Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 2699f2752209d532…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 572f9577e56f5842896cbb44229d2e80 SHA-1: 9a0334b5515d3ecd241fcff6b49b308d0b1a7d0c SHA-256: 2699f2752209d532d762da1edbd42da39fbc5403a06ce486fa558c2f81e3cfa7
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The file is a macro-enabled Excel spreadsheet identified by ClamAV as Emotet. The Workbook_Open macro is configured to execute a command that creates and runs a batch file and a VBScript. The VBScript appears to be responsible for downloading a second-stage payload from the reconstructed URL 'http://midnighsilvercraft.com/store/wBjNOUwc/B110N4cA6R3/'. The presence of Emotet heuristics and the observed download mechanism strongly indicate a malicious downloader.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
c3b438f1c2659c5801856eb1cc39bd25737a0b189ba62a2d4cac99decd6a0613		 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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