Worm.Win32.Dorkbot_e820a4a177

by malwarelabrobot on October 10th, 2013 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.Win32.Injector.slo (v) (VIPRE), Trojan.Win32.Jorik!IK (Emsisoft), Backdoor.Win32.Farfli.FD, Worm.Win32.Dorkbot.FD, GenericUSBInfector.YR, GenericProxy.YR, GenericSYNFlooder.YR, GenericUDPFlooder.YR, GenericDNSBlocker.YR, GenericMSNWorm.YR, GenericIRCBot.YR, GenericAutorunWorm.YR, WormDorkbot.YR, GenericPhysicalDrive0.YR, GenericInjector.YR, BankerGeneric.YR, mzpefinder_pcap_file.YR (Lavasoft MAS)
Behaviour: Banker, Trojan, Backdoor, Flooder, Worm, WormAutorun, IRCBot, MSNWorm, DNSBlocker, UDPFlooder, SYNFlooder, Trojan-Proxy, USBInfector


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: e820a4a1774e9069497b3436e94aeb74
SHA1: a57eacce3e41a1e22da0486ebe5554c59bf745c4
SHA256: 24356070a3b3d86f10837b0dde0e9e075110f7c687c76df2b7bda534f58df19d
SSDeep: 3072:4XhEolPc/EQv36BO7YfITv2xQi9Zl7IXMII4tg:0HPQ6O7YfQri9TIXQ
Size: 126976 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: Armadillov171, MicrosoftVisualC, MicrosoftVisualCv50v60MFC, MicrosoftVisualC50, UPolyXv05_v6
Company: no certificate found
Created at: 2005-02-28 04:31:56


Summary:

Worm. A program that is primarily replicating on networks or removable drives.

Payload

Behaviour Description
WormAutorun A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Worm's file once a user opens a drive's folder in Windows Explorer.
IRCBot A bot can communicate with command and control servers via IRC channel.
MSNWorm A worm can spread its copies through the MSN Messanger.
DNSBlocker A program can block designated DNS servers for making it difficult for users to locate specific domains or web sites on the Internet.
UDPFlooder This program can make a UDP flood. A UDP flood attack is a denial-of-service attack using the User Datagram Protocol (UDP). It can be initiated by sending a large number of UDP packets to random ports on a remote host.
SYNFlooder This program can make a SYN flood. It is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic.
Trojan-Proxy This program can launch a proxy server (SOCKS4) on a designated TCP port.
USBInfector A program can register a device notification with the help of RegisterDeviceNotification. So it is notified when a USB device is plugged and then the worm copies itself to the USB device plugged into the affected computer.


Process activity

The Worm creates the following process(es):

3.exe:1936
1.exe:3076
1.exe:2952
1.exe:2580
e820a4a1774e9069497b3436e94aeb74.exe:2704
2.exe:2700

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

ctfmon.exe:252
3.exe:1576
mspaint.exe:1792

File activity

The process 3.exe:1576 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe (601 bytes)
C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\Desktop.ini (63 bytes)

The process 1.exe:2952 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr (673 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Application Data\temp.bin (673 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\1.exe.gonewiththewings (0 bytes)
%Documents and Settings%\%current user%\Application Data\2.exe.gonewiththewings (0 bytes)

The process mspaint.exe:1792 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\3.exe (98 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Application Data\3.tmp (0 bytes)

Registry activity

The process ctfmon.exe:252 makes changes in a system registry.
The Worm deletes the following value(s) in system registry:
The Worm disables automatic startup of the application by deleting the following autorun value:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"internat.exe"

The process 3.exe:1936 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "15 3B 1D EA 2F B3 0E 14 0C 31 BA C6 76 17 A1 23"

The process 3.exe:1576 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "78 BD 89 5F C6 5F 3C FF 4B EE C9 84 38 36 BB B9"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"Taskman" = "C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe"

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

[HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
"Shell" = "explorer.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe"

To automatically run itself each time Windows is booted, the Worm adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"3aaa0" = "C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe"

