Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 8e3dace299f88439…

MALICIOUS

Office (OLE)

80.9 KB Created: 2018-11-08 03:58:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 4666b7438ec51d501e68b4fc45b69bfc SHA-1: 42868f56af38ada1ec1ca69438ce1268ab0f734f SHA-256: 8e3dace299f8843950c6f86ceb16c99ec1fa6e4b6647d8c494f88fe9ae04a5e7
222 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This document was detected as Emotet, a known malware family. It contains a complex command that leverages both CMD and PowerShell to download and execute a second-stage payload. The script decodes a Base64 string and uses it to construct a PowerShell command, which then sets an environment variable and executes further commands.

Heuristics 6

  • ClamAV: Doc.Dropper.Emotet-6769504-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Emotet-6769504-0
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 82,816 bytes but its declared streams total only 48,155 bytes — 34,661 bytes (42%) 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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