Backdoor.Win32.PcClient_36fd392be6

by malwarelabrobot on July 7th, 2013 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Worm.Win32.Rebhip.ad (v) (VIPRE), Win32.SuspectCrc!IK (Emsisoft), Backdoor.Win32.PcClient.FD, Trojan.Win32.Bumat.FD, VirusParite.YR (Lavasoft MAS)
Behaviour: Trojan, Backdoor, Worm, Virus


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary
Technical Details
Removal Recommendations

MD5: 36fd392be633cef45d6a7eb3c1472b1d
SHA1: 22b7e998bbdc187216420bcc45c49f1a254acf07
SHA256: 90686d227b585ac524e3d834500a72695ecadf834af41416fab05f726ba44446
SSDeep: 24576:qeCTcYwqa4l4sp4PofQFn/2563ey8gZqj4yYAT2:qeCx3a4/4LC/ qEyYAT2
Size: 875815 bytes
File type: PE32
Platform: WIN32
Entropy: Packed
PEID: UPolyXv05_v6
Company: no certificate found
Created at: 2013-01-03 16:38:53


Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).
Backdoor. Malware that enables a remote control of victim's machine.
Worm. A program that is primarily replicating on networks or removable drives.
Virus. A program that recursively replicates a possibly evolved copy of itself.

Process activity

The Backdoor creates the following process(es):

net1.exe:428
net1.exe:432
36fd392be633cef45d6a7eb3c1472b1d.exe:612
NET.exe:1608
NET.exe:1456
fservice.exe:1308
lncom.exe:600

The Backdoor injects its code into the following process(es):

rundll32.exe:2016

File activity

The process 36fd392be633cef45d6a7eb3c1472b1d.exe:612 makes changes in a file system.
The Backdoor creates and/or writes to the following file(s):

C:\36fd392be633cef45d6a7eb3c1472b1d.jpg (53 bytes)
%System%\lncom_.jpg (6740 bytes)
C:\36FD39~1.EXE.bat (71 bytes)
%System%\lncom.exe (45172 bytes)

The process fservice.exe:1308 makes changes in a file system.
The Backdoor creates and/or writes to the following file(s):

%WinDir%\services.exe (2105 bytes)
%WinDir%\system\sservice.exe (2105 bytes)

The Backdoor deletes the following file(s):

%System%\fservice.exe (0 bytes)
%WinDir%\system\sservice.exe (0 bytes)

The process lncom.exe:600 makes changes in a file system.
The Backdoor creates and/or writes to the following file(s):

%System%\lncom.exe.bat (99 bytes)
%System%\fservice.exe (2105 bytes)
%WinDir%\system\sservice.exe (2105 bytes)

Registry activity

The process net1.exe:428 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9F B1 21 59 FD D9 D2 24 28 80 59 63 2A 91 0E 93"

The process net1.exe:432 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B5 9C 3C 4F 3C 81 A5 70 D6 69 D1 6A 74 5C 93 F5"

The process 36fd392be633cef45d6a7eb3c1472b1d.exe:612 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C8 98 19 6E A9 90 F1 31 32 D9 75 B5 29 33 80 22"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%System%]
"shimgvw.dll" = "Windows Picture and Fax Viewer"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Desktop" = "%Documents and Settings%\%current user%\Desktop"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%System%]
"lncom.exe" = "lncom"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Personal" = "%Documents and Settings%\%current user%\My Documents"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"IntranetName" = "1"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "1"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing proxy to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"

The process NET.exe:1608 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9B 19 C3 85 B7 E7 79 ED FA FE 50 CF 6D 1F 98 E7"

The process NET.exe:1456 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "FA 29 CC C4 52 ED 93 0D F5 FA 4E 50 08 D9 A4 AF"

The process fservice.exe:1308 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "30 91 11 A1 E7 F3 F5 00 50 D7 21 17 91 8F 16 37"

The process lncom.exe:600 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6F 4E BD C8 F0 7A D9 AC 57 98 B4 F2 2E A4 53 FE"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run]
"DirectX For Microsoft® Windows" = "%System%\fservice.exe"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"ICQ_UIN" = "xnt/on,hq/bnl"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"LanNotifie" = ""

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{5Y99AE78-58TT-11dW-BE53-Y67078979Y}]
"StubPath" = "%WinDir%\system\sservice.exe"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Bulas" = "1"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Kurban_Ismi" = "whbuhl"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"XP_FW_Disable" = "1"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"XP_SYS_Recovery" = "1"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Hata" = ""

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Port" = "4001"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Sifre" = "032547"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Mail" = "cnlcdsl`oAx`inn/bnl"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"ICQ_UIN2" = "046007686"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"FW_KILL" = "1"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"Online_List" = "iuuq;..vvv/xntsrhud/bnl.bfh,cho.qsns`u/bfh"

[HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\WinSettings]
"KSil" = "1"

The Backdoor adds the reference to itself to be executed when a user logs on:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"Shell" = "Explorer.exe %System%\fservice.exe"

The process rundll32.exe:2016 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E1 23 DE 83 A0 AB 2F 10 5B AD 62 7A C3 57 0A F9"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

Network activity (URLs)

URL: hxxp://wwwvip.evip.icq.com/friendship/email_thank_you.php?folder_id=18984&params_count=0&nick_name=Pro_Rat&user_email=Pro_Rat@yahoo.com&user_uin=&friend_nickname=&friend_contact=157116797&friend_nickname2=&friend_contact2=&x=60&y=15 Country: Russian Federation
URL: www.yoursite.com IP: 208.87.35.103
URL: mta5.am0.yahoodns.net IP: 66.196.118.33
URL: www.icq.com IP: 178.237.23.237

Rootkit activity

No anomalies have been detected.

Propagation


Remove it with Ad-Aware

  1. Click (here) to download and install Ad-Aware Free Antivirus.
  2. Update the definition files.
  3. Run a full scan of your computer.


Manual removal*

  1. Terminate malicious process(es) (How to End a Process With the Task Manager):

    net1.exe:428
    net1.exe:432
    36fd392be633cef45d6a7eb3c1472b1d.exe:612
    NET.exe:1608
    NET.exe:1456
    fservice.exe:1308
    lncom.exe:600

  2. Delete the original Backdoor file.
  3. Delete or disinfect the following files created/modified by the Backdoor:

    C:\36fd392be633cef45d6a7eb3c1472b1d.jpg (53 bytes)
    %System%\lncom_.jpg (6740 bytes)
    C:\36FD39~1.EXE.bat (71 bytes)
    %System%\lncom.exe (45172 bytes)
    %WinDir%\services.exe (2105 bytes)
    %WinDir%\system\sservice.exe (2105 bytes)
    %System%\lncom.exe.bat (99 bytes)
    %System%\fservice.exe (2105 bytes)

  4. Remove the references to the Backdoor by modifying the following registry value(s) (How to Work with System Registry):

    [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
    "Shell" = "Explorer.exe %System%\fservice.exe"

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Reboot the computer.

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.