ctblocker | 75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e

General

Target

75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e.exe
Size

815KB
MD5

678d3c068832953f7adc0abdc538e320
SHA1

f3283eada70ba0362e9617706272f83f0524b7a1
SHA256

75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e
SHA512

9658c0ab87f96210d6cce95a1f7fcf6cfa3fff4264603bd80a0db567e42506e7a20ec7f39d21b734b4eba9b4b396bd9a140de495e73e39939f30b5b551770ba6
SSDEEP

12288:XGKVawDC8239wUoGtTvtcAEvNThLDlB1l4TcPPN9vegW37blQ06QOtG6aZQx:2KV6tt/Xa3hhLz1l4TK27rblQHQOt7x

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-bgefhdd.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://pf5dahldauhrjxfd.onion.cab or http://pf5dahldauhrjxfd.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://pf5dahldauhrjxfd.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. MW6QKHZ-3LKZI6H-7WQS5Q2-5YAZ2VC-TLJU3FA-GJVDQJR-HQMK6SL-Y5Q3635 I67TO2G-WGQ2NWH-2TDJCJG-F5QBLCZ-CEZWQKB-MPWLIWX-J5D3AD7-MGZ3Z4V 2TQX3M2-UKDGGHN-GN2EIZL-ZNAVQEI-J367FBK-GCXEZ2B-PGEGMEG-BZWZYH4 Follow the instructions on the server.

URLs

http://pf5dahldauhrjxfd.onion.cab

http://pf5dahldauhrjxfd.tor2web.org

http://pf5dahldauhrjxfd.onion/

Extracted

Path

C:\Users\Admin\Documents\!Decrypt-All-Files-bgefhdd.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://pf5dahldauhrjxfd.onion.cab or http://pf5dahldauhrjxfd.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://pf5dahldauhrjxfd.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. MW6QKHZ-3LKZI6H-7WQS5Q2-5YAZ2VC-TLJU3FA-GJVDQJR-HQMK6SL-Y5Q3635 I67TO2G-WGQ2NWH-2TDJCJG-F5QBLCZ-CEZWQKB-MPWLIWX-J5D3AD7-MGZ3Z4V 2TQX3M2-UKDGGHN-GN2EIZL-ZNAVQEI-J367DXK-4EXEZ2B-PGEGMEG-BZWZCTJ Follow the instructions on the server.

URLs

http://pf5dahldauhrjxfd.onion.cab

http://pf5dahldauhrjxfd.tor2web.org

http://pf5dahldauhrjxfd.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
1112	hlahqcg.exe
1604	hlahqcg.exe

Modifies extensions of user files 4 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\MergeReset.CRW.bgefhdd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\CopyCheckpoint.RAW.bgefhdd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\DenyAssert.CRW.bgefhdd	svchost.exe
File renamed	C:\Windows\Temp\laaaaaaa.tmp => C:\Users\Admin\Pictures\ExpandImport.CRW.bgefhdd	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-1-5-21-999675638-2867687379-27515722-1000\Control Panel\International\Geo\Nation	hlahqcg.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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Documents\\!Decrypt-All-Files-bgefhdd.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-bgefhdd.txt	svchost.exe
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-bgefhdd.bmp	svchost.exe

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
1608	vssadmin.exe

Modifies data under HKEY_USERS 19 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket	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\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}	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\{8031afe4-1a82-11ed-a08f-806e6f6e6963}\MaxCapacity = "15140"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	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\{8031afe4-1a82-11ed-a08f-806e6f6e6963}	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{8031afe4-1a82-11ed-a08f-806e6f6e6963}\NukeOnDelete = "0"	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\LastEnum = 30002c007b00380030003300310061006600650034002d0031006100380032002d0031003100650064002d0061003000380066002d003800300036006500360066003600650036003900360033007d0000000000	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	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion	svchost.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
1388	75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe
1112	hlahqcg.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1112	hlahqcg.exe
Token: SeDebugPrivilege	1112	hlahqcg.exe
Token: SeShutdownPrivilege	1396	Explorer.EXE

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1604	hlahqcg.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1604	hlahqcg.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1604	hlahqcg.exe
1604	hlahqcg.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1324 wrote to memory of 1112	1324	taskeng.exe	27
PID 1324 wrote to memory of 1112	1324	taskeng.exe	27
PID 1324 wrote to memory of 1112	1324	taskeng.exe	27
PID 1324 wrote to memory of 1112	1324	taskeng.exe	27
PID 1112 wrote to memory of 596	1112	hlahqcg.exe	24
PID 596 wrote to memory of 580	596	svchost.exe	28
PID 596 wrote to memory of 580	596	svchost.exe	28
PID 596 wrote to memory of 580	596	svchost.exe	28
PID 1112 wrote to memory of 1396	1112	hlahqcg.exe	14
PID 1112 wrote to memory of 1608	1112	hlahqcg.exe	29
PID 1112 wrote to memory of 1608	1112	hlahqcg.exe	29
PID 1112 wrote to memory of 1608	1112	hlahqcg.exe	29
PID 1112 wrote to memory of 1608	1112	hlahqcg.exe	29
PID 1112 wrote to memory of 1604	1112	hlahqcg.exe	31
PID 1112 wrote to memory of 1604	1112	hlahqcg.exe	31
PID 1112 wrote to memory of 1604	1112	hlahqcg.exe	31
PID 1112 wrote to memory of 1604	1112	hlahqcg.exe	31