The process 1.exe:3076 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4B 49 00 20 FB FB B2 1D 6D 80 56 0F 52 A9 92 07"

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

The process 1.exe:2952 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5E 46 E4 A9 43 58 60 99 CE BE 3D DD 0F B7 F7 80"

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

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

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

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

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "46 00 00 00 42 00 00 00 01 00 00 00 00 00 00 00"

The Worm 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"

To automatically run itself each time Windows is booted, the Worm adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Screen Saver Pro 3.1" = "%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr"

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

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

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Worm deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyServer"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyOverride"

The process 1.exe:2580 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "1C 4D 4D 02 AF 16 B6 9A 5E 4E C5 F5 48 FE EE B0"

The process mspaint.exe:1792 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "00 87 0C 04 59 5F CC 51 41 7A F9 6A 28 18 24 C8"

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

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

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

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

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "46 00 00 00 44 00 00 00 01 00 00 00 00 00 00 00"

The Worm 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 Worm 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"

To automatically run itself each time Windows is booted, the Worm adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Upwiwc" = "%Documents and Settings%\%current user%\Application Data\Microsoft\Upwiwc.exe"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Worm 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 Worm deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyServer"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyOverride"

The process e820a4a1774e9069497b3436e94aeb74.exe:2704 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C8 FE F2 E9 00 52 F9 A3 88 1F 3F F9 77 F6 44 AA"

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

The process 2.exe:2700 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AD 72 50 9B 86 FC 5D B1 51 DD 71 F3 23 2F 7B 2F"

Network activity (URLs)

URL IP
hxxp://144.76.169.105/65333.exe (Malicious)
hxxp://37.139.31.188/65333.exe (Malicious)
hxxp://69.197.137.58/
hxxp://188.64.172.15/30003.exe (Malicious)
t.k201333.com 116.255.159.101
a.zabreefikk.com 116.255.159.101
a.tanikai.com Unresolvable
api.wipmania.com.stcus.ru Unresolvable


Rootkit activity

The Worm installs the following user-mode hooks in urlmon.dll:

URLDownloadToFileA
URLDownloadToFileW

The Worm installs the following user-mode hooks in WININET.dll:

InternetWriteFile
HttpSendRequestA
HttpSendRequestW

The Worm installs the following user-mode hooks in dnsapi.dll:

DnsQuery_A
DnsQuery_W

The Worm installs the following user-mode hooks in WS2_32.dll:

send
GetAddrInfoW

The Worm installs the following user-mode hooks in kernel32.dll:

MoveFileA
CopyFileW
CopyFileA
MoveFileW
CreateFileW
CreateFileA

The Worm installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtResumeThread
ZwQueryDirectoryFile
ZwEnumerateValueKey

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Worm's file once a user opens a drive's folder in Windows Explorer.
A program can register a device notification with the help of RegisterDeviceNotification. So it is notified when a USB device is plugged and then the worm copies itself to the USB device plugged into the affected computer.
A worm can spread its copies through the MSN Messanger.


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. Scan a system with an anti-rootkit tool.
  2. Terminate malicious process(es) (How to End a Process With the Task Manager):

    3.exe:1936
    1.exe:3076
    1.exe:2952
    1.exe:2580
    e820a4a1774e9069497b3436e94aeb74.exe:2704
    2.exe:2700

  3. Delete the original Worm file.
  4. Delete or disinfect the following files created/modified by the Worm:

    C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe (601 bytes)
    C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\Desktop.ini (63 bytes)
    %Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr (673 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Application Data\temp.bin (673 bytes)
    %Documents and Settings%\%current user%\Application Data\3.exe (98 bytes)

  5. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "3aaa0" = "C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe"

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "Screen Saver Pro 3.1" = "%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr"

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "Upwiwc" = "%Documents and Settings%\%current user%\Application Data\Microsoft\Upwiwc.exe"

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

    [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
    "Shell" = "explorer.exe,C:\RECYCLER\S-1-5-21-0243556031-888888379-781863308-41010\3aaa10.exe"

  7. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  8. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  9. Reboot the computer.

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

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