Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 77ad3972ac0fec62…

MALICIOUS

Office (OLE)

79.4 KB Created: 2018-11-08 11:05:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: c3e99fad6ded81733ee794ee42e4c618 SHA-1: 40fe1978a9fb5003be04ccf60553fc6b55487282 SHA-256: 77ad3972ac0fec62d652ea413888cd4f650b80694dbb29837f7760e9b5b2bf62
222 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file exhibits characteristics of the Emotet family, including a critical ClamAV detection. It contains a PowerShell command embedded within the document body that is designed to decompress and execute a Base64 encoded string. This script likely downloads and executes a second-stage payload, a common tactic for Emotet.

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 81,280 bytes but its declared streams total only 47,738 bytes — 33,542 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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