Emotet Office (OLE) / .DOCX malware analysis — malicious · 774c827f08696222

MALICIOUS

Office (OLE) / .DOCX

173.8 KB Created: 2020-07-29 18:24:00 Authoring application: Microsoft Office Word

MD5: 3158d249b1df418410378fb0a8acc3d3 SHA-1: 0b1a3f8ee1317f9001eaf098a8de861859d5ceac SHA-256: 774c827f086962222073ad050dfa5b10e8cc0411731e506edc4a0363f4a2815d

262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro, a common auto-execution technique, is present and utilizes 'CreateObject' to initiate a command stager. This stager is designed to be hidden within a UserForm, a known technique for Emotet to evade detection. The ClamAV detection name 'Doc.Dropper.EmotetIOS-9402070-0' strongly suggests the Emotet family and its dropper functionality.

Heuristics 7

VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER

VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
ClamAV: Doc.Dropper.EmotetIOS-9402070-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.EmotetIOS-9402070-0
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` `c16109e56e89ca797691e9b4375e60bba52071aacf9e64d6acc544d711f5ac66`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5058 bytes

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