Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 c636fb2fc2872b02…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8134fdb8313bdf3322c4ec2df8fedcbe SHA-1: 17ed51e2c6bb849ef9932c5bb43ac16c8aa96b33 SHA-256: c636fb2fc2872b02c3f95dff8514bbdf7be9433c9fd058184fe10c3bdc1aadbe
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1105 Ingress Tool Transfer

The sample contains VBA macros that are automatically executed upon opening the workbook, as indicated by the Workbook_Open heuristic. The script uses CreateObject to instantiate Wscript.Shell and then executes a batch file located at 'c:\programdata\jledshf.bat'. The script also reconstructs a URL from concatenated strings, which is likely used to download a second-stage payload. The presence of Wscript.Shell and the download functionality strongly suggest Emotet's typical 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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