Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 445eb813ab88e7cc…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 7388da65bdd0419d131afbc791cc4537 SHA-1: 45ad797e532b7dcf179e0d613b43146641d202ee SHA-256: 445eb813ab88e7ccd00283015d4be67ac31c8da55316b7b4280022ff70fea157
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open auto-execution macro. The script attempts to download and execute a second-stage payload from the URLs 'http://midnighsilverbcrqfter.com/store/wBjNOUw/B1710N4cQA6R3/' and 'https://redington.karmaat'. It also creates two files, 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat', likely for execution. The ClamAV detection explicitly names this as Emotet.

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
e04a1c0eb05f3302523c0a55c1ab379fab027735e645c3d6e9f266026a5f8a5c		 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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