ctblocker | b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0

Analysis

max time kernel
150s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
26-11-2022 14:11

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General

Target

b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0.exe
Size

939KB
MD5

d9b017b1800c44d367ff21125a528d17
SHA1

c01d613dc8bf2e251b7d3e6180e01895f175697c
SHA256

b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0
SHA512

9a0b22b4ff1f73a64e39c94a47eb8d1eabd13e6909add29d921130b1549b65a806fd8b62e2e30f1fc1e882f6ba44f23b2f664428b82ffc7a6566fc9d322e01a9
SSDEEP

24576:+/5UCvsU0yUU1Rm2k/gqTT8MfECZPcxvSD:EeCvszrU1HCg0TcCZP/D

Score

10^/10

ctblocker ransomware

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-tswflmn.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. JFXKG6Y-MPOHA2W-CGL3N45-A5UHDTS-4LCAMV6-OXCE7DH-7SHGQ3J-IAYGW6N WMBLFAB-NRVRJ73-6LS5BLC-CWJYRPQ-JSN76U5-HTW4IUB-O7VECON-J3IO6RG A7LOSS4-OMXKZ7J-7222MAP-NFLGJBQ-MPXTH6L-LPXHC4J-NWISC4S-KUR5KAQ 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-tswflmn.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. JFXKG6Y-MPOHA2W-CGL3N45-A5UHDTS-4LCAMV6-OXCE7DH-7SHGQ3J-IAYGW6N WMBLFAB-NRVRJ73-6LS5BLC-CWJYRPQ-JSN76U5-HTW4IUB-O7VECON-J3IO6RG A7LOSS4-OMXKZ7J-7222MAP-NFLGJBQ-MPXT7PL-DWXHC4J-NWISC4S-KUR5FAB 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 1 IoCs

Processes:

pcrcyge.exe

pid process

952 pcrcyge.exe
Drops desktop.ini file(s) 1 IoCs

Processes:

svchost.exe

description ioc process

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

pid	process
952	pcrcyge.exe

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

Processes:

Explorer.EXE

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Documents\\!Decrypt-All-Files-tswflmn.bmp"	Explorer.EXE

Drops file in Program Files directory 2 IoCs

Processes:

svchost.exe

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

Processes:

vssadmin.exe

pid process

1480 vssadmin.exe

pid	process
1480	vssadmin.exe

Modifies data under HKEY_USERS 20 IoCs

Processes:

svchost.exe

description	ioc	process
Set value (data)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\LastEnum = 30002c007b00360061003200380062003200320034002d0031006100380032002d0031003100650064002d0062003900380066002d003800300036006500360066003600650036003900360033007d0000000000	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\CLSID	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows	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
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\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{6a28b224-1a82-11ed-b98f-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 (str)	\REGISTRY\USER\.DEFAULT\Control Panel\Desktop\TileWallpaper = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}\DefaultIcon	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
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{6a28b224-1a82-11ed-b98f-806e6f6e6963}	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer	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	svchost.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{6a28b224-1a82-11ed-b98f-806e6f6e6963}\NukeOnDelete = "0"	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	svchost.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

Processes:

b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0.exepcrcyge.exe

pid	process
1996	b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe
952	pcrcyge.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

pcrcyge.exeExplorer.EXE

description pid process

Token: SeDebugPrivilege 952 pcrcyge.exe
Token: SeDebugPrivilege 952 pcrcyge.exe
Token: SeShutdownPrivilege 1212 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	952	pcrcyge.exe
Token: SeDebugPrivilege	952	pcrcyge.exe
Token: SeShutdownPrivilege	1212	Explorer.EXE

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

taskeng.exepcrcyge.exesvchost.exe

description	pid	process	target process
PID 1744 wrote to memory of 952	1744	taskeng.exe	pcrcyge.exe
PID 1744 wrote to memory of 952	1744	taskeng.exe	pcrcyge.exe
PID 1744 wrote to memory of 952	1744	taskeng.exe	pcrcyge.exe
PID 1744 wrote to memory of 952	1744	taskeng.exe	pcrcyge.exe
PID 952 wrote to memory of 596	952	pcrcyge.exe	svchost.exe
PID 952 wrote to memory of 1212	952	pcrcyge.exe	Explorer.EXE
PID 596 wrote to memory of 588	596	svchost.exe	DllHost.exe
PID 596 wrote to memory of 588	596	svchost.exe	DllHost.exe
PID 596 wrote to memory of 588	596	svchost.exe	DllHost.exe
PID 952 wrote to memory of 1480	952	pcrcyge.exe	vssadmin.exe
PID 952 wrote to memory of 1480	952	pcrcyge.exe	vssadmin.exe
PID 952 wrote to memory of 1480	952	pcrcyge.exe	vssadmin.exe
PID 952 wrote to memory of 1480	952	pcrcyge.exe	vssadmin.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Sets desktop wallpaper using registry
- Suspicious use of AdjustPrivilegeToken
PID:1212

