Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3df0e6cbabc4c5fc…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 4c88047879489de708b2c340be4bd3d4 SHA-1: a3d7899deab6935bec02fbb88f1cd37e4e310268 SHA-256: 3df0e6cbabc4c5fc4479814bbec442963812d34d6db11b5bcde4e7a967f0108b
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The presence of a Workbook_Open macro, coupled with CreateObject calls and references to Wscript.Shell, strongly indicates malicious intent. The macro attempts to download and execute a secondary payload using a reconstructed URL: 'http://youlandab.org/eln-image/n8DPZISF/'. The ClamAV detection as 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' further supports the Emotet family attribution. The embedded script also contains a long, obfuscated string that appears to be a list of URLs for downloading payloads, and it constructs a command to execute a VBScript file from the programdata directory.

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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