Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 0ca3fc52c98bf390…

MALICIOUS

Office (OLE)

155.2 KB Created: 2020-09-15 06:48:00 Authoring application: Microsoft Office Word
MD5: b7791bc652bbd687d06e0595346d90a7 SHA-1: c2278874e025cbabb835478099d76bba91d3a2ef SHA-256: 0ca3fc52c98bf39030583a27d2a1033bc875b2c981f9a2d0cd0b3f75f2c04fb8
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains heavily obfuscated VBA macros, including a Document_Open auto-execution macro and a UserForm containing an obfuscated PowerShell stager. The ClamAV detection explicitly names this as Emotet, a known downloader family. The VBA script's primary function appears to be the execution of a second-stage payload via PowerShell.

Heuristics 7

  • Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL
    OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
  • ClamAV: Doc.Downloader.Emotet-9760846-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9760846-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d836c5415d0cd6d772a683c60ac608b6fac152a60e8d7adaeb3bed5561a7f6e2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22931 bytes

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