Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 d4583739e2efd12b…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: d8c85381140fa2bac0b16719ae66129e SHA-1: acb8b8b6deba99697d7a59e2987848e548507372 SHA-256: d4583739e2efd12b9cb48e8975b7d7ff2b9a28e359b5efb590dfeca57d9faee9
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros that utilize `CreateObject` to instantiate `Wscript.Shell`. This object is then used to execute two files: `c:\programdata\yhjlswle.vbs` and `c:\programdata\ughldskbhn.bat`. The VBScript appears to be a downloader, attempting to fetch payloads from multiple URLs, including `http://fullness-safeaty.com/-/P6x/-/,https://nabajyofundation.com/da8uc7jo/4Za/,http://dwmasster.com/wp-content/eBH2UFY2/,http://formula8020.com/cs/56Dzi0P/,https://calad-formation.fr/r3x94z/kgZ9OGCi/,http://lis`. The `Workbook_Open` auto-execution heuristic and the ClamAV detection strongly indicate Emotet activity.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 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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