Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 5c75203be063df4b…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 46ac512ccdefa92416481e6a9ef21a7e SHA-1: 0de821106aa692487bf93d0a8c0265cdf56d6dcd SHA-256: 5c75203be063df4bd47afc4cbb9928fbad7c26f24e938fa5bcd4f336d552365f
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The Workbook_Open macro in this Excel file is designed to execute a batch file and a VBScript, both of which are obfuscated to appear as legitimate file paths. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://aiqyana.com/wp-admin/6pY001tdOxY1b10/'. The presence of Wscript.Shell and CreateObject calls, along with the Emotet detection by ClamAV, strongly indicates a downloader functionality.

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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