Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 f480eb8943163750…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 0d925ae8f1397d2b3b1cff747eec0271 SHA-1: 314af610b1e89b38b1bc7bee719999de0bb338e0 SHA-256: f480eb894316375084938d2ee7c6f2ec4b2d94749d1a89645accfa49b3de0324
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution and CreateObject call, strongly indicate malicious intent. The embedded VBA script, although partially obfuscated, attempts to download and execute files from multiple URLs, including 'http://midnighitsilverbcraft.com/store/wBjNOUw/B710N4cQ6R3/' and 'http://tempra.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and saves them as 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. This behavior is characteristic of Emotet's downloader functionality.

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
4eb7facacdd2568d8a81a66576ce5cdcf05d91efb35fec3b90a17973244f8d25		 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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