MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious File
T1204.002 Malicious File: Malicious Attachment
T1059 Command and Scripting Interpreter
T1059.003 Command and Scripting Interpreter: Windows Command Shell
T1059.001 Command and Scripting Interpreter: PowerShell
The critical heuristic firing for CVE-2009-3129 indicates that this Excel file is designed to exploit a buffer overflow vulnerability. The presence of references to VirtualProtect, LoadLibrary, and GetProcAddress APIs strongly suggests that the exploit is used to load and execute arbitrary code, likely a second-stage payload. The large slack space in the OLE structure is also indicative of a packed or obfuscated payload. The file is therefore classified as malicious, likely a downloader or dropper.
Heuristics 5
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CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=22, isf=4, cbHdrData=4). 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.
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Reference to LoadLibrary API high SC_STR_LOADLIBRARYReference to LoadLibrary API
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Reference to GetProcAddress API high SC_STR_GETPROCADDRESSReference to GetProcAddress API
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 66,048 bytes but its declared streams total only 24,565 bytes — 41,483 bytes (63%) 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).
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Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECTReference to VirtualProtect API
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