Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ac10667fcd5a5346…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 0de7e77fb1a077597182099fe38bf845 SHA-1: 48331dfc9fe65a176e47541f1e125a9f3bcc7beb SHA-256: ac10667fcd5a53468613780f1c72440eb0c4b9e10ad539bfc5a708c8072c3aa8
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a macro-enabled Excel file detected as Emotet by ClamAV. The Workbook_Open macro is configured to execute a series of commands. The script reconstructs and executes the command: 'c:\programdata\bhnasleil.bat', which likely downloads and executes a second-stage payload from the provided URLs. The script also attempts to create a scheduled task or similar persistence mechanism using the reconstructed path 'c:\programdata\oue4hjld.vbs'.

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
82ccfbfc6ff966bad9b13b640a37c3b016dd3c6f1118b2a5d30921af5995f6dc		 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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