Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 94903b1b207ad0bb…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 4bcb71ecd7b74a67c4e66573dda989dd SHA-1: 4a0073ac92b40a69e432128f2340cd6b93f242b9 SHA-256: 94903b1b207ad0bb619b5a98b1b029f0d6ac1927e9aa1223426f029b2f51d244
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0', indicating a strong likelihood of the Emotet family. The Workbook_Open VBA macro is designed to execute automatically, and it contains a call to CreateObject, which is often used to instantiate malicious objects or execute scripts. The embedded VBA script reconstructs a long string of URLs, likely for downloading a second-stage payload, and also contains a command to write to the registry Run key for persistence. The DOC BODY also contains commands to create a VBScript and a BAT file, further supporting the download and execution of malicious content.

Heuristics 7

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 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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