ctblocker | bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21

Analysis

max time kernel
151s
max time network
117s
platform
windows10_x64
resource
win10v20210410
submitted
26-07-2021 12:39

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General

Target

bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
Size

788KB
MD5

40ce00566109565d499b53a150716303
SHA1

c2decc8da4ea7f18236f7581130515bb378c21da
SHA256

bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21
SHA512

8d9c13aa0b5f44cff62e7e676df7b524420330008f69697c2e9b287084fa243e0ef47b9696814e4dafdc27e113aa792a82b0bb4e376bad7b90cb967396ed8b1c

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Users\Admin\Documents\!Decrypt-All-Files-tfpixtg.txt

Ransom Note

Your documents, photos, databases and other important files have been encrypted with strongest encryption and unique key, generated for this computer. Private decryption key is stored on a secret Internet server and nobody can decrypt your files until you pay and obtain the private key. If you see the main locker window, follow the instructions on the locker. Overwise, it's seems that you or your antivirus deleted the locker program. Now you have the last chance to decrypt your files. Open http://tmc2ybfqzgkaeilm.onion.cab or http://tmc2ybfqzgkaeilm.tor2web.org in your browser. They are public gates to the secret server. If you have problems with gates, use direct connection: 1. Download Tor Browser from http://torproject.org 2. In the Tor Browser open the http://tmc2ybfqzgkaeilm.onion/ Note that this server is available via Tor Browser only. Retry in 1 hour if site is not reachable. Copy and paste the following public key in the input form on server. Avoid missprints. ZSLHVVV-BPVO7NC-JAQ2QDZ-F3UNXAX-CLIHAE4-XR4LCR7-ETUGKIF-PE6KUJM XWKIYUO-YCYUXYJ-56I5CC3-F5MJD6Z-DNBXD62-ML2S6IM-TRNVJL2-EK2XRUU J2KPZKJ-BKAOGQ3-JFAUN5V-VVX776C-LDABEGQ-A4LON7N-VUC5ULS-VNLP3LN Follow the instructions on the server.

URLs

http://tmc2ybfqzgkaeilm.onion.cab

http://tmc2ybfqzgkaeilm.tor2web.org

http://tmc2ybfqzgkaeilm.onion/

Extracted

Path

C:\ProgramData\kwivvrl.html

Ransom Note

Your documents, photos, databases and other important files have been encrypted with strongest encryption and unique key, generated for this computer. Private decryption key is stored on a secret Internet server and nobody can decrypt your files until you pay and obtain the private key. If you see the main locker window, follow the instructions on the locker. Overwise, it's seems that you or your antivirus deleted the locker program. Now you have the last chance to decrypt your files. Open http://tmc2ybfqzgkaeilm.onion.cab or http://tmc2ybfqzgkaeilm.tor2web.org in your browser. They are public gates to the secret server. If you have problems with gates, use direct connection: 1. Download Tor Browser from http://torproject.org. 2. In the Tor Browser open the http://tmc2ybfqzgkaeilm.onion Note that this server is available via Tor Browser only. Retry in 1 hour if site is not reachable. Copy and paste the following public key in the input form on server. Avoid missprints. Follow the instructions on the server. The list of your encrypted files: Path File

URLs

http://tmc2ybfqzgkaeilm.onion.cab

http://tmc2ybfqzgkaeilm.tor2web.org

http://tmc2ybfqzgkaeilm.onion

Signatures

CTB-Locker
Ransomware family which uses Tor to hide its C2 communications.
ransomware ctblocker
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Executes dropped EXE 4 IoCs

pid	Process
2728	pwqidta.exe
3748	pwqidta.exe
2728	pwqidta.exe
2256	pwqidta.exe

Modifies extensions of user files 1 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\InitializeExit.CRW.tfpixtg	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Control Panel\International\Geo\Nation	pwqidta.exe

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	C:\$RECYCLE.BIN\S-1-5-18\desktop.ini	svchost.exe

Drops file in System32 directory 8 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\x\system.pif	pwqidta.exe
File created	C:\Windows\SysWOW64\x\system.pif	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\History\History.IE5	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\counters2.dat	pwqidta.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\History\desktop.ini	pwqidta.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Documents\\!Decrypt-All-Files-tfpixtg.bmp"	Explorer.EXE

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3736 set thread context of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 2728 set thread context of 3748	2728	pwqidta.exe	78
PID 2728 set thread context of 2256	2728	pwqidta.exe	87

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Interacts with shadow copies 2 TTPs 1 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
2756	vssadmin.exe

Modifies Internet Explorer settings 1 TTPs 4 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	pwqidta.exe
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Internet Explorer\GPU	pwqidta.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Internet Explorer\GPU\AdapterInfo = "vendorId=\"0x1414\",deviceID=\"0x8c\",subSysID=\"0x0\",revision=\"0x0\",version=\"6.2.15063.0\"hypervisor=\"No Hypervisor (No SLAT)\""	pwqidta.exe
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	pwqidta.exe

