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

Static analysis result for SHA-256 9195f32ad9b747a3…

MALICIOUS

Office (OLE) / .XLS

238.7 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 524ab465fdf0de879e729280079f7b90 SHA-1: 4d85a37dc5a625075ee295d62bbf278e5e2a890a SHA-256: 9195f32ad9b747a38efea0aa411d60f2a14d4b7ea68f692261dbc5b46b2c806b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1027 Obfuscated Files or Information

The sample is an Excel file with a high percentage of slack space, indicating potential obfuscation. A critical heuristic identified XOR-encoded strings with a key of 0x48, suggesting an attempt to hide malicious content. Without further script or body content, the exact payload and delivery mechanism remain unclear, but the obfuscation points to a downloader or dropper.

Heuristics 2

  • XOR-encoded strings (key 0x48) critical SC_XOR_ENCODED
    Found 8 Windows library/API name(s) XOR-encoded with single-byte key 0x48: 'LoadLibraryA', 'GetProcAddress', 'VirtualAlloc', 'VirtualProtect', 'CreateProcessA', 'ExitProcess', 'CreateFileA', 'RegOpenKeyExA'
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 244,404 bytes but its declared streams total only 24,565 bytes — 219,839 bytes (90%) 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.