ctblocker | 1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f

Analysis

max time kernel
150s
max time network
51s
platform
windows7_x64
resource
win7v20210410
submitted
26-07-2021 12:57

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General

Target

1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe
Size

731KB
MD5

3d9a9103b13744b626e67f5dab6618e7
SHA1

9ad16fb6810dd136985c8a78688b81e275ddf979
SHA256

1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f
SHA512

b76543636c4b25393e3a896fe9bf48d26dc6d6da72e417a00a63692e54e03d766c2e4e43f9c591b0cd62b7022e76be57ddbf14924e837e41932baa22b5eb9c34

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-aijhjrd.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. 6UQYQQV-5AXU6LP-HNJSOYN-LHAZLEI-Y35L725-UA6DH6P-7627YWS-ABULIOH EVQC7WZ-5GZIAOH-MB4WJRT-Q3FNXDE-FC6IEQX-OXZKVCJ-NZIKHMC-MJMBU4D OVNUF2A-7XC6CGT-M7BPSSN-2X2STIX-AWEDCO6-ODCMFW3-YMCXJTC-I2NNJWW 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-aijhjrd.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. 6UQYQQV-5AXU6LP-HNJSOYN-LHAZLEI-Y35L725-UA6DH6P-7627YWS-ABULIOH EVQC7WZ-5GZIAOH-MB4WJRT-Q3FNXDE-FC6IEQX-OXZKVCJ-NZIKHMC-MJMBU4D OVNUF2A-7XC6CGT-M7BPSSN-2X2STIX-AWEDT46-EVCMFW3-YMCXJTC-I2N5LMV 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 4 IoCs

pid	Process
1724	exusltb.exe
1224	exusltb.exe
1108	exusltb.exe
1620	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\FormatHide.RAW.aijhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\ConvertFromExport.RAW.aijhjrd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\SplitInstall.CRW.aijhjrd	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-aijhjrd.bmp"	Explorer.EXE

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1860 set thread context of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1724 set thread context of 1224	1724	exusltb.exe	32
PID 1108 set thread context of 1620	1108	exusltb.exe	37

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-aijhjrd.txt	svchost.exe
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-aijhjrd.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
1768	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
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\ = "%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 (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\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\LastEnum = 30002c007b00650066006200360030006200650034002d0039006100300034002d0031003100650062002d0062006500300033002d003800300036006500360066003600650036003900360033007d0000000000	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	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\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}	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}\NukeOnDelete = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket	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	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	svchost.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
608	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe
1224	exusltb.exe
1224	exusltb.exe
1224	exusltb.exe
1224	exusltb.exe
1224	exusltb.exe
1224	exusltb.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1224	exusltb.exe
Token: SeDebugPrivilege	1224	exusltb.exe
Token: SeShutdownPrivilege	1380	Explorer.EXE
Token: SeShutdownPrivilege	1380	Explorer.EXE
Token: 33	1400	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1400	AUDIODG.EXE
Token: 33	1400	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1400	AUDIODG.EXE

Suspicious use of FindShellTrayWindow 7 IoCs

pid	Process
1620	exusltb.exe
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE

Suspicious use of SendNotifyMessage 5 IoCs

pid	Process
1620	exusltb.exe
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE
1380	Explorer.EXE

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe
1724	exusltb.exe
1108	exusltb.exe
1620	exusltb.exe
1620	exusltb.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1860 wrote to memory of 608	1860	1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe	29
PID 1652 wrote to memory of 1724	1652	taskeng.exe	31
PID 1652 wrote to memory of 1724	1652	taskeng.exe	31
PID 1652 wrote to memory of 1724	1652	taskeng.exe	31
PID 1652 wrote to memory of 1724	1652	taskeng.exe	31
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1724 wrote to memory of 1224	1724	exusltb.exe	32
PID 1224 wrote to memory of 580	1224	exusltb.exe	23
PID 580 wrote to memory of 1060	580	svchost.exe	33
PID 580 wrote to memory of 1060	580	svchost.exe	33
PID 580 wrote to memory of 1060	580	svchost.exe	33
PID 1224 wrote to memory of 1380	1224	exusltb.exe	11
PID 1224 wrote to memory of 1768	1224	exusltb.exe	34
PID 1224 wrote to memory of 1768	1224	exusltb.exe	34
PID 1224 wrote to memory of 1768	1224	exusltb.exe	34
PID 1224 wrote to memory of 1768	1224	exusltb.exe	34
PID 1224 wrote to memory of 1108	1224	exusltb.exe	36
PID 1224 wrote to memory of 1108	1224	exusltb.exe	36
PID 1224 wrote to memory of 1108	1224	exusltb.exe	36
PID 1224 wrote to memory of 1108	1224	exusltb.exe	36
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 1108 wrote to memory of 1620	1108	exusltb.exe	37
PID 580 wrote to memory of 1604	580	svchost.exe	38
PID 580 wrote to memory of 1604	580	svchost.exe	38
PID 580 wrote to memory of 1604	580	svchost.exe	38

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Sets desktop wallpaper using registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:1380
- C:\Users\Admin\AppData\Local\Temp\1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe
  "C:\Users\Admin\AppData\Local\Temp\1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1860
- - C:\Users\Admin\AppData\Local\Temp\1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\1acaa7aed372080632dd0958c63c0a9ad56f8b4dbdc3c265801321018766b29f.sample.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:608

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:1060
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
  2⤵
  PID:1604

C:\Windows\system32\taskeng.exe
taskeng.exe {1BE0CBE4-911B-48D1-B680-F34040E03C34} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1652
- C:\Users\Admin\AppData\Local\Temp\exusltb.exe
  C:\Users\Admin\AppData\Local\Temp\exusltb.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1724
- - C:\Users\Admin\AppData\Local\Temp\exusltb.exe
    "C:\Users\Admin\AppData\Local\Temp\exusltb.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1224
  - - C:\Windows\SysWOW64\vssadmin.exe
      vssadmin delete shadows all
      4⤵
      Interacts with shadow copies
      PID:1768
  - - C:\Users\Admin\AppData\Local\Temp\exusltb.exe
      "C:\Users\Admin\AppData\Local\Temp\exusltb.exe" -u
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1108
    - - C:\Users\Admin\AppData\Local\Temp\exusltb.exe
        
        "C:\Users\Admin\AppData\Local\Temp\exusltb.exe"
        5⤵
        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:1620

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x26c
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1400

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/580-79-0x00000000004A0000-0x0000000000517000-memory.dmp

Filesize
476KB

Download
memory/580-83-0x000007FEFBDA1000-0x000007FEFBDA3000-memory.dmp

Filesize
8KB

Download
memory/608-62-0x0000000000400000-0x00000000004A5000-memory.dmp

Filesize
660KB

Download
memory/608-67-0x0000000000400000-0x00000000004A4400-memory.dmp

Filesize
657KB

Download
memory/608-66-0x00000000006D0000-0x000000000091B000-memory.dmp

Filesize
2.3MB

Download
memory/608-65-0x00000000757D1000-0x00000000757D3000-memory.dmp

Filesize
8KB

Download
memory/608-64-0x00000000004B0000-0x00000000006CA000-memory.dmp

Filesize
2.1MB

Download
memory/1224-78-0x0000000000C10000-0x0000000000E5B000-memory.dmp

Filesize
2.3MB

Download
memory/1620-97-0x0000000000940000-0x0000000000B8B000-memory.dmp

Filesize
2.3MB

Download
memory/1620-99-0x0000000000250000-0x0000000000251000-memory.dmp

Filesize
4KB

Download