ctblocker | 743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87

General

Target

743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87.sample.exe
Size

653KB
MD5

b2e27e88dd895d90f19c8d0314662720
SHA1

cc69874f94ae42a274e4b3171e850ad2d3c02465
SHA256

743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87
SHA512

85c42f2d80fd16b81bad0f110e2c78eb2daa8cdedbbd6d2cc46cad03285b0103d7681d5420ece73ecb95b32c55f9f52934d0ea18bc5da46078a2d26b5d966ca2

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-yhsgjrd.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. YOTOBQN-TWSXU2L-IYKVCNV-QTBRGIS-AHO56FI-URBGHLU-QH7QQU3-3BOFDFN BOCJP5B-SHPNXOG-FUTYQKB-ALCLDT6-E5ATWYU-UO7ALDR-27IRBFR-TLEYK5U 5XHJVQ5-OP4DYYM-PCA23YW-LZMXLKE-ASGG737-BZY3DX6-YF63JQN-AUOEI25 Follow the instructions on the server.

URLs

http://tmc2ybfqzgkaeilm.onion.cab

http://tmc2ybfqzgkaeilm.tor2web.org

http://tmc2ybfqzgkaeilm.onion/

Extracted

Path

C:\Users\Admin\Documents\!Decrypt-All-Files-yhsgjrd.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. YOTOBQN-TWSXU2L-IYKVCNV-QTBRGIS-AHO56FI-URBGHLU-QH7QQU3-3BOFDFN BOCJP5B-SHPNXOG-FUTYQKB-ALCLDT6-E5ATWYU-UO7ALDR-27IRBFR-TLEYK5U 5XHJVQ5-OP4DYYM-PCA23YW-LZMXLKE-ASGGOJ7-LPY3DX6-YF63JQN-AUOUKA6 Follow the instructions on the server.

URLs

http://tmc2ybfqzgkaeilm.onion.cab

http://tmc2ybfqzgkaeilm.tor2web.org

http://tmc2ybfqzgkaeilm.onion/

Extracted

Path

C:\ProgramData\ummcbbc.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 2 IoCs

pid	Process
1624	exusltb.exe
1184	exusltb.exe

Modifies extensions of user files 3 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\SplitInstall.CRW.yhsgjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\FormatHide.RAW.yhsgjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\ConvertFromExport.RAW.yhsgjrd	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-1-5-21-2513283230-931923277-594887482-1000\Control Panel\International\Geo\Nation	exusltb.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 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\counters.dat	exusltb.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-1-5-21-2513283230-931923277-594887482-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Documents\\!Decrypt-All-Files-yhsgjrd.bmp"	Explorer.EXE

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-yhsgjrd.txt	svchost.exe
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-yhsgjrd.bmp	svchost.exe

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
1352	vssadmin.exe

Modifies Internet Explorer settings 1 TTPs 3 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	exusltb.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	exusltb.exe
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Main	exusltb.exe

Modifies data under HKEY_USERS 20 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}\MaxCapacity = "15140"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion	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\Full = "%SystemRoot%\\System32\\imageres.dll,-54"	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
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\WallpaperStyle = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}\NukeOnDelete = "0"	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\LastEnum = 30002c007b00650066006200360030006200650034002d0039006100300034002d0031003100650062002d0062006500300033002d003800300036006500360066003600650036003900360033007d0000000000	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows	svchost.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
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}	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\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon	svchost.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2000	743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87.sample.exe
1624	exusltb.exe
1624	exusltb.exe
1624	exusltb.exe
1624	exusltb.exe
1624	exusltb.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1260	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1624	exusltb.exe
Token: SeDebugPrivilege	1624	exusltb.exe
Token: SeShutdownPrivilege	1260	Explorer.EXE
Token: 33	940	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	940	AUDIODG.EXE
Token: 33	940	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	940	AUDIODG.EXE

Suspicious use of FindShellTrayWindow 5 IoCs

pid	Process
1184	exusltb.exe
1260	Explorer.EXE
1260	Explorer.EXE
1260	Explorer.EXE
1260	Explorer.EXE

