Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 4999d62ff50b8b40…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a63f0b7fe4ef71b24caaa36e44c500ec SHA-1: 0bbd18ebe58dc85ea07f6a116ef55e22ac3d097a SHA-256: 4999d62ff50b8b401c92558f8e829d19991c8c1694f4838cf137ed992aab3c08
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetRed02220-9938909-0'. Static analysis reveals a Workbook_Open VBA macro that utilizes CreateObject to instantiate Wscript.Shell. This script is designed to download and execute a second-stage payload from a series of concatenated URLs, which are reconstructed to 'http://santoetortilla.com/_baks/tUX9/http://donbahame.com/Home_files/YS0PAPzYeraes/,http://barnhart-studies.com/eln-images/vggh1ng/ ,http://blut.com/3Dtech/jLu8IAnnj3gK9WC/,http://zenzebra.net/plath/9Q0DBle/,http://reacour.net/PhotoGallery/Uw mRHceSGbAcEGf/,http://miniflam.com/eln-images/fSwbQjU MAFgxwdw/,http://marezdecor.com/MarezAgallery/SEQxWtpMJ7A8rAtY/DGFDRFs57dTFgjiDYigukcvghjGFmjFxchdGFSdFqw3eDThfgH'. The script also attempts to drop VBS and BAT files to 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat' respectively.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 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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