Emotet Office (OLE) malware analysis — malicious · 0bddf95b8e65f553

MALICIOUS

Office (OLE)

155.9 KB Created: 2020-09-14 23:20:00 Authoring application: Microsoft Office Word

MD5: 478acb75ce53b6314ddd608cfe4f3178 SHA-1: 7041fe8d636b5ef1f02bdf3e3495efba6fe70943 SHA-256: 0bddf95b8e65f553f003ab0bb5c52d8a82ad27f4fc1dcaf0b044ec9b9001a563

262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The macro is obfuscated and uses CreateObject to execute a PowerShell stager, as indicated by the OLE_USERFORM_OBFUSCATED_POWERSHELL heuristic. The ClamAV detection name also points to Emotet. The Document_Open macro is designed to automatically execute upon opening the document.

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-9762289-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Emotet-9762289-0
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` `c2c6c828c036fac6100aee871b53e2578aa69d81979ea582439457589bcf0fbb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18613 bytes

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