Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3f7e95a3e2843b7a…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: b7cdfac3aed8a424cbc29e8790f6de63 SHA-1: 13e5818f07574a0073cd3a795d3a75ecfafea1e7 SHA-256: 3f7e95a3e2843b7a17f795bc4b0a28c946b49f170eacc05a1c043c8aa6802ab6
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is a macro-enabled Excel file that utilizes VBA macros to download and execute a second-stage payload. The Workbook_Open event is triggered, which in turn calls CreateObject to interact with Wscript.Shell. The obfuscated document body contains multiple URLs that are likely used to fetch the next stage of the infection. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests an Emotet family infection.

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
0682b1dabb01229c8492cae5e8f124b2428b3f7af0a3adfd56447b0856c75734		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6592 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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