Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ec84097f76e4fd90…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 5294a8d7de23dff0e2f0b4180efebbea SHA-1: 1b3bdc1c4109066b532930859b8f791449decc82 SHA-256: ec84097f76e4fd9065a7d44d964b67939b0f4b2310047cc694854e1fb3848e15
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0', strongly suggesting the Emotet family. High-severity heuristics indicate the presence of VBA macros, specifically a Workbook_Open auto-execution event that uses CreateObject. The embedded VBA script contains obfuscated code that reconstructs URLs and commands. Notably, it constructs the URL 'http://midnighitsilverbcraft.com/store/wBjNOUwc/B110N4cA6R3/' and 'http://temp.NAT_05_22_2009/BI710N4cA6R3/', and a partial URL 'https://redington.karmat'. The script also appears to download and execute a VBS file from 'c:\programdata\oue4hjld.vbs' and a BAT file from 'c:\programdata\bhnasleil.bat', indicating a downloader functionality.

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
f67b05ab7194623b89706ff833333f4455e25344ea573a9ea9a924d7bf994890		 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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