Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 0f077b752022ae55…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: f41ab022292346274edf449a86b0fdb3 SHA-1: 78ae54358e04c0d72acd12995c51bc3e155e0d7c SHA-256: 0f077b752022ae55f44a08b79682be5ded16f10ec1b101adbc4779831a3eacbb
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, including a Workbook_Open event, which is a common technique for Emotet. The macros utilize `CreateObject("Wscript.Shell")` to execute commands. The document body contains obfuscated commands that appear to construct and execute a batch file (`c:\programdata\jledshf.bat`) and download a DLL (`c:\programdata\vbkwk.dll`). The script also contains multiple URLs that are likely used to download additional payloads. The ClamAV detection name further supports the Emotet family attribution.

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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