Emotet Office (OLE) malware analysis — malicious · 8c82b0bdf0879bf6

MALICIOUS

Office (OLE)

79.2 KB Created: 2018-11-08 23:11:00 Authoring application: Microsoft Office Word First seen: 2019-08-04

MD5: ae5373d974015f8cc2b74d75878b21d2 SHA-1: b5b212bac1ba81a740dcd9e5b50e6c5b7adb0108 SHA-256: 8c82b0bdf0879bf64a5182d33332b2ba500e2c24df7ca7dc14d529486c300e3d

182 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This document contains a critical ClamAV detection for Emotet, a known banking trojan. The heuristics indicate the presence of PowerShell commands and a LOLBin execution attempt using CMD. The embedded PowerShell command decodes and decompresses a Base64 string, likely to download and execute a second-stage payload. This is consistent with Emotet's typical behavior of acting as a downloader for other malware.

Heuristics 5

ClamAV: Doc.Dropper.Emotet-6769504-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Emotet-6769504-0
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 81,152 bytes but its declared streams total only 48,195 bytes — 32,957 bytes (41%) 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).
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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 In document text (OLE body)

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