Emotet Office (OLE) malware analysis — malicious · a7e5135259449076

MALICIOUS

Office (OLE)

230.5 KB Created: 2020-08-14 23:47:00 Authoring application: Microsoft Office Word

MD5: c4f65f717c563847ad5fbfd6820a34ce SHA-1: 06ea58cef37427eb5e26932b731b2e1f160ebfaf SHA-256: a7e5135259449076e7e9347e68b99f2bf4929c5b67894a124dcc60e1dcb6b2a4

300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV as Doc.Downloader.Emotet-9349720-0. Static analysis revealed the presence of VBA macros, specifically a Document_Open macro that utilizes CreateObject to execute commands. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' indicates a command stager technique involving UserForm hidden properties. This suggests the macro is designed to download and execute a second-stage payload, a common characteristic of Emotet. No specific URLs or hostnames were extracted from the document body or scripts, but the ClamAV detection provides strong family attribution.

Heuristics 8

VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER

VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
ClamAV: Doc.Downloader.Emotet-9349720-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9349720-0
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` `c9e222625209724b824cd241f8d136260a3fd5171cd978940b3d275289318aae`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8071 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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