Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ba15ebfd57d01ad0…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 287525d0bff462333575990d4f7e61e6 SHA-1: ba0f09913ab03fb7ef6807c2ab1c5d94d24b6d5d SHA-256: ba15ebfd57d01ad0620092a7412a1285e49747fd73b8f4aec631b9b6c21b451e
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains VBA macros that trigger on workbook open, indicative of Emotet's typical delivery mechanism. The macros utilize obfuscated PowerShell commands to download and execute payloads from multiple URLs. Specifically, the PowerShell command decodes a Base64 string which contains a list of URLs to fetch the next stage. The presence of 'Wscript.Shell' and the creation of batch and VBScript files further support the downloader functionality.

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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