Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 6880d2e79190370d…

MALICIOUS

Office (OLE)

155.0 KB Created: 2020-09-15 06:48:00 Authoring application: Microsoft Office Word
MD5: 49d264b2072abc5898d3bf1dc8166cba SHA-1: eb45bd71115ad5cf1cc2382224d7520f6ecb41f8 SHA-256: 6880d2e79190370d40b0b27d9a18e34142fab5a99a6e94aac94e5e32c8cbfe84
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a critical heuristic firing for an obfuscated PowerShell stager within a UserForm, triggered by a Document_Open macro. This macro uses CreateObject, indicating a high likelihood of malicious execution. ClamAV also identifies the file as 'Doc.Downloader.Emotet-9760846-0', strongly suggesting Emotet family involvement. The primary function appears to be downloading and executing a second-stage payload.

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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