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

Static analysis result for SHA-256 6696a5795046caf5…

MALICIOUS

Office (OLE) / .XLS

115.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 40c89fa338c370bdea87401fe717fb8f SHA-1: f3b8c49edf36b124579849e44597a71f21f20203 SHA-256: 6696a5795046caf5f43a68de4814c9793ff05b4ba0f2dda42f81a1f608891050
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2009-3129 indicates exploitation of a Microsoft Excel vulnerability. High-severity heuristics for CreateProcess, LoadLibrary, and GetProcAddress suggest the execution of malicious code. The OLE_APPENDED_PAYLOAD heuristic further indicates that an executable payload was appended to the file, likely dropped and executed by the exploit.

Heuristics 6

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=23, isf=2, cbHdrData=4294967295). Legitimate FEATHEADER records are tiny (<100 bytes) and carry cbHdrData values that fit in the record body; the value here is the documented CVE-2009-3129 exploit primitive — cbHdrData drives a memcpy with attacker-controlled size, leading to memory corruption and code execution in Excel 2007/2003.
  • 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 118,272 bytes but its declared streams total only 24,565 bytes — 93,707 bytes (79%) 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.

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