MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
The critical heuristic firing indicates that this Excel file exploits CVE-2009-3129, a record overflow vulnerability. This vulnerability allows for arbitrary code execution when the file is opened. The presence of an x86 GetPC stub further supports the likelihood of shellcode execution.
Heuristics 3
-
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=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.
-
x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALLx86 GetPC stub (CALL $+5; POP EDI)
-
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 132,058 bytes but its declared streams total only 24,565 bytes — 107,493 bytes (81%) 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).
Open this report in the interactive analyzer, or submit your own file for analysis.