Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a920400b29def909…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: cb09f0560d5f9d18770650abda047259 SHA-1: f7bfc292bbd9ddeac444060368e6e937b08b3e67 SHA-256: a920400b29def9094973ca292da8120d0f474d65012dd9d68f2e24b1b03dd247
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 Workbook_Open macros and CreateObject calls strongly indicate malicious intent. The VBA script within 'macros.bas' is designed to execute a series of commands, including the creation of a VBS file ('oue4hjld.vbs') and a batch file ('bhnasleil.bat') in the 'C:\ProgramData' directory. The script also attempts to download a second-stage payload from the reconstructed URL 'http://midnighitsilverbcrqfter.com/store/wBjNOUw/B710N4cQA6R3/', which is a clear indicator of a downloader functionality, characteristic of the Emotet family.

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
5480e4e492b5eade678d6c7ef439018e83c8e5018157364c48e6a5ea55f43e01		 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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