Emotet Office (OLE) malware analysis — malicious · 7dc1af0f8b1add8e

MALICIOUS

Office (OLE)

155.6 KB Created: 2020-09-15 06:48:00 Authoring application: Microsoft Office Word

MD5: ac6cc04c11e497df25c3100399c30a98 SHA-1: 8a01be9bf68bea955c594507013b362f444b3c70 SHA-256: 7dc1af0f8b1add8e2a7b43e7a132612a4f4b48c1392bc42641c1e048a921c9b4

262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-9760846-0', indicating a downloader functionality. Heuristics confirm the presence of obfuscated PowerShell within a UserForm and a Document_Open macro that uses CreateObject, strongly suggesting an attempt to execute a malicious payload. The VBA code appears to be constructing and executing a PowerShell command, likely for downloading and running a second-stage payload.

Heuristics 7

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.Downloader.Emotet-9760846-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9760846-0
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.
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` `d836c5415d0cd6d772a683c60ac608b6fac152a60e8d7adaeb3bed5561a7f6e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22931 bytes

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