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Sets desktop wallpaper using registry
- Suspicious use of AdjustPrivilegeToken
PID:1396
- C:\Users\Admin\AppData\Local\Temp\75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e.exe
  "C:\Users\Admin\AppData\Local\Temp\75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1388

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:596
- C:\Windows\system32\DllHost.exe
  C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
  2⤵
  PID:580

C:\Windows\system32\taskeng.exe
taskeng.exe {04FA8D7F-2642-463E-905D-A34925692CC1} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1324
- C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe
  C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1112
- - C:\Windows\SysWOW64\vssadmin.exe
    vssadmin delete shadows all
    3⤵
    - Interacts with shadow copies
    PID:1608
- - C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe
    "C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe" -u
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    PID:1604

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

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Inhibit System Recovery

2

T1490

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\Package Cache\epmlysm

Filesize
654B

MD5
7e40f407a295b6c6882eba9625ac1aad

SHA1
c2d3588fee39f524d57fab31d48b585cc4f6db68

SHA256
cb9dd01a0f665c76f3fb0fd8a528076fff33b225feefee1cb60e5cae98eddc83

SHA512
235751218b3b11aa45e7cbf822c63a0ed157d7f723a7cebbeb18ef79a514ac9bcddbdc9de5238ce36681fff64f075c57e110dad776501967010f4b412af897ee

Download Submit
C:\ProgramData\Package Cache\epmlysm

Filesize
654B

MD5
7e40f407a295b6c6882eba9625ac1aad

SHA1
c2d3588fee39f524d57fab31d48b585cc4f6db68

SHA256
cb9dd01a0f665c76f3fb0fd8a528076fff33b225feefee1cb60e5cae98eddc83

SHA512
235751218b3b11aa45e7cbf822c63a0ed157d7f723a7cebbeb18ef79a514ac9bcddbdc9de5238ce36681fff64f075c57e110dad776501967010f4b412af897ee

Download Submit
C:\ProgramData\Package Cache\epmlysm

Filesize
654B

MD5
6cefa17faccd9b5cf562ba2fd2a2b305

SHA1
35f53e863c975929c0fccae79771e03e62058b23

SHA256
bd891f5541b937502a8bafa94dba03740c37490aba8697bc34c431bec2f32d00

SHA512
fcfc2638bbaa431787e671aa7052745bd09f6f3066bcbe66a519e1513dc757a95cdba847a63383fb8c1e32ebf18554aad7e8a4325e8804e659929f8b37095df3

Download Submit
C:\ProgramData\Package Cache\epmlysm

Filesize
654B

MD5
6cefa17faccd9b5cf562ba2fd2a2b305

SHA1
35f53e863c975929c0fccae79771e03e62058b23

SHA256
bd891f5541b937502a8bafa94dba03740c37490aba8697bc34c431bec2f32d00

SHA512
fcfc2638bbaa431787e671aa7052745bd09f6f3066bcbe66a519e1513dc757a95cdba847a63383fb8c1e32ebf18554aad7e8a4325e8804e659929f8b37095df3

Download Submit
C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe

Filesize
815KB

MD5
678d3c068832953f7adc0abdc538e320

SHA1
f3283eada70ba0362e9617706272f83f0524b7a1

SHA256
75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e

SHA512
9658c0ab87f96210d6cce95a1f7fcf6cfa3fff4264603bd80a0db567e42506e7a20ec7f39d21b734b4eba9b4b396bd9a140de495e73e39939f30b5b551770ba6

Download Submit
C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe

Filesize
815KB

MD5
678d3c068832953f7adc0abdc538e320

SHA1
f3283eada70ba0362e9617706272f83f0524b7a1

SHA256
75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e

SHA512
9658c0ab87f96210d6cce95a1f7fcf6cfa3fff4264603bd80a0db567e42506e7a20ec7f39d21b734b4eba9b4b396bd9a140de495e73e39939f30b5b551770ba6

Download Submit
C:\Users\Admin\AppData\Local\Temp\hlahqcg.exe

Filesize
815KB

MD5
678d3c068832953f7adc0abdc538e320

SHA1
f3283eada70ba0362e9617706272f83f0524b7a1

SHA256
75b22b4ad62ae7c446d97bef05e57852fac262844963b49b2fea3ab197dacf6e

SHA512
9658c0ab87f96210d6cce95a1f7fcf6cfa3fff4264603bd80a0db567e42506e7a20ec7f39d21b734b4eba9b4b396bd9a140de495e73e39939f30b5b551770ba6

Download Submit
memory/596-66-0x0000000000120000-0x0000000000197000-memory.dmp

Filesize
476KB

Download
memory/596-64-0x0000000000120000-0x0000000000197000-memory.dmp

Filesize
476KB

Download
memory/596-70-0x000007FEFC141000-0x000007FEFC143000-memory.dmp

Filesize
8KB

Download
memory/1112-63-0x0000000001020000-0x000000000126B000-memory.dmp

Filesize
2.3MB

Download
memory/1388-57-0x0000000000400000-0x0000000000532000-memory.dmp

Filesize
1.2MB

Download
memory/1388-56-0x0000000002450000-0x000000000269B000-memory.dmp

Filesize
2.3MB

Download
memory/1388-55-0x0000000002230000-0x000000000244A000-memory.dmp

Filesize
2.1MB

Download
memory/1388-54-0x00000000768A1000-0x00000000768A3000-memory.dmp

Filesize
8KB

Download
memory/1604-81-0x0000000002470000-0x00000000026BB000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads