Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 cf98fab545737eef…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 20bca9b80bffa4520f958c93a4407d18 SHA-1: 45de0c645f1f64f2486374d0d701f7fdb24a9c8f SHA-256: cf98fab545737eeff3b1bcc044584bbae9e15afb1b2470ec4902c4eb48478088
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic

The sample contains VBA macros that trigger on Workbook_Open, indicative of malicious intent. The script utilizes CreateObject to instantiate Wscript.Shell, which is then used to execute a batch file located at 'c:\programdata\jledshf.bat'. This batch file appears to download and execute a second-stage payload from a list of obfuscated URLs. The presence of Wscript.Shell and the execution of external commands strongly suggest a downloader functionality, consistent with 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
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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