diff --git a/algorithms/sdbm_65599_x64.py b/algorithms/sdbm_65599_x64.py
new file mode 100644
index 0000000..8c66c88
--- /dev/null
+++ b/algorithms/sdbm_65599_x64.py
@@ -0,0 +1,10 @@
+DESCRIPTION = "The original SDBM hash function with the constant 65599. Used by Emotet malware."
+TYPE = 'unsigned_long'
+TEST_1 = 18326187587583583519
+
+
+def hash(data):
+    hsh = 0
+    for d in data:
+        hsh = d + 0x1003f * hsh
+    return hsh & 0xffffffffffffffff