Emotet Office (OLE) / .DOCX malware analysis — malicious · 41db1933b994da15

MALICIOUS

Office (OLE) / .DOCX

224.5 KB Created: 2020-08-28 06:20:00 Authoring application: Microsoft Office Word

MD5: 1998a74e24621247c0d0a44a16522c6e SHA-1: 7ca6c756529d37bd5c2e9ce34f7492d211ae8e1d SHA-256: 41db1933b994da15ee67617d4fb7e8931aa65afbaa1c82df543d050d67c2a693

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The file contains a VBA Document_Open macro that utilizes a hidden UserForm to execute a command stager. This stager is designed to deobfuscate and execute code, a common technique for downloading and running secondary payloads. The ClamAV detection name 'Doc.Downloader.EmotetRed02226-9938639-0' strongly suggests Emotet family involvement. The presence of VBA Chr string obfuscation and auto-execution terms further supports this analysis.

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.
ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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` `53e7c3ae3329a96f6b6d5469949b0af86923f418ff709177e418efd7d8587856`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13575 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 45 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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