Suspicious use of SendNotifyMessage 5 IoCs

pid	Process
1184	exusltb.exe
1260	Explorer.EXE
1260	Explorer.EXE
1260	Explorer.EXE
1260	Explorer.EXE

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1184	exusltb.exe
1184	exusltb.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1216 wrote to memory of 1624	1216	taskeng.exe	30
PID 1216 wrote to memory of 1624	1216	taskeng.exe	30
PID 1216 wrote to memory of 1624	1216	taskeng.exe	30
PID 1216 wrote to memory of 1624	1216	taskeng.exe	30
PID 1624 wrote to memory of 584	1624	exusltb.exe	23
PID 584 wrote to memory of 636	584	svchost.exe	31
PID 584 wrote to memory of 636	584	svchost.exe	31
PID 584 wrote to memory of 636	584	svchost.exe	31
PID 1624 wrote to memory of 1260	1624	exusltb.exe	15
PID 1624 wrote to memory of 1352	1624	exusltb.exe	32
PID 1624 wrote to memory of 1352	1624	exusltb.exe	32
PID 1624 wrote to memory of 1352	1624	exusltb.exe	32
PID 1624 wrote to memory of 1352	1624	exusltb.exe	32
PID 1624 wrote to memory of 1184	1624	exusltb.exe	34
PID 1624 wrote to memory of 1184	1624	exusltb.exe	34
PID 1624 wrote to memory of 1184	1624	exusltb.exe	34
PID 1624 wrote to memory of 1184	1624	exusltb.exe	34
PID 584 wrote to memory of 1072	584	svchost.exe	35
PID 584 wrote to memory of 1072	584	svchost.exe	35
PID 584 wrote to memory of 1072	584	svchost.exe	35

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Sets desktop wallpaper using registry
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:1260
- C:\Users\Admin\AppData\Local\Temp\743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87.sample.exe
  "C:\Users\Admin\AppData\Local\Temp\743302a59617675c4f87a187156f94de2d9cae38026f30bab1b8607a25a70b87.sample.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:2000

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k DcomLaunch
1⤵
- Modifies extensions of user files
- Drops desktop.ini file(s)
- Drops file in Program Files directory
- Modifies data under HKEY_USERS
- Suspicious use of WriteProcessMemory
PID:584
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
  2⤵
  PID:636
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
  2⤵
  PID:1072

C:\Windows\system32\taskeng.exe
taskeng.exe {147575DC-6DA4-4A2A-86BF-9514B0CC2F4B} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1216
- C:\Users\Admin\AppData\Local\Temp\exusltb.exe
  C:\Users\Admin\AppData\Local\Temp\exusltb.exe
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1624
- - C:\Windows\SysWOW64\vssadmin.exe
    vssadmin delete shadows all
    3⤵
    - Interacts with shadow copies
    PID:1352
- - C:\Users\Admin\AppData\Local\Temp\exusltb.exe
    "C:\Users\Admin\AppData\Local\Temp\exusltb.exe" -u
    3⤵
    - 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:1184

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x59c
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:940

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File Deletion

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Inhibit System Recovery

2

T1490

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Downloads

memory/584-73-0x000007FEFB571000-0x000007FEFB573000-memory.dmp

Filesize
8KB

Download
memory/584-69-0x0000000000440000-0x00000000004B7000-memory.dmp

Filesize
476KB

Download
memory/1184-82-0x0000000000770000-0x00000000009BB000-memory.dmp

Filesize
2.3MB

Download
memory/1184-84-0x0000000000150000-0x0000000000151000-memory.dmp

Filesize
4KB

Download
memory/1624-68-0x0000000000910000-0x0000000000B5B000-memory.dmp

Filesize
2.3MB

Download
memory/2000-60-0x0000000000830000-0x0000000000A4A000-memory.dmp

Filesize
2.1MB

Download
memory/2000-62-0x0000000000A50000-0x0000000000C9B000-memory.dmp

Filesize
2.3MB

Download
memory/2000-61-0x0000000075161000-0x0000000075163000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads