Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 7711dd6739de17e0…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 1505ed7c531ce34fc34d98a96dc357cb SHA-1: 3b3faacc90f25d69784af456c547273ef2d7f378 SHA-256: 7711dd6739de17e02b83842715abebf5fb43906a66ab71f6d499b0b260f3f820
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Workbook_Open event, which is a common technique for Emotet. The script uses CreateObject("Wscript.Shell") to execute obfuscated commands. These commands attempt to create a batch file at 'c:\programdata\jledshf.bat' and then execute it. The batch file content is heavily obfuscated but appears to be downloading and executing further payloads from several suspicious URLs. The ClamAV detection name also strongly suggests Emotet.

Heuristics 6

  • 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.
  • 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

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