Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a5c821bab9957398…

MALICIOUS

Office (OLE) / .XLSX

144.0 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: 67a6c19b3fa56d4ff92659642f4cd5d5 SHA-1: 0345e8ac0575faa42eea721451a03072e7073d9f SHA-256: a5c821bab995739810118ba6d1d3c8327cf6aaa09dfffe85596cfd5596199db7
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file that utilizes a Workbook_Open macro to execute a batch script. The script, 'c:\programdata\uylcsekn.bat', is designed to download and execute a second-stage payload from a list of hardcoded URLs. The presence of Wscript.Shell and CreateObject calls within the VBA code further supports the malicious intent of downloading and executing arbitrary code. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests the Emotet family.

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
022b6ea87e671715cd07f596eceb5d45e85534a367868a0e820c8aa5cb013822		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6734 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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