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

Static analysis result for SHA-256 faeb21b9af218d5c…

MALICIOUS

Office (OLE) / .DOC

139.2 KB Created: 2006-01-25 08:30:00 Authoring application: Microsoft Office Word
MD5: 0cf434a5eb651ef3bbb95514b43de1d5 SHA-1: c323689adb85930a0c033d488601b236f634be9a SHA-256: faeb21b9af218d5c74d6746e747d94ce66a7ebcca9459e8b6026d54faf5aa5e7
320 Risk Score

Malware Insights

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

The sample exhibits high-confidence heuristics related to process injection (WriteProcessMemory, CreateRemoteThread) and dynamic execution (CreateProcess, VirtualAlloc, VirtualProtect, GetProcAddress). The presence of a large slack space anomaly in the OLE structure is also noted. These indicators suggest the document is designed to download and execute a second-stage payload, likely exploiting a vulnerability to achieve this. No specific family could be identified.

Heuristics 8

  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • x86 GetPC stub (CALL $+5; POP EAX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EAX)
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess 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 142,508 bytes but its declared streams total only 21,151 bytes — 121,357 bytes (85%) 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
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API

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