Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3b7b729b876f7026…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 47214698bde62b361de259a7123626ad SHA-1: 932f214cc0c3a2e57d1b6c0777b12ae9f41f4edf SHA-256: 3b7b729b876f702688636c402b001c3d7abbe1aacc72d338a24cff6a3aed35cd
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros that leverage Wscript.Shell and RDS.DataSpace to execute obfuscated PowerShell commands. These commands are designed to download and execute a second-stage payload from a list of hardcoded URLs. The presence of Workbook_Open and CreateObject firings, along with the ClamAV detection signature, strongly indicates Emotet downloader activity.

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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