Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 570f8dc4af9cfab0…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: b05f4cb51377bed576d82bf8b412621c SHA-1: 657256871334b3e1f81ac72a49295beaa81b093d SHA-256: 570f8dc4af9cfab054e5aff5204ebcf5edabc0d161694374086a55246942fb69
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 routine. The macro is designed to download and execute a second-stage payload from a hardcoded URL. The ClamAV detection explicitly names this as an Emotet variant. The script attempts to download a VBS file from 'http://midnighsilverbcraft.com/store/wBjNOUw/NA TE_05_22_2009/BI710N4cQA6R3/' and a BAT file from 'http://tempra.com/NATE_05_22_2009/BI710N4cQA6R3/', saving them to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat' respectively. The script also contains a reconstructed URL 'https://redington.karmaat' which is likely part of the download chain.

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
3119b88368af1728bcfbbabcfb51d5c3e87b4c00bdf8d9a019f3d05d9ba10789		 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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