Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 db06eb9169626252…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: f40e5db3bdd4abe5f423aeb864cbb8c2 SHA-1: fe71fc5cb530c92e1fe80ed90f86aa6c6afa142a SHA-256: db06eb916962625254619fe0d275c13171399b725be1ca10c09de730c0f8a530
280 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 contains VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for Emotet. The macro uses CreateObject to interact with Wscript.Shell, indicating it will execute commands. The DOC BODY reveals the script attempts to download and execute payloads from multiple URLs, including 'http://youlanda.org/eln-image/n8DPZISf/' and 'http://roservideob.net/eln-images/EjdcOMlYZ8Gy/', and creates batch and VBScript files in 'c:\programdata\'. The ClamAV detection also strongly suggests the Emotet family.

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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