Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 fba993f78e1bb572…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 81e717bc8bafea984418d277b43ded1d SHA-1: bad7a0d1c31ac9e13303b0847c886085e44a3fbc SHA-256: fba993f78e1bb572aca2ef90a92d0df91d0d1bd1d05295895a00326832734280
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The Workbook_Open macro fires upon opening the Excel file, triggering the execution of Windows Script Host (wscript.exe) to download and execute a payload. The VBA code attempts to download from multiple URLs, including 'http://taste-donline.com/cgi-bin/bin/14LG3P2Dt3rqBmaYZ0/'. This behavior is characteristic of Emotet downloaders, which are known to use macro-enabled documents for initial infection. The ClamAV signature also explicitly identifies it as an Emotet variant.

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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