Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 6a3804312131a235…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: f4d21e2b6e4f83047295ff58875cfd7c SHA-1: 52315b70d08b0d2e07b2013da0d96f043ea916b3 SHA-256: 6a3804312131a2353d92a3732d2308e99f706bb0aef568e9dfde3279a4326295
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Workbook_Open event, which is a common technique for Emotet. The macros utilize CreateObject to execute Windows Script Host and obfuscated commands. The obfuscated commands attempt to download and execute a batch file from multiple URLs, including 'http://aixyana.com/wp-admin/6pY00tdOxY10tdOxY10' and 'https://ncikjeja.com/baca/lO46UEiVnam/', and also attempt to execute PowerShell commands. The presence of these elements strongly suggests a downloader functionality typical of the Emotet family.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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.
  • 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
c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5709 bytes

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