Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b50dd48ba579dbc9…

MALICIOUS

Office (OLE)

198.5 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 03bd5b78eb177d7eaf59dd58dfad30b0 SHA-1: 5546031f01fc6313c781da9a5e9b9c289a41ef5e SHA-256: b50dd48ba579dbc9fd8fd06105b305d1fd47808d5210c9a530854c07b70c85c8
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1055.012 Process Hollowing

The sample exhibits high-confidence heuristic firings related to the execution of external processes and dynamic library loading, including WinExec, CreateProcess, and LoadLibrary. The presence of suspicious cmd.exe invocation further suggests the execution of arbitrary commands. While no document body text was available for content analysis, the combination of these API calls strongly indicates an attempt to download and execute a second-stage payload. The OLE slack anomaly suggests potential obfuscation or padding within the file structure.

Heuristics 8

  • 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 203,264 bytes but its declared streams total only 94,801 bytes — 108,463 bytes (53%) 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://crd-net.org/Article/Class9/Class10/201002/20100210232045_19884.html
    • http://www.internationalpen.org.uk/
    • http://asiapacific.ifj.org/en/articles/ifj-condemns-sentencing-of-sichuan-writer

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