Worm.Win32.Dorkbot_297a92f42e

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

Trojan-Downloader.Win32.Adload.ajqr (Kaspersky), Worm.Win32.Dorkbot (VIPRE), Trojan-Downloader.Win32.Adload!IK (Emsisoft), 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: Trojan-Downloader, 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: 297a92f42e84ea446b829c0b11fca8d4
SHA1: 7f47b06c6b8ab6d4521411f3937cca0d7a60bcbb
SHA256: d473b095cba361fe34939de109064cdc3e3f531d621cc92cbddcf49df1530da8
SSDeep: 6144:E8Xl61yGSGTWymaJy qO3m2OGtOGaaDWaayhKeiLe9dgl 7Qkw zDCs0EO:E890dglVs0E
Size: 319488 bytes
File type: PE32
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualC; Armadillov171; MicrosoftVisualCv50v60MFC; MicrosoftVisualC50; UPolyXv05_v6
Company: SetupManager
Created at: 2007-09-21 02:48:34


Summary:

Trojan-Downloader. Trojan program, which downloads files from the Internet without user's notice and executes them.
Banker. Steals data relating to online banking systems, e-payment systems and credit card systems.
WormAutorun. A worm spreads 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 communicates with command and control servers via IRC channel.
MSNWorm. A worm spreads its copies through the MSN Messanger.
DNSBlocker. A program blocks 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 registers 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):

297a92f42e84ea446b829c0b11fca8d4.exe:1688
Xtkmkj.exe:1736

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

File activity

The process 297a92f42e84ea446b829c0b11fca8d4.exe:1688 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Xtkmkj.exe (1425 bytes)

Registry activity

The process 297a92f42e84ea446b829c0b11fca8d4.exe:1688 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 0E 3E 6E 46 E2 C7 DF DA 70 CE 38 8E 8D 29 03"

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

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]
"Xtkmkj" = "%Documents and Settings%\%current user%\Application Data\Xtkmkj.exe"

The process Xtkmkj.exe:1736 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6E C5 1E B2 62 E5 A4 EC 79 6E 9F CC 2F AD 79 2F"

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

Network activity (URLs)

A bot communicates with command and control servers via IRC channel.
This program can launch a proxy server (SOCKS4) on a designated TCP port.
A program blocks designated DNS servers for making it difficult for users to locate specific domains or web sites on the Internet.
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.
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.

URL: hxxp://146.185.246.25/6516.exe Country: Russian Federation Verdict: Malicious
URL: ng.grasshopperz11.com IP: 59.51.114.85

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 ADVAPI32.dll:

RegCreateKeyExA
RegCreateKeyExW

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 spreads 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 registers 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 spreads 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):

    297a92f42e84ea446b829c0b11fca8d4.exe:1688
    Xtkmkj.exe:1736

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

    %Documents and Settings%\%current user%\Application Data\Xtkmkj.exe (1425 bytes)

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

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

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

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