Emotet Office (OLE) malware analysis — malicious · 29c27429a81caec5

MALICIOUS

Office (OLE)

230.1 KB Created: 2020-08-14 22:18:00 Authoring application: Microsoft Office Word

MD5: 91c1a076f12f0fd83d717ae81659414e SHA-1: 5a66d17ae2e8fb0ae2b5a345f7edff3a0ae674fd SHA-256: 29c27429a81caec5cc9d25cf7d663dd6747fa92569b49471b5c967d29b464260

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample was detected as Emotet by ClamAV, a known downloader family. Critical heuristics indicate a VBA UserForm hidden-property command stager, which is a common technique for executing malicious code. The Document_Open macro is designed to automatically run upon opening the document, likely to download and execute a second-stage payload. The presence of VBA macros and the specific detection name strongly suggest this attack pattern.

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-9343219-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9343219-0
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` `a41bede6b31c342f92c22747c23e2e7c6c77a42c803725a917c6179e5e099194`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8350 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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