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

Static analysis result for SHA-256 5d68390e304167bc…

MALICIOUS

Office (OLE) / .DOC

195.8 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: cf15a6643f4b8be306c11c155e37dc1c SHA-1: c61da9dbeb083aceec1917ce62c3be31b7d6dad7 SHA-256: 5d68390e304167bc13fe847f2fd253f3f510b95dfdcbd427313dc4214af2c545
342 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a malicious Microsoft Word document exploiting CVE-2006-6456, indicated by critical heuristic firings. It contains an embedded PE executable and references to Windows API functions like VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting it's designed to load and execute a secondary payload. The document also contains password instructions, a common lure for password-protected archives, further supporting the malicious intent.

Heuristics 9

  • CVE-2006-6456 — Microsoft Word malformed table SPRM critical CVE exact CVE_2006_6456
    WordDocument contains a malformed table border-color SPRM in the CVE-2006-6456 shape: a valid table-SPRM cluster is followed by an invalid high-byte 0xFF SPRM where Word expects a normal sprmTBrc*Cv record. Vulnerable Word 2000/2002/2003 parsers corrupt memory while handling this malformed data structure.
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • 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 200,452 bytes but its declared streams total only 94,801 bytes — 105,651 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_0001c600.exe
a12476b93b619585603e0cf99bb3362225ee7f08136c6d6971b750b9c718030d		 embedded-pe Office MZ+PE at offset 0x1C600 84228 bytes

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