Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 f44f1b10d2a9d5b1…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 53eaa2ad1f927edcb31f0640be749012 SHA-1: fb2fab77c05eeea129b5abab684925482dc7690b SHA-256: f44f1b10d2a9d5b16ee72434140f4593fe0f96b1a0e947837bbd0327c0c92f54
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for Emotet. The script utilizes 'CreateObject("Wscript.Shell")' to execute commands. It reconstructs and executes a batch file located at 'c:\programdata\jledshf.bat' and also attempts to download a second-stage payload from a series of concatenated URLs, including 'http://monequoutal.ja.deals/assets/jcWxvUSpE7VhWxj/'. The presence of 'Wscript.Shell' and the execution of external files strongly indicate a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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
c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5709 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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