C:\Users\Admin\AppData\Local\Temp\b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0.exe
"C:\Users\Admin\AppData\Local\Temp\b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
PID:1996

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k DcomLaunch
1⤵
- 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:588

C:\Windows\system32\taskeng.exe
taskeng.exe {777DBD3A-6D1B-4B94-A098-500748682F07} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1744

C:\Users\Admin\AppData\Local\Temp\pcrcyge.exe
C:\Users\Admin\AppData\Local\Temp\pcrcyge.exe
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:952

C:\Windows\SysWOW64\vssadmin.exe
vssadmin delete shadows all
3⤵
- Interacts with shadow copies
PID:1480

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File Deletion

T1107

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Inhibit System Recovery

T1490

Defacement

T1491

Replay Monitor

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Downloads

C:\ProgramData\Microsoft Help\aubdarb
Filesize
654B

MD5
eae6483054805bf4fea2820d8bea9506

SHA1
f90be4d794d357836cbf540253e725b5c79ea742

SHA256
a9ff39b3a48b20ebb9c088eb7b2df60bcca87adec617f3c94b6cf4ddf7dda2f2

SHA512
f769027b63b8bf9f438a0c32ec2c35e6cb548dd9eb65b022d2a253a6d6d56454e503ce4e8008a0e7b52859b28272e38c7294e15eee05c38abae6a554bebba6bf

Download Submit
C:\ProgramData\Microsoft Help\aubdarb
Filesize
654B

MD5
eae6483054805bf4fea2820d8bea9506

SHA1
f90be4d794d357836cbf540253e725b5c79ea742

SHA256
a9ff39b3a48b20ebb9c088eb7b2df60bcca87adec617f3c94b6cf4ddf7dda2f2

SHA512
f769027b63b8bf9f438a0c32ec2c35e6cb548dd9eb65b022d2a253a6d6d56454e503ce4e8008a0e7b52859b28272e38c7294e15eee05c38abae6a554bebba6bf

Download Submit
C:\ProgramData\Microsoft Help\aubdarb
Filesize
654B

MD5
3cb1e26ee9ce95e7e330daa5fe81c3ea

SHA1
f869a5dc9031609713cc3b12847d042a013d9287

SHA256
dfa09f07828538a8deb9fefee0b0a03bd6f5980d1c20bbf9feb6cf445862cd99

SHA512
3000ee71a4887ba58a8b3d6331c871a036e9a7dfa537b799fedd6ebc4ea4f621b929a8b92ee16228fc2998d32e54d305fba2e6f57044d73077d58b2f161a5296

Download Submit
C:\ProgramData\Microsoft Help\aubdarb
Filesize
654B

MD5
d2bc1bf996cb95a15e242ca07aad4ec8

SHA1
fc3e971435c7205a7a470d0256b616e5babe1c12

SHA256
418e6c48e52878159457c69241a727deea8dedd6b16c45f7a49a823f002292ba

SHA512
0f9b46c57b9709e5db0a3528b3715f1133abdea30f5356788fd300113e010a0212825fa8c3cc8f33f29c13520418983869d3effe03c85aaa2daa72a66aeb634c

Download Submit
C:\Users\Admin\AppData\Local\Temp\pcrcyge.exe
Filesize
939KB

MD5
d9b017b1800c44d367ff21125a528d17

SHA1
c01d613dc8bf2e251b7d3e6180e01895f175697c

SHA256
b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0

SHA512
9a0b22b4ff1f73a64e39c94a47eb8d1eabd13e6909add29d921130b1549b65a806fd8b62e2e30f1fc1e882f6ba44f23b2f664428b82ffc7a6566fc9d322e01a9

Download Submit
C:\Users\Admin\AppData\Local\Temp\pcrcyge.exe
Filesize
939KB

MD5
d9b017b1800c44d367ff21125a528d17

SHA1
c01d613dc8bf2e251b7d3e6180e01895f175697c

SHA256
b8ee83f09c15c7a11f5c0a7fa686cf0cfa7f561e8d7d9dfb303cbfc2bce246e0

SHA512
9a0b22b4ff1f73a64e39c94a47eb8d1eabd13e6909add29d921130b1549b65a806fd8b62e2e30f1fc1e882f6ba44f23b2f664428b82ffc7a6566fc9d322e01a9

Download Submit
C:\Users\Admin\Desktop\BlockDebug.XLSB.tswflmn
Filesize
256KB

MD5
db54639c62155872ecd1733b98a00095

SHA1
d99b3f794cae086e37040bbd5490d09c36da8938

SHA256
7191df8ed1b931002edabd25e88443e5ea4c0bdc437d858bf80cb8e6cbc6abed

SHA512
24e2265060ef69b6f2a17c2cd898e01b75dccc5e28be78d81acab17ae39fe44f8a30a55dde39547f82a0b22277835ac4cbdfe17951149d4887b8049c699c88ba

