Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 857edde3416f3b9e…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 2005101935f84225b46c46f4d99b359c SHA-1: 54cfef00b8b46d2dce9d7de803afe9f55f87e447 SHA-256: 857edde3416f3b9e8ad09901c0ead911596015cb367dd1dfb93d665b1d4581ef
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that uses CreateObject to execute commands. The macro attempts to download and execute a VBScript payload from a hardcoded URL. The reconstructed URL is 'http://midnighitsilverbcraft.com/store/wBjNOUwc/B110N4cQA6R3/'. The script also attempts to create a batch file at 'c:\programdata\bhnasleil.bat' and a VBScript at 'c:\programdata\oue4hjld.vbs'. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' strongly suggests the Emotet family.

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
1cc4f7eb2ff707b9938deeb654ce0d1d1bd94651d342fd0d1fbe9fd65314a366		 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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