Gen.Variant.Graftor.814_f3a8a95ff2

Dynamic Analysis

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 Trojan'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 Trojan creates the following process(es):

imapi.exe:824
%original file name%.exe:1708
%original file name%.exe:1280
%original file name%.exe:1196
drwtsn32.exe:1324
Ctkmko.exe:676
Ctkmko.exe:564
Ctkmko.exe:1356

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

mscorsvw.exe:1920
rundll32.exe:492

Mutexes

The following mutexes were created/opened:No objects were found.

File activity

The process imapi.exe:824 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%WinDir%\Temp\fwjtntz6.TMP (146970 bytes)

The process %original file name%.exe:1708 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Ctkmko.exe (673 bytes)

The process %original file name%.exe:1196 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-1844237615-1960408961-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_75ed9567-aa58-4c8e-a8ea-3cad7c47ab03 (44 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\EtfDtg1eKDiK6AhE6Jl.tmp (3 bytes)

The process drwtsn32.exe:1324 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\All Users\Application Data\Microsoft\Dr Watson\user.dmp (183728 bytes)
%Documents and Settings%\All Users\Application Data\Microsoft\Dr Watson\drwtsn32.log (389686 bytes)

The process Ctkmko.exe:676 makes changes in the file system.

The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\EtfDtg1eKDiK6AhE6Jl.tmp (3 bytes)

Registry activity

The process imapi.exe:824 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D6 14 BC 8D B6 6A 65 E9 D9 0C D0 68 A4 F9 C5 70"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi]
"ControlFlags" = "1"
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc]
"BitNames" = " ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi]
"LogSessionName" = "stdout"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc]
"Guid" = "8107d8e9-e323-49f5-bba2-abc35c243dca"

The process rundll32.exe:492 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "03 C1 D4 C3 D7 9E 62 54 DA 86 29 4B B8 A9 70 C6"

[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"

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

The process %original file name%.exe:1708 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7C 53 6E D6 63 15 75 3F 8E 86 E5 85 4B D9 FD AD"

[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 Trojan adds the following link to its file to the system registry autorun key:

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

The process %original file name%.exe:1280 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C6 7C B3 4B 2F 04 74 03 8C F9 6A A0 7B B5 9F A1"

The process %original file name%.exe:1196 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2B 99 17 57 45 97 8C 72 02 C7 80 9F 90 84 4F F8"

The process drwtsn32.exe:1324 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A8 92 99 76 C6 F1 53 C9 EA 33 7D 9D A3 1F 40 17"

[HKLM\SOFTWARE\Microsoft\DrWatson]
"NumberOfCrashes" = "1"

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

The process Ctkmko.exe:676 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "12 75 9C 44 87 BC BB 3F DE F3 44 D6 1B 46 F1 8B"

The process Ctkmko.exe:564 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "49 6E CC 62 DE A4 90 81 56 2C C9 BB EE BA E3 A6"

The process Ctkmko.exe:1356 makes changes in the system registry.

The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AD A4 05 29 62 59 95 ED A5 4C 24 5E 61 1F DF 45"

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

Dropped PE files

MD5	File path
38d6eb5672a223ab464dfd0e356738d7	c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\EtfDtg1eKDiK6AhE6Jl.tmp

HOSTS file anomalies

No changes have been detected.

Rootkit activity

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

HttpSendRequestW
InternetWriteFile
HttpSendRequestA

The Trojan installs the following user-mode hooks in ADVAPI32.dll:

RegCreateKeyExA
RegCreateKeyExW

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

send
getaddrinfo

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

MoveFileA
CopyFileW
CopyFileA
MoveFileW
CreateFileW
CreateFileA

The Trojan 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 Trojan'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.

Removals

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):

   imapi.exe:824
   %original file name%.exe:1708
   %original file name%.exe:1280
   %original file name%.exe:1196
   drwtsn32.exe:1324
   Ctkmko.exe:676
   Ctkmko.exe:564
   Ctkmko.exe:1356
   

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

   %WinDir%\Temp\fwjtntz6.TMP (146970 bytes)
   %Documents and Settings%\%current user%\Application Data\Ctkmko.exe (673 bytes)
   %Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-1844237615-1960408961-1801674531-1003\c5b88721db08c824db69d0bbc702beb8_75ed9567-aa58-4c8e-a8ea-3cad7c47ab03 (44 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\EtfDtg1eKDiK6AhE6Jl.tmp (3 bytes)
   %Documents and Settings%\All Users\Application Data\Microsoft\Dr Watson\user.dmp (183728 bytes)
   %Documents and Settings%\All Users\Application Data\Microsoft\Dr Watson\drwtsn32.log (389686 bytes)
   

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

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

6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
   
7. Reboot the computer.
   

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

Static Analysis

VersionInfo

Company Name: Pink Image
Product Name: Pink Image
Product Version: 1, 0, 0, 1
Legal Copyright: Copyright (c) 2011
Legal Trademarks:
Original Filename: TStub.exe
Internal Name: Pink Image
File Version: 1, 0, 0, 1
File Description: Pink Image
Comments:
Language: English (United States)

Company Name: Pink ImageProduct Name: Pink ImageProduct Version: 1, 0, 0, 1Legal Copyright: Copyright (c) 2011Legal Trademarks: Original Filename: TStub.exeInternal Name: Pink ImageFile Version: 1, 0, 0, 1File Description: Pink ImageComments: Language: English (United States)

PE Sections

Name	Virtual Address	Virtual Size	Raw Size	Entropy	Section MD5
.text	4096	52322	52736	4.58575	b203467501c56f6b093b30818ad3b32b
.rdata	57344	8686	8704	3.192	9a7dc5ff88c2c7b21d2b45926964456f
.data	69632	11784	5120	3.14283	8b505f666143ec9d4a4c648043b2f060
.rsrc	81920	204800	126464	5.4618	7f1f4ba37bc7a66239b9fcd39387716d

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

Network Activity

URLs

IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

Map

The Trojan connects to the servers at the folowing location(s):

Strings from Dumps