Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3ac6912e5bc5681f…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 7e63a9f0feb1913ee0f6841003e43738 SHA-1: fe12f84fb7e2a0ca11a634736c0e47d06ec03a00 SHA-256: 3ac6912e5bc5681f4cb81a5efc000bb01feb11232041959ccb64c65b66e966d8
240 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 file is identified as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0'. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious intent. The VBA script attempts to download and execute a second-stage payload from a reconstructed URL: 'http://midnighitsilverbcraft.com/store/wBjNOUw/B110N4cA6R3/,http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/,https://redington.karmart'. It also writes two files to disk: 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
a04f87303d45d91a6a100cc1c35b972f76616c689f7e1d57c511cb2ed4ad809a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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