Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d04937ae4f6922b9…

MALICIOUS

Office (OLE) / .XLSX

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: e3032a69aa026cd91c053324758d4f5f SHA-1: 25ea38904bb1f02418d09386a82d9738f3e56673 SHA-256: d04937ae4f6922b97cf93d5c966da8c9cf19bad8440e0633fb7ae4a1e0f3801c
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as Emotet by ClamAV. The Workbook_Open macro is configured to execute a command that constructs a batch file at 'c:\programdata\rtyusdj.bat'. This batch file is then executed, likely to download and run a secondary payload. The VBA script also contains multiple concatenated URLs which are likely sources for the malicious payload. The use of Wscript.Shell and CreateObject further indicates the execution of external commands and scripts.

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
ffa342a8bb4eb541fe833e6254cf3f6e2f7d6f5436c011440a061030b6684f64		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6473 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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