Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 8f7bed16068f5ef6…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 72c220d5a07481f32e7ab238da962d18 SHA-1: be81420799a1153cf88d2fca62843d7e9301082e SHA-256: 8f7bed16068f5ef6384134dfe51ce5dfcab48a595abcf6cece5ffdc0422da188
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 sample is a malicious Excel file containing VBA macros, identified by ClamAV as Emotet. The Workbook_Open macro is triggered upon opening, which uses Wscript.Shell to execute a batch file. This batch file, in turn, constructs and executes a PowerShell command that downloads and executes a second-stage payload from multiple URLs. The reconstructed PowerShell command is: 'hell -e ' and the URLs are: 'http://youlanda.org/eln-image/n8DPZISf/', 'http://roservideob.net/eln-image/EjdcOMlY8Gy/', 'http://vbaint.com/eln-image/H2pPGte8XzENc/', 'https://framemaker.us/eln-image/U5W2IGE9m8i9hr/', 'http://niplaw.com/asoLidoundatio', 'http://robertflolod.us/eln-image/DGI2YOkwc9XPO/', 'http://mpmcomputing.com/fonts/JO5/', 'http://robertflolod.us/cegi/3f/', 'http://vocoptions.net/cegi/ifM9R5ylbVpM8hfr/'. Additionally, it drops two files, 'c:\programdata\tjspowj.vbs' and 'c:\programdata\uidpjewl.bat'.

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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