Worm.Win32.Dorkbot_a8884c420e
HEUR:Trojan.Win32.Generic (Kaspersky), Worm.Win32.Dorkbot (VIPRE), Backdoor.Win32.Ruskill!IK (Emsisoft), Backdoor.Win32.Kelihos.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 (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.
MD5: a8884c420e5f2ce410fa1360dd722b0a
SHA1: 8e134d9e1fe877ac63522e3f47f4877236bbc9a2
SHA256: 585d70e557d1f539c82f437bed15dc6275ee68ca07dd4c1876fb6356f679fe21
SSDeep: 3072:/SvZ Z3RUj6R5/hSIXBJQTU/53eMd5JF1 PcoLLnck462IQH:gKUahra 53eWkPEk462t
Size: 167936 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: Armadillov171, MicrosoftVisualC, MicrosoftVisualCv50v60MFC, MicrosoftVisualC50, UPolyXv05_v6
Company: VirtualDJ
Created at: 2012-04-05 13:30:27
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):
a8884c420e5f2ce410fa1360dd722b0a.exe:1284
2.exe:456
1.exe:364
1.exe:744
The Worm injects its code into the following process(es):
temp135025208.exe:516
File activity
The process 2.exe:456 makes changes in a file system.
The Worm creates and/or writes to the following file(s):
%Documents and Settings%\%current user%\Local Settings\Temp\temp135025208.exe (3909 bytes)
The process temp135025208.exe:516 makes changes in a file system.
The Worm deletes the following file(s):
%Documents and Settings%\%current user%\Local Settings\Temp\tmp.exe (0 bytes)
Registry activity
The process a8884c420e5f2ce410fa1360dd722b0a.exe:1284 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2B A6 1F AE 82 72 47 D4 90 E7 8E B1 86 F6 74 BC"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
The process 2.exe:456 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D0 8C 4A 81 D4 72 7D E8 C6 21 F1 D5 54 FE 2F 0D"
The process temp135025208.exe:516 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D9 09 31 D0 32 15 36 3E 22 28 37 3D E2 77 3D 1E"
[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DMr7ECZt8AEMJY4qik4OMziVoqo tRnMxcO/WdL154xjrpaVOrXNhiqV02lV9zgvkQ=="
[HKCU\Software\Sysinternals\Process Monitor]
"UrlEnabledUse" = "80"
[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"EnableStationQueries" = "1"
[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"ComputerName" = "XP10"
[HKCU\Software\Microsoft\Notepad]
"infoPlayedCurrent" = "00 00 00 00 00 00 00 00"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"
[HKCU\Software\Microsoft\Internet Explorer\Main]
"DBSavedUse" = "A2 49 4D F3 D9 1E 9F 88 01 01 08 61 00 02 01 10"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"
[HKCU\Software\Sysinternals\Process Monitor]
"FlagsModifiedValid" = "00 00 00 00 00 00 00 00"
[HKCU\Software\Microsoft\Notepad]
"styleModifiedPrev" = "80"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
[HKCU\Software\Microsoft\Internet Explorer\Main]
"PlatformCompressedValid" = "00 00 00 00 00 00 00 00"
[HKCU\Software\Microsoft\Internet Explorer\Main]
"PersistentLocalizedName" = "28 80 F9 7F 7A 74 F0 EC BA 96 4A C9 C0 EC 09 56"
[HKCU\Software\Sysinternals\Process Monitor]
"DefaultCompressedRecord" = "28 80 F9 7F 73 6A 65 C0 9D CA C7 F7 5F CB C6 DE"
[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "28 80 F9 7F 87 DE EE E5 C3 F9 22 3C E3 90 BB 4E"
[HKCU\Software\Microsoft\Internet Explorer\Main]
"RecordEnabledCheck" = "80"
[HKCU\Software\Sysinternals\Process Monitor]
"RecordModifiedMax" = "DMr7ECZt8AEMJY4qik4OMziVoqo tRnMxcO/WdL154xjrpaVOrXNhiqV02lV9zgvkQ=="
[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"UserName" = "%CurrentUserName%"
[HKCU\Software\Microsoft\Internet Explorer\Main]
"LineLoadedQuick" = "DMr7ECZt8AEMJY4qik4OMziVoqo tRnMxcO/WdL154xjrpaVOrXNhiqV02lV9zgvkQ=="
To automatically run itself each time Windows is booted, the Worm adds the following link to its file to the system registry autorun key:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"NetworkUpdater" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp135025208.exe"
The process 1.exe:364 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "37 0C 3D 17 49 1D 06 96 D7 C2 22 44 D8 D6 55 63"
The process 1.exe:744 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "76 E6 97 47 8A CC F3 ED AA 71 B9 D9 81 92 65 71"
Network activity (URLs)
| URL | IP |
|---|---|
| hxxp://st4.divshare.com/direct.php?f=24577101&s=75c.res |  208.100.16.112 |
| hxxp://st4.divshare.com/launch.php?f=24577101&s=75c&is_direct=true | |
| hxxp://topcongo.be/site2/images/now.exe (Malicious) |  213.186.33.19 |
| hxxp://91.234.64.114/boris02.exe (Malicious) |  |
Rootkit activity
The Worm installs the following user-mode hooks in WININET.dll:
HttpSendRequestW
InternetWriteFile
HttpSendRequestA
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
NtQueryDirectoryFile
NtEnumerateValueKey
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
- Click (here) to download and install Ad-Aware Free Antivirus.
- Update the definition files.
- Run a full scan of your computer.
Manual removal*
- Scan a system with an anti-rootkit tool.
- Terminate malicious process(es) (How to End a Process With the Task Manager):
a8884c420e5f2ce410fa1360dd722b0a.exe:1284
2.exe:456
1.exe:364
1.exe:744 - Delete the original Worm file.
- Delete or disinfect the following files created/modified by the Worm:
%Documents and Settings%\%current user%\Local Settings\Temp\temp135025208.exe (3909 bytes)
- Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"NetworkUpdater" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp135025208.exe" - Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
- Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
- Reboot the computer.
*Manual removal may cause unexpected system behaviour and should be performed at your own risk.
