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

Static analysis result for SHA-256 992c89fb9d4b38dc…

MALICIOUS

Office (OLE) / .DOC

300.5 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 85186f8eb238a68174719c3c505dc852 SHA-1: e09ebcd81abb5d5da02505dbaf9caff54c59ccd5 SHA-256: 992c89fb9d4b38dce8b3131a6b56541104638d95626c8a9e8e2b1a12e7440895
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1055.012 Process Hollowing T1055.001 Process Injection T1055.002 Class Injection

The sample exhibits high-confidence heuristic firings related to process injection (WriteProcessMemory) and remote thread creation (CreateRemoteThread), strongly indicating an attempt to execute arbitrary code. References to WinExec, CreateProcess, VirtualAlloc, and LoadLibrary further support this. The OLE slack anomaly suggests the presence of hidden or obfuscated data within the document. No specific malware family could be confidently identified.

Heuristics 9

  • 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 CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess 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 307,712 bytes but its declared streams total only 94,801 bytes — 212,911 bytes (69%) 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://schemas.openxmlformats.org/drawingml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

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