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

Static analysis result for SHA-256 ca6c6ec9760a6abe…

MALICIOUS

Office (OLE) / .DOC

213.1 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: a2764af951da08b68fe1cb51e03fbf69 SHA-1: f584caa5d8f534bbb124404c1d9b0049cd071ab3 SHA-256: ca6c6ec9760a6abe1adb30e959e2779d4389640ffc975a3505e6378ba796556c
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1055 Process Injection T1105 Ingress Tool Transfer

The sample is an OLE document with a significant slack space anomaly and an embedded PE executable. Heuristics indicate the use of critical Windows API functions such as WriteProcessMemory and CreateRemoteThread, commonly used for process injection. The presence of an embedded executable strongly suggests the document is a dropper designed to execute a malicious payload. No scripts were extracted, limiting further analysis of the payload's specific behavior.

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 218,185 bytes but its declared streams total only 94,801 bytes — 123,384 bytes (57%) 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).
  • Embedded PE executable high OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API

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