Emotet Office (OLE) malware analysis — malicious · b76cf3ae2201a62c

MALICIOUS

Office (OLE)

157.0 KB Created: 2020-09-14 23:20:00 Authoring application: Microsoft Office Word

MD5: 7a1ef554d3dac70838d4cb4627ef0451 SHA-1: 33861e5bc04d25d8f638f70737596fa0891bdf0c SHA-256: b76cf3ae2201a62c66194274d7aadcd10013050e5ae0dce09ebb9ce7b5e181e9

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The file is a malicious Office document containing VBA macros. A critical heuristic identified an obfuscated PowerShell stager within a hidden UserForm, specifically using an EncodedCommand. The Document_Open macro is present and calls CreateObject, indicating it's designed to execute automatically upon opening. The presence of the 'macros.bas' artifact and the ClamAV detection for Emotet strongly suggest this family. The PowerShell stager is likely responsible for downloading and executing 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.Malware.Emotet-9762289-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Emotet-9762289-0
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` `c2c6c828c036fac6100aee871b53e2578aa69d81979ea582439457589bcf0fbb`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18613 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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