Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 373b5c492ecf26c7…

MALICIOUS

Office (OLE) / .XLSX

144.0 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: a5388a2daa65b66e4accbac8ea5c69ea SHA-1: d0644b3f64027ab71eec85b9cddeb4f6b326d095 SHA-256: 373b5c492ecf26c7124546c3e01f8312782cfddba6eaf96abdea35c842eb184e
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02226-9938630-0', strongly suggesting the Emotet family. The Workbook_Open macro is configured to execute, and it utilizes `CreateObject` to instantiate `Wscript.Shell`. This object is then used to execute a batch file located at `c:\programdata\tydkjxjd.bat`. The script also contains numerous concatenated strings that reconstruct multiple URLs, which are likely used to download and execute a second-stage payload. The presence of `Wscript.Shell` and the download URLs indicate a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
022b6ea87e671715cd07f596eceb5d45e85534a367868a0e820c8aa5cb013822		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6734 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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