Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 28ba4abb428f49b0…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 651bcd04fd6efadac68c171d100d72df SHA-1: 30b8ebf1a9abb21e2c7d6e7039e3de3d88fa5f13 SHA-256: 28ba4abb428f49b08c4222c88bc8deefc3cede8ff0a414ab1bdb6e1a98b5ac4a
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that executes a Windows Script Host (Wscript.Shell) object. This macro is designed to create and execute a VBScript file (`c:\programdata\tjspowj.vbs`) and a batch file (`c:\programdata\uidpjewl.bat`). The batch file contains obfuscated commands that appear to download and execute payloads from multiple URLs. The ClamAV detection as 'Xls.Downloader.Emotet' strongly suggests the Emotet family, known for its downloader capabilities.

Heuristics 7

  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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