Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 0e173f0615ab011d…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 859f8738da9ef0a9667a473ae8b2f0ac SHA-1: 6e2946fca0fdf4fd266e88f7c93759a77529908a SHA-256: 0e173f0615ab011dd1a978a6a4822c8990b202aa0019cb55eae6265665295f23
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 Emotet infection vector. The macros attempt to create a Wscript.Shell object and execute a batch file (`uidpjewl.bat`) which in turn downloads and executes a VBScript payload (`tjspowj.vbs`) from multiple URLs. The batch file's command line is heavily obfuscated but appears to be constructing a PowerShell command to download and execute content. The ClamAV detection name also strongly suggests Emotet.

Heuristics 6

  • 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.
  • 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

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