Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 100d4cdf90414a50…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a7f440ea0fc69a13e6ad769dd2e945c4 SHA-1: da06a60dedfaaf3864c957de7c740b536e2f573d SHA-256: 100d4cdf90414a50d7c0705c87fe2e79df47d9aff767b376399c7187ae02d65f
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for Emotet. The macro attempts to execute a batch file located at 'c:\programdata\jledshf.bat' using Wscript.Shell. The embedded script also contains obfuscated URLs that are likely used to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' further supports the Emotet family attribution and downloader functionality.

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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