Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 fd848a48b867b9a1…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 436f63023db1d56d972233d2349db06c SHA-1: 7fa4221fc7dd3aee1d5dfdbe4ca7ce8ee949180a SHA-256: fd848a48b867b9a183fa1310f2449832d2a23477fb9b210beeb7281979b4aea7
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is a macro-enabled Excel spreadsheet identified as Emotet by ClamAV. The Workbook_Open macro is triggered upon opening, which uses CreateObject to interact with Wscript.Shell. The script attempts to write and execute a VBS file to 'c:\programdata\tjspowj.vbs' and a BAT file to 'c:\programdata\uidpjewl.bat'. The BAT file contains obfuscated commands that appear to download and execute further stages from the provided URLs. The VBA code also contains string concatenation to reconstruct paths and commands, indicating a downloader functionality.

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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