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

Static analysis result for SHA-256 c419c1754f988fa0…

MALICIOUS

Office (OLE) / .DOC

172.0 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 5430ec1f0b6fbd8183f06a612e5efe64 SHA-1: 905c2fdff2238cef1aaede00f52dc37d887ad964 SHA-256: c419c1754f988fa0f2068058d0bf40bf8accef2d71138b1b21fb4059849d36a4
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1059.001 PowerShell T1218 System Binary Proxy Execution T1071 Application Layer Protocol T1055 Process Injection

The sample exhibits high-confidence heuristic firings indicating the use of critical Windows API functions for code execution and process manipulation, including WinExec, CreateProcess, LoadLibrary, and GetProcAddress. The suspicious invocation of cmd.exe with an execution flag further suggests the execution of arbitrary commands. The OLE slack anomaly indicates potential obfuscation or padding within the document structure. While no specific URLs or scripts were extracted, the API calls strongly suggest the document is designed to download and execute a second-stage payload.

Heuristics 7

  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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 176,128 bytes but its declared streams total only 94,801 bytes — 81,327 bytes (46%) 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

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