Emotet Office (OLE) malware analysis — malicious · c8410c8dd820bc1e

MALICIOUS

Office (OLE)

157.7 KB Created: 2020-09-15 13:42:00 Authoring application: Microsoft Office Word

MD5: 2862eec7adc6a1a8893c5e970c74d016 SHA-1: 4a1499b9533dcbf01f65d85700629448027956fc SHA-256: c8410c8dd820bc1e8805ba93260cd2fb0f7707d75573915bdb97ea2a01b66ea8

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file contains obfuscated VBA macros that trigger on document open. A critical heuristic indicates a UserForm PowerShell encoded command stager. This suggests the macro is designed to download and execute a second-stage payload. The ClamAV signature also points to Emotet.

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-9762371-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Emotet-9762371-0
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` `8bee8f90d9dfb3891c7c232e7baf01a2aaa2db95a501fe4ff2d320babae29389`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22935 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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