Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a58db419660648c6…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 2b54e53b443833dbf4a06eaf54b4b608 SHA-1: 0e4d833ba04de40337188b983292b349dbfd311d SHA-256: a58db419660648c63aee42a6bb966d1aac1208a78277366dc5121bf067d675a9
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 critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls indicate a malicious macro-based document. The VBA script contains obfuscated commands that reconstruct the following URLs for downloading payloads: 'http://midnighthsilvercrafters.com/store/wBjNOUw/B110N4cQ6R3/', 'http://temp.com/NAT_05_22_2009/BI710N4cQ6R3/', and 'https://redington.karmat'. It also attempts to drop and execute a VBS file to 'c:\programdata\oue4hjld.vbs' and a batch file to 'c:\programdata\bhnasleil.bat', which are typical behaviors for Emotet droppers.

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
f7aec9ae9fb368151fcf80288fbc493b78cd16ea80326b8fbacbeb15ea35996c		 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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