Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d28c7af65b39c28b…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: cfd1f50597615a1c0deb4942c8058272 SHA-1: e7d52475436cc54f037c52bcc65fa58828d683fe SHA-256: d28c7af65b39c28b3ac9f3f7d93452133b0b6634166bdba3d77a31ba7b26deb3
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script leverages `CreateObject` to execute obfuscated PowerShell commands. These commands reconstruct a URL to download a second-stage payload and save it as a .bat file in `c:\programdata\jledshf.bat`. The ClamAV detection name also strongly suggests Emotet. The reconstructed URL is: `http://store.uxdummmit.com/wp-admin/VfgBASQ7Z/ ,http://glorenental.com/wp-admin/f12eAKGTnS6I/,http://candise.bmint.org/1g94ngo/2n7wJoPuPDaX/,http://bachilleatoropociclo.org/`.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
  • 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
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12041 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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