Emotet Office (OLE) / .DOC malware analysis — malicious · 85cccc1cadaf454f

MALICIOUS

Office (OLE) / .DOC

232.6 KB Created: 2020-09-30 05:26:00 Authoring application: Microsoft Office Word

MD5: 1fccd3b28efb89cd0e008a035e484246 SHA-1: 79cf866cbb29ac527fe3f94b8e57cf3b2436a627 SHA-256: 85cccc1cadaf454f933e46c59fb5a9aae41db9904f2c5a37fd314296d9f86703

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is identified as malicious by ClamAV with a signature indicating it's an Emotet downloader. Static analysis reveals a Document_Open VBA macro that utilizes CreateObject, a common technique for executing malicious code. The macro's p-code indicates auto-execution and the use of CreateObject, strongly suggesting it's designed to download and run a secondary payload. The obfuscated document body text does not provide further context on the lure.

Heuristics 8

ClamAV: Doc.Downloader.Emotet-9769541-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet-9769541-0
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 238,199 bytes but its declared streams total only 117,011 bytes — 121,188 bytes (51%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
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` `b2b495189d2eb2b89dce9719098105d933c1125fa9413aec5a7ff49e851b8844`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	10579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 28 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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