Emotet Office (OLE) malware analysis — malicious · 091e7d3539fbb1cf

MALICIOUS

Office (OLE)

152.4 KB Created: 2020-09-14 20:00:00 Authoring application: Microsoft Office Word

MD5: 89ac3188e56234a1d9bc086b6a1daed2 SHA-1: bf350f24b01e9aeb1d40152aee49324c1c315d46 SHA-256: 091e7d3539fbb1cfb971b96abeeeb3b0e2abbaa3f19bbcf605f36589b2f7fadf

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 critical heuristic firing for an obfuscated PowerShell stager within a UserForm, along with high-confidence firings for VBA macros, a Document_Open auto-execution macro, and a CreateObject call. The ClamAV detection explicitly names Emotet. The VBA macro appears to be constructing and executing a PowerShell command, likely to download and run a secondary 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.Malware.Emotet-9762672-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Emotet-9762672-0
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.

Filename	Kind	Source	Size
`macros.bas` `c7305ccc26d392bb87c692b42d2d6bc38b982a0e4da883514cef9164df30503f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18576 bytes

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