Emotet Office (OLE) / .DOC malware analysis — malicious · 23f4a774007e2fc6

MALICIOUS

Office (OLE) / .DOC

203.8 KB Created: 2020-02-05 15:55:00 Authoring application: Microsoft Office Word

MD5: 81083ae942aa8cacb808b84fc3fb1959 SHA-1: ba845f424964eb9211c87261df7917b837379d46 SHA-256: 23f4a774007e2fc64a2824e5973bb695a64667d8d832fbc29806976dad67d7f7

340 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains critical heuristic firings indicating a VBA UserForm hidden-property command stager, which is a known Emotet delivery technique. The stager utilizes mshta.exe, suggesting it downloads and executes a second-stage payload. The ClamAV detection further supports the Emotet family attribution.

Heuristics 9

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-7577879-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-7577879-0
Reference to mshta.exe high SC_STR_MSHTA

Reference to mshta.exe
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` `258bf5e0ca782b341c9ad5d87ac7e65fd8c0eeac388b421f79070ec47b8758fe`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12060 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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