Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 453df18f5380b491…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: afea9eeaaf6bda1ebe589f5830546c98 SHA-1: e1d381ecc93ab35c010369b45805dac79f6f26fc SHA-256: 453df18f5380b491ad426a267bbdf27b322e186d884e0927f318c188c1313073
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0. High-severity heuristics indicate the presence of a Workbook_Open macro that uses CreateObject to execute code. The extracted document body contains obfuscated commands that reconstruct to the execution of a VBScript file from 'c:\programdata\oue4hjld.vbs' and a batch file from 'c:\programdata\bhnasleil.bat'. The VBA macro itself contains further obfuscated code that appears to be constructing URLs for downloading additional payloads. The presence of these elements strongly suggests a downloader functionality typical of the Emotet family.

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
4f28e28017b55e0494d2e4eba4e17c80d09daf3733fce04930f532556735b625		 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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