Emotet Office (OLE) malware analysis — malicious · a3384ba577af296b

MALICIOUS

Office (OLE)

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

MD5: 04de9e5370643f9241f4d0233626caf7 SHA-1: b0df1733f731d0fff25d367e59c7241a5c556b00 SHA-256: a3384ba577af296b4baa8ce02d0b093741cb76e47914a6f2a21dc1fcaafa2ecc

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is a malicious OLE document containing VBA macros. A critical heuristic identified an obfuscated PowerShell stager within a hidden UserForm, which is a common Emotet delivery technique. The Document_Open macro is configured to execute this stager. The reconstructed PowerShell command indicates it establishes persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy' and then proceeds to download and execute a second-stage payload.

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.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.
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` `d836c5415d0cd6d772a683c60ac608b6fac152a60e8d7adaeb3bed5561a7f6e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22931 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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