Emotet Office (OLE) malware analysis — malicious · 03a70859a1f4dcac

MALICIOUS

Office (OLE)

186.9 KB Created: 2020-09-15 11:47:00 Authoring application: Microsoft Office Word

MD5: 8bdda590f63c71e8414b9df44c240e23 SHA-1: d3f28621be78252a0133b9111cbabcf457b35e29 SHA-256: 03a70859a1f4dcaca4505a3764d868e80bea5407131c6d224ebbf3066dba5c05

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 VBA macros, including a Document_Open auto-execution macro, which is a common Emotet infection vector. A critical heuristic identified an obfuscated PowerShell stager within a hidden UserForm, indicating the macro's intent to download and execute a secondary payload. The ClamAV detection name further supports the Emotet family attribution.

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.Dropper.EmotetWinMob0920-9636503-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.EmotetWinMob0920-9636503-0
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` `b8e07f1a26e378ad66aa45e874b33eb98cd646ec4a53c9d43f1763af1b17616f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22982 bytes

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