Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a25f9a88eba78e30…

MALICIOUS

Office (OLE)

79.1 KB Created: 2018-11-06 17:33:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: ee9b784bf08228da8cd8c534655bd7e7 SHA-1: 976795974793c62744893e18436f997598b0ada7 SHA-256: a25f9a88eba78e303850ef818bffeff8fce4d5a596ff048d2f572eba1672f096
222 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The file exhibits characteristics of the Emotet malware family, as indicated by ClamAV detection and suspicious PowerShell and cmd.exe invocations. The embedded obfuscated PowerShell command is designed to download and execute a second-stage payload, likely for further malicious activity. The large slack space in the OLE structure is also a common indicator for packed or obfuscated malware.

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 81,024 bytes but its declared streams total only 48,126 bytes — 32,898 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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