Emotet Office (OLE) / .DOC malware analysis — malicious · 10b1ddd91ee8d2da

MALICIOUS

Office (OLE) / .DOC

202.9 KB Created: 2020-02-07 06:57:00 Authoring application: Microsoft Office Word

MD5: c2b47e5a02ac0c89e9ed854ae0cd565c SHA-1: eab6c59c252d1737e2039d6414a7f87b50640abb SHA-256: 10b1ddd91ee8d2da9ef9dfa5953c526b4c139d14dfa659e26bf595bf67807dbc

322 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains heavily obfuscated VBA macros, including a hidden UserForm and a command stager, which are characteristic of Emotet downloaders. The 'Document_Open' macro is designed to automatically execute upon opening the document. Heuristics indicate the use of CreateObject and Shell/exec functions, suggesting the VBA code attempts to download and execute a secondary payload. ClamAV detection confirms the presence of Emotet.

Heuristics 8

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.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Doc.Downloader.Emotet-7580152-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-7580152-0
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` `3f0ca153559580e9909ea957f633b30e0089d4d0e2f2fcb78b469f2ea6345901`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18488 bytes

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