Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 c89cc0843708980b…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7b8da469298862130eb5c2ab29c0a592 SHA-1: 56f34bcde632f24a2e613a503a7f85e7ec8f5741 SHA-256: c89cc0843708980b787f9c3ef96978b429c4c1ef34060b44f29d0d4a5d8e70e9
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is detected as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0', indicating it's a known Emotet downloader. The Workbook_Open macro is present and uses CreateObject to interact with Wscript.Shell, suggesting it's designed to execute commands. The script attempts to download payloads from multiple URLs, including reconstructed URLs like 'http://store.uxdummmit.com/wp-admin/VfgBSQR7Z/', and save them as '.bat' and '.vbs' files in the 'c:\programdata\' directory.

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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