Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 8956155000489ab6…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 49ef82972e030421fcab6e18a38a3ce1 SHA-1: 499338098f97679e27d1ae7d4cbcbc9e5103e33d SHA-256: 8956155000489ab6e93bd959e1ace5690a9a86903ba06a4e64c0ff92912b37b0
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1547.001 Registry Run Keys / Startup Folder T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that executes a batch script located at 'c:\programdata\uidpjewl.bat'. This batch script contains obfuscated commands that appear to download and execute payloads from multiple URLs, including 'http://youlandda.org/eln-image/n8DPZISf/'. The presence of Wscript.Shell and CreateObject calls, along with the ClamAV detection as 'Xls.Downloader.Emotet', strongly suggests Emotet activity. The macro also attempts to create a VBScript file at 'c:\programdata\tjspowj.vbs'.

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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