Thursday, May 13, 2010

Malware files rasauto16.dll and rasauto32.dll Remote Access Auto Connection Manager service - Backdoor

Update May 13 - added Rasauto32.dll

rasauto16.dll

Download 
rasauto16.dll 15138604260b1d27f92bf1ec6468b326 +
rasauto16.dll 80ca8b948409138be40ffbc5d6d95ef1 

Also, rasauto32.dll  995b44ef8460836d9091a8b361fde489 

  ac as a password protected archives (please contact me for the password if you need it)

Variant 1


File rasauto16.dll received on 2010.05.10 17:00:18 (UTC)
http://www.virustotal.com/analisis/bb1116f23874a36b0de47af8441c55687ccdcb0bad11384ab3718053f8eb7574-1273510818
Current status: finished
Result: 3/41 (7.32%)
Result: 3/41 (7.32%)
DrWeb    5.0.2.03300    2010.05.10    BACKDOOR.Trojan - yes, it is a backdoor and was used as such
McAfee-GW-Edition    2010.1    2010.05.10    Heuristic.BehavesLike.Win32.Backdoor.H
PCTools    7.0.3.5    2010.05.10    Trojan.Conficker.c.gen  --I don't think so.
Additional information
File size: 107008 bytes
MD5   : 15138604260b1d27f92bf1ec6468b326
SHA1  : 7cd0faddaf926573be91f725b07865c14dd44254
SHA256: bb1116f23874a36b0de47af8441c55687ccdcb0bad11384ab3718053f8eb7574
PEInfo: PE Structure information
entrypointaddress.: 0x12B83
timedatestamp.....: 0x4B566B52 (Wed Jan 20 03:32:50 2010)


 file dated just like other files on the system

rasauto16.dll replaces legitimate rasauto.dll

Rasauto
Service description:
Remote Access Auto Connection Manager
Creates a connection to a remote network whenever a program references a remote DNS or NetBIOS name or address.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasAuto\Parameters
ServiceDll %SystemRoot%\System32\rasauto16.dll

TCP traffic

 202.175.83.10:443
z83l10.static.ctm.net
ISP:CTM Internet Services
Organization:CTM Internet Services
Country:Macau
City:Macau
address: Rua da Lagos, Telecentro
address: P.O. Box 868, Taipa
address: Macau
country: MO


Variant 2


http://www.virustotal.com/analisis/0de9fe6378a4c024f6f2c81b300897b8978d036caafbae9902850870d8f4dc04-1273511085
File rasauto16.dll received on 2010.05.10 17:04:45 (UTC)
Result: 4/41 (9.76%)
AntiVir    8.2.1.236    2010.05.10    TR/Spy.Gen
Comodo    4816    2010.05.10    ApplicUnwnt.Win32.AdWare.EZula.~GGC
McAfee-GW-Edition    2010.1    2010.05.10    Heuristic.BehavesLike.Win32.Backdoor.H
Sophos    4.53.0    2010.05.10    Mal/Emogen-Y
Additional information
File size: 669696 bytes
MD5...: 80ca8b948409138be40ffbc5d6d95ef1
SHA1..: f54b24660ec8664280e999e44148457e15f5489a
SHA256: 0de9fe6378a4c024f6f2c81b300897b8978d036caafbae9902850870d8f4dc04
ssdeep: 12288:CqjmOwFjklKkoTDLa77d46+HkQIwAy0WTuzjOFE:XjNwVxkofLFTjIyXTu
3O
entrypointaddress.: 0x22b03
timedatestamp.....: 0x4b679e56 (Tue Feb 02 03:39:02 2010)
machinetype.......: 0x14c (I386)

Creation and modified dates - 8/4/2004 8:00 am


rasauto16.dll replaces legitimate rasauto.dll

Rasauto
Service description:
Remote Access Auto Connection Manager
Creates a connection to a remote network whenever a program references a remote DNS or NetBIOS

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasAuto\Parameters
ServiceDll %SystemRoot%\System32\rasauto16.dll



Variant 3

Rasauto32.dll 
File rasauto32.dll received on 2010.05.13 16:19:29 (UTC)
http://www.virustotal.com/analisis/4da40b63c4027db5fb02e37db78da7333144809d1ddf0c86442e12d28cd7c47c-1273767569
Result: 12/41 (29.27%)
AntiVir    8.2.1.242    2010.05.13    TR/Spy.Gen
Antiy-AVL    2.0.3.7    2010.05.13    Trojan/Win32.Agent.gen
Avast    4.8.1351.0    2010.05.13    Win32:Malware-gen
Avast5    5.0.332.0    2010.05.13    Win32:Malware-gen
AVG    9.0.0.787    2010.05.13    Agent2.AMWN
GData    21    2010.05.13    Win32:Malware-gen
Jiangmin    13.0.900    2010.05.13    Trojan/Agent.drkq
Kaspersky    7.0.0.125    2010.05.13    Trojan.Win32.Agent.dnwh
Panda    10.0.2.7    2010.05.12    Suspicious file
Sophos    4.53.0    2010.05.13    Troj/RasSpy-Gen
TheHacker    6.5.2.0.280    2010.05.13    Trojan/Agent.dnwh
VBA32    3.12.12.4    2010.05.13    Trojan.Win32.Agent.dnwh
Additional information
File size: 647168 bytes
MD5...: 995b44ef8460836d9091a8b361fde489







TCP traffic

202.153.103.83:443
Hostname:beta.nethost.hk
ISP:TaiKoo Place, Quarry Bay
Organization: TaiKoo Place, Quarry Bay
Country:Hong Kong
City:Central District

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