Plenty of people code rat's and other malware in vb.net or delphi but this guide should give you the fundamentals in C++ networking to be able to code your own tools. It's not a short read but C++ is not an easy language to learn....

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[spoiler=AV scan]Antivirus results
AhnLab-V3 - 2010.10.24.00 - 2010.10.23 - -
AntiVir - 7.10.13.27 - 2010.10.22 - -
Antiy-AVL - 2.0.3.7 - 2010.10.24 - -
Authentium - 5.2.0.5 - 2010.10.23 - -
Avast - 4.8.1351.0 - 2010.10.24 - -
Avast5 - 5.0.594.0 - 2010.10.24 - -
AVG - 9.0.0.851 - 2010.10.24 - -
BitDefender - 7.2 - 2010.10.24 - -
CAT-QuickHeal - 11.00 - 2010.10.22 - -
ClamAV - 0.96.2.0-git - 2010.10.23 - -
Comodo - 6488 - 2010.10.23 - -
DrWeb - 5.0.2.03300 - 2010.10.24 - -
Emsisoft - 5.0.0.50 - 2010.10.24 - -
eSafe - 7.0.17.0 - 2010.10.24 - -
eTrust-Vet - 36.1.7929 - 2010.10.22 - -
F-Prot - 4.6.2.117 - 2010.10.23 - -
F-Secure - 9.0.16160.0 - 2010.10.24 - -
Fortinet - 4.2.249.0 - 2010.10.24 - -
GData - 21 - 2010.10.24 - -
Ikarus - T3.1.1.90.0 - 2010.10.24 - -
Jiangmin - 13.0.900 - 2010.10.24 - -
K7AntiVirus - 9.66.2813 - 2010.10.22 - -
Kaspersky - 7.0.0.125 - 2010.10.24 - -
McAfee - 5.400.0.1158 - 2010.10.24 - -
McAfee-GW-Edition - 2010.1C - 2010.10.24 - -
Microsoft - 1.6301 - 2010.10.24 - -
NOD32 - 5560 - 2010.10.24 - -
Norman - 6.06.10 - 2010.10.24 - -
nProtect - 2010-10-24.01 - 2010.10.24 - -
Panda - 10.0.2.7 - 2010.10.24 - -
PCTools - 7.0.3.5 - 2010.10.24 - -
Prevx - 3.0 - 2010.10.24 - -
Rising - 22.70.05.00 - 2010.10.24 - -
Sophos - 4.58.0 - 2010.10.24 - -
Sunbelt - 7131 - 2010.10.24 - -
SUPERAntiSpyware - 4.40.0.1006 - 2010.10.24 - -
Symantec - 20101.2.0.161 - 2010.10.24 - -
TheHacker - 6.7.0.1.065 - 2010.10.24 - -
TrendMicro - 9.120.0.1004 - 2010.10.24 - -
TrendMicro-HouseCall - 9.120.0.1004 - 2010.10.24 - -
VBA32 - 3.12.14.1 - 2010.10.22 - -
ViRobot - 2010.10.24.4110 - 2010.10.24 - -
VirusBuster - 12.70.2.0 - 2010.10.24 - -
File info:
MD5: c5d06b114b56d2b86639e2ab6a3bffc7
SHA1: 5a747c8b90f0f7b499840b195fef0c00b3b6d328
SHA256: e5cfe9ec0e22e9aac7492d29b9440f0a3dce094535bbb5e8718848536606787a
File size: 738252 bytes
Scan date: 2010-10-24 17:23:57 (UTC)[/spoiler]