Modifies data under HKEY_USERS 25 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Local AppWizard-Generated Applications\pwqidta\Recent File List	pwqidta.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{266d1ca4-0000-0000-0000-500600000000}	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\LastEnum = 30002c007b00320036003600640031006300610034002d0030003000300030002d0030003000300030002d0030003000300030002d003500300030003600300030003000300030003000300030007d0000000000	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon\ = "%SystemRoot%\\System32\\imageres.dll,-55"	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon\Empty = "%SystemRoot%\\System32\\imageres.dll,-55"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Local AppWizard-Generated Applications\pwqidta	pwqidta.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\16\52C64B7E\LanguageList = 65006e002d0055005300000065006e0000000000	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\16\52C64B7E\@%SystemRoot%\system32\shell32.dll,-50176 = "File Operation"	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{266d1ca4-0000-0000-0000-500600000000}\MaxCapacity = "15150"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Local AppWizard-Generated Applications	pwqidta.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{266d1ca4-0000-0000-0000-500600000000}\NukeOnDelete = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Local AppWizard-Generated Applications\pwqidta\Settings	pwqidta.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon\Full = "%SystemRoot%\\System32\\imageres.dll,-54"	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\WallpaperStyle = "0"	svchost.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
1468	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
1468	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
2728	pwqidta.exe
2728	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
3748	pwqidta.exe
2728	pwqidta.exe
2728	pwqidta.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3052	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 20 IoCs

description	pid	Process
Token: SeDebugPrivilege	3748	pwqidta.exe
Token: SeDebugPrivilege	3748	pwqidta.exe
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE
Token: SeShutdownPrivilege	3052	Explorer.EXE
Token: SeCreatePagefilePrivilege	3052	Explorer.EXE

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2256	pwqidta.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2256	pwqidta.exe

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
2728	pwqidta.exe
2728	pwqidta.exe
2256	pwqidta.exe
2256	pwqidta.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 3736 wrote to memory of 1468	3736	bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe	74
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 2728 wrote to memory of 3748	2728	pwqidta.exe	78
PID 3748 wrote to memory of 716	3748	pwqidta.exe	62
PID 3748 wrote to memory of 3052	3748	pwqidta.exe	14
PID 3748 wrote to memory of 2756	3748	pwqidta.exe	84
PID 3748 wrote to memory of 2756	3748	pwqidta.exe	84
PID 3748 wrote to memory of 2756	3748	pwqidta.exe	84
PID 3748 wrote to memory of 2728	3748	pwqidta.exe	86
PID 3748 wrote to memory of 2728	3748	pwqidta.exe	86
PID 3748 wrote to memory of 2728	3748	pwqidta.exe	86
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87
PID 2728 wrote to memory of 2256	2728	pwqidta.exe	87

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Sets desktop wallpaper using registry
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:3052
- C:\Users\Admin\AppData\Local\Temp\bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
  "C:\Users\Admin\AppData\Local\Temp\bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3736
- - C:\Users\Admin\AppData\Local\Temp\bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\bb639437f50637545c4b0e963295b72a9bfd43bb7a9545d5e496123172845d21.sample.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:1468

c:\windows\system32\svchost.exe
c:\windows\system32\svchost.exe -k dcomlaunch -s PlugPlay
1⤵
- Modifies extensions of user files
- Drops desktop.ini file(s)
- Modifies data under HKEY_USERS
PID:716

C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
1⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of SetThreadContext
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2728
- C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
  C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3748
- - C:\Windows\SysWOW64\vssadmin.exe
    vssadmin delete shadows all
    3⤵
    - Interacts with shadow copies
    PID:2756
- - C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
    "C:\Users\Admin\AppData\Local\Temp\pwqidta.exe" -u
    3⤵
    - Executes dropped EXE
    - Drops file in System32 directory
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2728
  - - C:\Users\Admin\AppData\Local\Temp\pwqidta.exe
      "C:\Users\Admin\AppData\Local\Temp\pwqidta.exe" -u
      4⤵
      Executes dropped EXE
      Checks computer location settings
      Drops file in System32 directory
      Modifies Internet Explorer settings
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      Suspicious use of SetWindowsHookEx
      PID:2256

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File Deletion

T1107

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

memory/716-127-0x0000000006AE0000-0x0000000006B57000-memory.dmp

Filesize
476KB

Download
memory/1468-114-0x0000000000400000-0x0000000004429000-memory.dmp

Filesize
64.2MB

Download
memory/1468-121-0x0000000000400000-0x00000000004A4400-memory.dmp

Filesize
657KB

Download
memory/1468-118-0x00000000048C0000-0x0000000004B0B000-memory.dmp

Filesize
2.3MB

Download
memory/1468-117-0x00000000046A0000-0x00000000048BA000-memory.dmp

Filesize
2.1MB

Download
memory/2256-142-0x0000000004950000-0x0000000004B9B000-memory.dmp

Filesize
2.3MB

Download
memory/2728-138-0x0000000000620000-0x0000000000625000-memory.dmp

Filesize
20KB

Download
memory/3736-115-0x00000000004D0000-0x000000000061A000-memory.dmp

Filesize
1.3MB

Download
memory/3748-126-0x0000000004880000-0x0000000004ACB000-memory.dmp

Filesize
2.3MB

Download