Emotet Office (OLE) malware analysis — malicious · cb6e641825c4b9b3

MALICIOUS

Office (OLE)

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

MD5: a3c7f3fe1c8308e1ac046fa9acaca376 SHA-1: 326f4e9ebc9e80973b2e31f8acf4e041e2de5156 SHA-256: cb6e641825c4b9b3dedb8bca6f5e8759d21a3f5a72cecd7b8fee14075a09e27d

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample contains a Document_Open VBA macro that utilizes CreateObject to execute an obfuscated PowerShell command. This PowerShell stager is designed to download and execute a second-stage payload. The ClamAV detection and heuristic firings strongly indicate the Emotet family, known for its macro-based delivery and downloader capabilities. The reconstructed PowerShell command indicates persistence is attempted via the Run key: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy.

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.Emotet-9761056-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Emotet-9761056-0
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` `b4e7e6a496a33a5d51b25c403e1165bdc88602f70d8eedc62b6d635ba4d9d28a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22614 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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