ctblocker | 5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a

General

Target

5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a.sample.exe
Size

674KB
MD5

1c0fbff0f6a18ce6d05e0026b7423b64
SHA1

f422c94cc824c175802df15408114b6284918e17
SHA256

5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a
SHA512

40574e3441267cefb672a10745a450e6147846af3bc6df1c7eb7eef4510f9f8876821c93ae0d2792fbc2c9d1e6ab37cc89bbe3b8c35d77fc28ab0c1aefbccf41

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-oslhjrd.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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. HMFHACG-MTNJTH5-NO6MUR2-XR7XFUW-UGJJFDQ-JG3BBP7-7MBVB6V-WYWPP6N 6YWRN5U-43HO6OG-O4RJVJY-U5HHQGO-WMRWXLW-3CTVWLQ-EFEDTYD-CLXYFKI BCW56WT-QDMVU2M-TIHDHA7-GWJEYB2-SW7XTPV-LG2XYEQ-6E3MGFB-Z3AONYZ Follow the instructions on the server.

URLs

http://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.onion/

Extracted

Path

C:\Users\Admin\Documents\!Decrypt-All-Files-oslhjrd.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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. HMFHACG-MTNJTH5-NO6MUR2-XR7XFUW-UGJJFDQ-JG3BBP7-7MBVB6V-WYWPP6N 6YWRN5U-43HO6OG-O4RJVJY-U5HHQGO-WMRWXLW-3CTVWLQ-EFEDTYD-CLXYFKI BCW56WT-QDMVU2M-TIHDHA7-GWJEYB2-SW7XT5V-3R2XYEQ-6E3MGFB-Z3AOGXV Follow the instructions on the server.

URLs

http://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.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
1484	exusltb.exe
920	exusltb.exe

Modifies extensions of user files 5 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\SaveOptimize.CRW.oslhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\ConvertResolve.CRW.oslhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\ExportUnpublish.RAW.oslhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\WatchRename.RAW.oslhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\CloseWatch.CRW.oslhjrd	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-oslhjrd.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-oslhjrd.bmp	svchost.exe
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-oslhjrd.txt	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
1648	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	exusltb.exe
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

Modifies data under HKEY_USERS 19 IoCs

description	ioc	Process
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
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}\MaxCapacity = "15140"	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}\DefaultIcon	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\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\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion	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 (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{efb60be4-9a04-11eb-be03-806e6f6e6963}\NukeOnDelete = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\WallpaperStyle = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	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

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1816	5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a.sample.exe
1484	exusltb.exe
1484	exusltb.exe
1484	exusltb.exe
1484	exusltb.exe
1484	exusltb.exe
1484	exusltb.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1220	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1484	exusltb.exe
Token: SeDebugPrivilege	1484	exusltb.exe
Token: SeShutdownPrivilege	1220	Explorer.EXE
Token: 33	1052	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1052	AUDIODG.EXE
Token: 33	1052	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1052	AUDIODG.EXE

Suspicious use of FindShellTrayWindow 5 IoCs

pid	Process
920	exusltb.exe
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE

Suspicious use of SendNotifyMessage 5 IoCs

pid	Process
920	exusltb.exe
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
920	exusltb.exe
920	exusltb.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1984 wrote to memory of 1484	1984	taskeng.exe	30
PID 1984 wrote to memory of 1484	1984	taskeng.exe	30
PID 1984 wrote to memory of 1484	1984	taskeng.exe	30
PID 1984 wrote to memory of 1484	1984	taskeng.exe	30
PID 1484 wrote to memory of 580	1484	exusltb.exe	23
PID 580 wrote to memory of 336	580	svchost.exe	31
PID 580 wrote to memory of 336	580	svchost.exe	31
PID 580 wrote to memory of 336	580	svchost.exe	31
PID 1484 wrote to memory of 1220	1484	exusltb.exe	11
PID 1484 wrote to memory of 1648	1484	exusltb.exe	32
PID 1484 wrote to memory of 1648	1484	exusltb.exe	32
PID 1484 wrote to memory of 1648	1484	exusltb.exe	32
PID 1484 wrote to memory of 1648	1484	exusltb.exe	32
PID 1484 wrote to memory of 920	1484	exusltb.exe	34
PID 1484 wrote to memory of 920	1484	exusltb.exe	34
PID 1484 wrote to memory of 920	1484	exusltb.exe	34
PID 1484 wrote to memory of 920	1484	exusltb.exe	34
PID 580 wrote to memory of 1792	580	svchost.exe	35
PID 580 wrote to memory of 1792	580	svchost.exe	35
PID 580 wrote to memory of 1792	580	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:1220
- C:\Users\Admin\AppData\Local\Temp\5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a.sample.exe
  "C:\Users\Admin\AppData\Local\Temp\5213f2db9add9fed538d3730ccafde120cf3822d7a4c17ec17eba6347e417f8a.sample.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1816

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:580
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
  2⤵
  PID:336
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
  2⤵
  PID:1792

C:\Windows\system32\taskeng.exe
taskeng.exe {15241813-FF69-4180-9566-9FA9FAD25B98} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1984
- 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:1484
- - C:\Windows\SysWOW64\vssadmin.exe
    vssadmin delete shadows all
    3⤵
    - Interacts with shadow copies
    PID:1648
- - 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:920

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x594
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1052

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/580-69-0x0000000000E00000-0x0000000000E77000-memory.dmp

Filesize
476KB

Download
memory/580-73-0x000007FEFB881000-0x000007FEFB883000-memory.dmp

Filesize
8KB

Download
memory/920-82-0x0000000000640000-0x000000000088B000-memory.dmp

Filesize
2.3MB

Download
memory/920-83-0x0000000000190000-0x0000000000191000-memory.dmp

Filesize
4KB

Download
memory/1484-68-0x00000000006F0000-0x000000000093B000-memory.dmp

Filesize
2.3MB

Download
memory/1816-60-0x00000000008C0000-0x0000000000ADA000-memory.dmp

Filesize
2.1MB

Download
memory/1816-62-0x0000000000AE0000-0x0000000000D2B000-memory.dmp

Filesize
2.3MB

Download
memory/1816-61-0x0000000075631000-0x0000000075633000-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