Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 9f245624c42b92be…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 369dd2ebe2f3e5189e98b05291198eb7 SHA-1: 50842d9081721dabf4e0eecd12a2e7c1b8d9e814 SHA-256: 9f245624c42b92be54d91128cc981f7ad77ac722944dba113bcee7c50757afcf
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains a Workbook_Open macro that executes a Windows Script Host object to create and run a batch file. This batch file, in turn, appears to download and execute a second-stage payload from a list of URLs. The reconstructed URL is "http://youlanda.org/eln-images/n8DPZISf/l,http://roservideo.net/eln-images/EjdcCoMLY8Gy/,http://vbaint.com/eln-images/H2pPgtE8XzENc/,http://framacarekers.us/eln-images/U5W2IGE9m8i9r/,http://niplaw.com/asons/JO5/,http://robertflolod.us/eln-images/DGI2YOkwS9XPOC/,http://mpmcomputing.com/ceg9/3f/,http://vocoptions.net/ceg9/ifM9R5ylbVpM8hfr/,http://misionnync.org/fonts/JO5/,http://robertflolod.us/eln-images/DGI2YOkwS9XPOC/". The presence of the 'CreateObject' call and the 'Wscript.Shell' reference strongly indicate malicious intent. The ClamAV detection as 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' further supports the Emotet family attribution.

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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