Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 0ec418e8980ab3a6…

MALICIOUS

Office (OLE)

158.9 KB Created: 2020-09-15 13:42:00 Authoring application: Microsoft Office Word
MD5: 2fed14165095d1fd13b4b271f555422c SHA-1: c709cab642497ce95bf9fb25df4a24e94d1383c9 SHA-256: 0ec418e8980ab3a6855c2e01e16335d606b8f8b54a4eb3dd9e3ac41201668ffc
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 a VBA macro with a Document_Open auto-execution routine. This macro utilizes CreateObject to launch an obfuscated PowerShell command, which is designed to download and execute a second-stage payload. The presence of an obfuscated PowerShell stager and the ClamAV detection strongly indicate Emotet activity.

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.Malware.Emotet-9762371-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9762371-0
  • 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
8bee8f90d9dfb3891c7c232e7baf01a2aaa2db95a501fe4ff2d320babae29389		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22935 bytes

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