Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 fb10b2fc2fa83904…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 94a9fee5f2d0ea685b18d32ceba894f7 SHA-1: 49b53dc53ff920cfe4f314305ba420864f49056a SHA-256: fb10b2fc2fa83904047bd82e6e7ec80c4997f96a24cc3cc06f837d96a49149ef
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic

The file contains VBA macros that execute via the Workbook_Open event, indicative of a downloader. The script utilizes `CreateObject` to instantiate `Wscript.Shell` and subsequently executes a batch file (`c:\programdata\jledshf.bat`) and a VBScript (`c:\programdata\tghklsd.vbs`). The VBScript itself is heavily obfuscated but appears to download payloads from multiple URLs, including `http://store.uxdummit.com/wp-admin/VfgBASQ7Z/`. The ClamAV detection name further supports the Emotet family attribution.

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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