Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3be57f516cbc4aac…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 1f517e62b02fbcd91f110413c77f1968 SHA-1: ecebe84bb4caa52401b70f3fdd09f22f7c503f49 SHA-256: 3be57f516cbc4aacb419df9f6a2381343734d648b21f16b2eca0649c80bf2591
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 sample is a malicious Excel file containing a Workbook_Open VBA macro. This macro is designed to execute a series of commands. It attempts to download a VBS file from a hardcoded URL ('http://midnighsilvercraft.com/storer/wBjNOUwc/BI710N4cQA6R3/') and a BAT file from another URL ('http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/'), saving them to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat' respectively. The script then executes these downloaded files, indicating a downloader functionality. The ClamAV detection as 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' further supports this assessment.

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
40b57928452f638809429bea6688445ca1acce419d72270c88a3812ebeaf9567		 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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