Worm.Win32.Dorkbot_fd372fe727

by malwarelabrobot on July 14th, 2013 in Malware Descriptions.

Trojan.Win32.Jorik.Nrgbot.puq (Kaspersky), Artemis!FD372FE72751 (McAfee), WS.Reputation.1 (Symantec), Trojan.Win32.Jorik (Ikarus), Worm.Win32.Dorkbot.FD, BankerGeneric.YR, GenericInjector.YR, GenericPhysicalDrive0.YR, WormDorkbot.YR, GenericAutorunWorm.YR, GenericIRCBot.YR, GenericMSNWorm.YR, GenericDNSBlocker.YR, GenericUDPFlooder.YR, GenericSYNFlooder.YR, GenericProxy.YR, GenericUSBInfector.YR (Lavasoft MAS)
Behaviour: Banker, Trojan, 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: fd372fe72751d8214307e3ef1b59803d
SHA1: e2d58b02ea67756bc8e5e5f47ca0730372a3dea1
SHA256: 253dc9f382114729cc1a9566cff96bca963a966cfdc20c98a838f7bb94fa4225
SSDeep: 3072:y0qhTTVY1zQvXBGzHAl3HO6xkHFeKG9vkBPVNO39pnrcEAjUBBjaMW75:yTl3HvqtBmpQjInb
Size: 167936 bytes
File type: PE32
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualBasicv50v60; UPolyXv05_v6
Company: no certificate found
Created at: 2013-07-01 19:26:07


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):

fd372fe72751d8214307e3ef1b59803d.exe:1008
fd372fe72751d8214307e3ef1b59803d.exe:956

File activity

Registry activity

The process fd372fe72751d8214307e3ef1b59803d.exe:1008 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "38 48 E2 29 76 9C 04 9F 12 73 22 31 26 73 F7 CB"

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

The process fd372fe72751d8214307e3ef1b59803d.exe:956 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "12 1D B0 F7 30 19 0D 35 B7 24 B9 80 65 6F DD 4F"

Network activity (URLs)

No activity has been detected.

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

  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):

    fd372fe72751d8214307e3ef1b59803d.exe:1008
    fd372fe72751d8214307e3ef1b59803d.exe:956

  3. Delete the original Worm file.
  4. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  5. Reboot the computer.

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