Emotet Office (OLE) malware analysis — malicious · 91cd3b60436f34a7

MALICIOUS

Office (OLE)

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

MD5: 09cb67890ec1470d406a8ea7517e2a58 SHA-1: 49911767e930fb79a9afc41956c659729951c154 SHA-256: 91cd3b60436f34a769f1968b52ca6757264faceb13eaba5389893e6377f5e0a9

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Dropper.EmotetWinMob0920-9636503-0', strongly suggesting the Emotet family. Heuristics indicate the presence of VBA macros, specifically a 'Document_Open' auto-execution macro that utilizes 'CreateObject' to initiate a PowerShell stager. This stager is likely responsible for downloading and executing a secondary payload, a common Emotet delivery technique. The obfuscated PowerShell command within the document body confirms this behavior.

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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