Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 6e58d150a297df88…

MALICIOUS

Office (OLE) / .XLSX

133.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e134f786bbaccb093fb76a0d4dadaf16 SHA-1: f9b4ee6daaf2fc2890906883a2cb89a291189dca SHA-256: 6e58d150a297df88f8cb317b30c3e41c29b4ae6aeef2604890bd78188640ba64
340 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file contains a Workbook_Open macro that is heavily obfuscated and uses CreateObject to execute code. Heuristics indicate it references PowerShell and Windows Script Host, and ClamAV identifies it as an Emotet downloader. The macro attempts to download and execute a second-stage payload from a list of URLs, including 'http://afieeti.com/b/MzLJFqjFbw'.

Heuristics 8

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • 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
2371f091b169c7918c945b8974b3f60437212f84d1a9d429701826689481f8d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6376 bytes

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