Win.Trojan.Adnel-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 19574dbaa6174b48…

MALICIOUS

Office (OLE)

347.0 KB Created: 2016-01-19 14:29:00 Authoring application: Microsoft Office Word First seen: 2018-02-07
MD5: ad5a9f34dde97431d6a82eb28b0cadcb SHA-1: 5133d87752c4a10a0233d8f24f7eb3a4f5d95753 SHA-256: 19574dbaa6174b48b79ad210dd4da6ccec72153eb9798b9f0a30ae63dad31a17
144 Risk Score

Malware Insights

Win.Trojan.Adnel-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as Win.Trojan.Adnel-1 by ClamAV. High-severity heuristics indicate an OLE document with a large slack region and an auto-execution of VBA p-code using the 'Shell' command via the 'Document_Open' event. Although VBA macros could not be extracted directly due to an unsupported format, the p-code execution strongly suggests the intent to download and execute a second-stage payload.

Heuristics 5

  • ClamAV: Win.Trojan.Adnel-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Adnel-1
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 355,332 bytes but its declared streams total only 64,670 bytes — 290,662 bytes (82%) 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).
  • 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.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (TypeError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.
  • 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)