Malicious Office (OLE) / .SEN — malware analysis report

Static analysis result for SHA-256 c3225c9ddc4f162b…

MALICIOUS

Office (OLE) / .SEN

55.8 KB Created: 2005-06-29 18:14:00 Authoring application: Microsoft Word 10.0
MD5: 9df15441b5c349a57649549256252e29 SHA-1: 3d9606d35f1bffbfe7b6329677fd10bbf59e122b SHA-256: c3225c9ddc4f162b253c808e15d6ded6eddf6636c7593031c5590453872499af
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1105 Ingress Tool Transfer T1055 Process Injection T1059.003 Windows Command Shell

The sample contains references to WinExec, ShellExecute, URLDownloadToFile, VirtualAlloc, WriteProcessMemory, CreateRemoteThread, LoadLibrary, and GetProcAddress APIs, indicating a sophisticated payload execution mechanism. The embedded URL http://www.dnk.net.id/supporthelp1.tmp is likely used to download and execute a secondary stage. The OLE slack anomaly suggests potential obfuscation or padding within the document structure.

Heuristics 10

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 57,122 bytes but its declared streams total only 20,632 bytes — 36,490 bytes (64%) 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).
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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://www.dnk.net.id/supporthelp1.tmp In document text (OLE body)

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