Emotet Office (OLE) malware analysis — malicious · 0173bbdacb1a9dde

MALICIOUS

Office (OLE)

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

MD5: 237d5d07ff3c6816dd9ff0a17e9d90a1 SHA-1: 4e859ccabd7f8b4162400cccc640b18eaca244e0 SHA-256: 0173bbdacb1a9dde15e6c653d51b821b601c01e005a3b6deb69ebc32f5a055b6

262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1497.001 System Checks: System Checks

The sample contains a Document_Open VBA macro that triggers an obfuscated PowerShell stager. This stager is designed to download and execute a secondary payload, a common tactic for Emotet. The ClamAV detection name also strongly suggests Emotet. The embedded URL is benign and likely a false positive from the extraction process.

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.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.
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

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