Emotet Office (OLE) malware analysis — malicious · f331d4c27ee92400

MALICIOUS

Office (OLE)

234.2 KB Created: 2020-08-14 21:43:00 Authoring application: Microsoft Office Word

MD5: b3fc62d4d5f4ef63ab180b86b33a719f SHA-1: 7c0216c96502f1038a3561ddce59ebe82f173373 SHA-256: f331d4c27ee924006b6870864d5a4b2d782d022b7411fc7fcd0b275cec1e62ec

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file contains VBA macros, specifically a Document_Open macro that utilizes a hidden UserForm as a command stager. This technique is characteristic of Emotet, which often uses such methods to download and execute further malicious payloads. The ClamAV detection explicitly names Emotet, reinforcing this classification. The embedded URL, while benign, is part of the document's structure.

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.Emotet-9348583-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9348583-0
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` `34c0de223fb155b200470dd74532eb17cc8088993a15437bad69cdda5f3fc0cc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7690 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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