Emotet Office (OLE) malware analysis — malicious · b484a3ded2b75029

MALICIOUS

Office (OLE)

186.7 KB Created: 2020-09-15 11:47:00 Authoring application: Microsoft Office Word

MD5: d8807bfd0dfa458ad0d1e9e8dd7682b1 SHA-1: 5d85158377a5845b9d5419c16be9647ae0d23d16 SHA-256: b484a3ded2b75029607dd3ecedc2caaccd6dcd90ae16bf68c5cea9858ce35dba

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample was detected by ClamAV as 'Doc.Dropper.EmotetWinMob0920-9636503-0', strongly indicating the Emotet family. Heuristics confirm the presence of obfuscated PowerShell stagers within a UserForm and a Document_Open VBA macro that uses CreateObject to execute it. The extracted VBA code, though truncated, shows evidence of PowerShell execution with encoded commands, typical for downloading and executing further stages. The presence of a 'macros.bas' file further supports this.

Heuristics 8

Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL

OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
ClamAV: Doc.Dropper.EmotetWinMob0920-9636503-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.EmotetWinMob0920-9636503-0
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` `b8e07f1a26e378ad66aa45e874b33eb98cd646ec4a53c9d43f1763af1b17616f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22982 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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