Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 96536d173df92bad…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 5d3a461e3cd0b4933951e248b1182f1d SHA-1: 37c8066e4b38c53a994aefc2803f25321b519ecf SHA-256: 96536d173df92badb1bb555a4e2d0b7498500339934d1a4a72cd26fa859c72f3
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical ClamAV heuristic and high-severity VBA heuristics indicate this is a malicious downloader. The Workbook_Open macro automatically executes upon opening the document. The script reconstructs a URL from concatenated strings: 'http://midnighsilvercrafters.com/store/wBjNOUw/B710N4cQA6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/', which are used to download and execute a second-stage payload. The script also attempts to save a VBS file to 'c:\programdata\oue4hjld.vbs' and a BAT file to 'c:\programdata\bhnasleil.bat'.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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
41ae78b4e523f3b7530d75728053f13e02ac4d01b53e49430d516df5e9dc2c09		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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