like 'http://lbsbriefs.com/cgi/2kl8X826xEuhUI/'. It also creates a batch file at 'c:\programdata\uidpjewl.bat' which contains obfuscated commands, likely for further execution or payload staging.

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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