Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d0f538646380dd6f…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8407edc496b432d69ffb4db3aaf57e78 SHA-1: 926efef79226db976274d8cbf52966e37e1f34f0 SHA-256: d0f538646380dd6f3e2e0e6bbcc3547a583b85d757ad464664f8775728b96ef3
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains a Workbook_Open macro that uses CreateObject to instantiate Wscript.Shell, which then executes a batch file located at 'c:\programdata\jledshf.bat'. This batch file contains heavily obfuscated commands that appear to download and execute further payloads from multiple URLs. The presence of Wscript.Shell and the obfuscated execution chain are strong indicators of Emotet's typical downloader behavior.

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
c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5709 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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