Emotet Office (OLE) malware analysis — malicious · f1889cf61020e82a

MALICIOUS

Office (OLE)

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

MD5: 1b2b963db4faf621d7e6af43c0dea57e SHA-1: c3247fee270bd03db179cdd696ab8d3e4ec88269 SHA-256: f1889cf61020e82a3a09189d111623e320c0de288cf6358a8b78faf84c221f6c

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 identified as malicious by ClamAV and exhibits critical heuristic firings for an OLE UserForm PowerShell encoded command stager. The Document_Open macro is present and uses CreateObject, indicating an auto-execution attempt. The extracted PowerShell command appears to be a deobfuscated stager that likely downloads and executes a second-stage payload. The presence of the 'Emotet' family signature further supports this assessment. The reconstructed registry key for persistence is 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.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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