Download Submit
C:\Users\Admin\Desktop\ConvertInvoke.7Z.tswflmn
Filesize
304KB

MD5
e0104b8decab5e7d8e52b3b7a886f209

SHA1
ebffd984d9073d958ce6686ee8836a8114c6bbfb

SHA256
2a32384dc5130a35b4b6c587907d66400dd637ecb1488770233c5764a2ddf062

SHA512
b2b60069642d811e425908b05e20b5471bab61669563eaa3f050df744a7c064e622c9af6e466f0b1379c40b7939d6abdec9e06f35ac1315b6492ec61fb152d55

Download Submit
C:\Users\Admin\Desktop\GroupJoin.VSD.tswflmn
Filesize
368KB

MD5
8c08a5cda2f70a482a3b7eb3fc6b6c0e

SHA1
7ca97e8c4401cac7a638cfb4ba01c8db1d2a778e

SHA256
50a49ecd3b1f3f613271d710807b40349eaf2f671a99f801be4b4470d3809d5d

SHA512
8227a8303c869a1632303088ae040103847f3d183f9a80b134136fe94801ca8eba4cb1ce1d913b6ba7c99ff9f8c22b10f010bb2928f499a0c2d05c90e2bcee31

Download Submit
C:\Users\Admin\Desktop\InstallEdit.WPS.tswflmn
Filesize
192KB

MD5
1a23730211fb9de010580d6aaed60493

SHA1
7ee151c52fadc589a3fb8aff2eac18a2153acb60

SHA256
095db81bb26f778afe58a81fefa0b7a6ea4c7de403c7c16fc80ae893dafbe22a

SHA512
80fe74359b6133707cca38df985aa31eea9cfbb06dcf6f793a4cbc89476d5e14508061d7167ad7d12b821814a7e2295de9c0945c2174a400bbeb567f5adb49ac

Download Submit
C:\Users\Admin\Desktop\MountPop.ZIP.tswflmn
Filesize
336KB

MD5
ee4cd1fbf9f553b3322d57c1dedd0bd1

SHA1
0d6e2cea212cb4227cd1aa2c235ce4ffbd36fd90

SHA256
e2e101d60006a7f611e28bcdae8e79fdfb2fbf3a79649d2dac7cd4793a7075cd

SHA512
83d03fd52e1cea1fa836a485563fb104fa11d0444f3981571f0818955c1df472ae8fa11df7152e9924f8b19648790070a7327dc159cd4104ded39ecfcf0c4894

Download Submit
C:\Users\Admin\Desktop\OutConfirm.TXT.tswflmn
Filesize
272KB

MD5
50b77944c2b5e80f3050268790d6c175

SHA1
14b4fcada2835a48ec6849bc0b807e3cc7805a22

SHA256
1a44ae375b30373860573780bd5eb0e2a77b1ff2e02a24496fe2e160412cd736

SHA512
62e4fd4038cfa785a30b29ee9ffd6e133e7d910af0a29a2fed725b84c71c96b6a82f293d803746db338a549d44c4e4c0ce6894ddb09761fa93821b292cfa5aa0

Download Submit
C:\Users\Admin\Desktop\ReadPublish.WPS.tswflmn
Filesize
544KB

MD5
332f6890c270b27b3561588bbc67e7da

SHA1
ea395794d655443d3c535f1880f0e9f8ecb065dc

SHA256
be848e5779f8fbc7331b2f1a4a50a8f8b5e4e9d18e4c372698e4f187d858b728

SHA512
dedc2f7fe16be56da8d2161a313e20ebbfe5752c18036bfa55b8b52eae2641e3c1a8849da37c3a04d7798b0a5d425b5abcb3b089bedeb6fc2b24ed9eab3fa609

Download Submit
memory/588-84-0x0000000000000000-mapping.dmp

Download
memory/596-68-0x00000000003F0000-0x0000000000467000-memory.dmp

Filesize
476KB

Download
memory/596-71-0x000007FEFB6A1000-0x000007FEFB6A3000-memory.dmp

Filesize
8KB

Download
memory/596-66-0x00000000003F0000-0x0000000000467000-memory.dmp

Filesize
476KB

Download
memory/952-65-0x0000000000400000-0x0000000002007000-memory.dmp

Filesize
28.0MB

Download
memory/952-64-0x0000000002AC0000-0x0000000002D0B000-memory.dmp

Filesize
2.3MB

Download
memory/952-60-0x0000000000000000-mapping.dmp

Download
memory/1480-85-0x0000000000000000-mapping.dmp

Download
memory/1996-56-0x0000000004C70000-0x0000000004E8A000-memory.dmp

Filesize
2.1MB

Download
memory/1996-55-0x00000000003D0000-0x00000000003D3000-memory.dmp

Filesize
12KB

Download
memory/1996-57-0x0000000004E90000-0x00000000050DB000-memory.dmp

Filesize
2.3MB

Download
memory/1996-58-0x0000000000400000-0x0000000002007000-memory.dmp

Filesize
28.0MB

Download
memory/1996-54-0x0000000075601000-0x0000000075603000-memory.dmp

Filesize
8KB

Download