Emotet Office (OLE) malware analysis — malicious · ef0155dfa125f37f

MALICIOUS

Office (OLE)

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

MD5: 4421d0f1239a6b5ffe6166e05458e27f SHA-1: 2a02c39547d3f9b0c657d94403096d7730928ff0 SHA-256: ef0155dfa125f37fe72651907abd58ca621278f4e6af8ed772c2190c0984d6b2

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 obfuscated VBA macros that trigger on document open. A critical heuristic indicates a UserForm PowerShell encoded command stager. ClamAV detection confirms this is Emotet. The VBA code likely decodes and executes a PowerShell command to download and run a second-stage payload, as suggested by the 'OLE_USERFORM_OBFUSCATED_POWERSHELL' and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' firings.

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.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.
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` `b8e07f1a26e378ad66aa45e874b33eb98cd646ec4a53c9d43f1763af1b17616f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22982 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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