rook | 4ed812a7bbb4b1d5fa0044bb17f8cf5ddfd526fd5216b7658f88ebaad2751e19

General

Target
rook.exe
Size 5.4MB
Sample230419-x5ympaeh2w
SHA256 96f7df1c984c1753289600f7f373f3a98a4f09f82acc1be8ecfd5790763a355b
MD5 4f7adc32ec67c1a55853ef828fe58707
SHA1 36de7997949ac3b9b456023fb072b9a8cd84ade8
SHA512 a45e4a20133c842037789157c3ed845afdefbb0d2fe3958d75f0cb3cdfeee106262f9de0e0aca92ac84a0211432cd19773e0f769b970ddb8a80e5f7855676f74
SSDEEP 98304:HMIyl5cyXqgUVcIIsuwHW2doNtUIXmUIHWnS3f1sISlIf9FxefJMb:pyzcyrUVxhB2hXk2nStsHl4VyJ
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

rook ransomware vmprotect

Malware Config

Extracted

Path

C:\PerfLogs\HowToRestoreYourFiles.txt

rook

Ransom Note

-----------Welcome. Again. -------------------- [+]Whats Happen?[+] Your files are encrypted,and currently unavailable. You can check it: all files on you computer has expansion robet. By the way,everything is possible to recover (restore), but you need to follow our instructions. Otherwise, you cant return your data (NEVER). [+] What guarantees?[+] Its just a business. We absolutely do not care about you and your deals, except getting benefits. If we do not do our work and liabilities - nobody will not cooperate with us. Its not in our interests. To check the file capacity, please send 3 files not larger than 1M to us, and we will prove that we are capable of restoring. If you will not cooperate with our service - for us, its does not matter. But you will lose your time and data,cause just we have the private key. In practise - time is much more valuable than money. If we find that a security vendor or law enforcement agency pretends to be you to negotiate with us, we will directly destroy the private key and no longer provide you with decryption services. You have 3 days to contact us for negotiation. Within 3 days, we will provide a 50% discount. If the discount service is not provided for more than 3 days, the files will be leaked to our onion network. Every more than 3 days will increase the number of leaked files. Please use the company email to contact us, otherwise we will not reply. [+] How to get access on website?[+] You have two ways: 1) [Recommended] Using a TOR browser! a) Download and install TOR browser from this site:https://torproject.org/ b) Open our website:gamol6n6p2p4c3ad7gxmx3ur7wwdwlywebo2azv3vv5qlmjmole2zbyd.onion 2) Our mail box: a)[email protected] b)[email protected] c)If the mailbox fails or is taken over, please open Onion Network to check the new mailbox ------------------------------------------------------------------------------------------------ !!!DANGER!!! DONT try to change files by yourself, DONT use any third party software for restoring your data or antivirus solutions - its may entail damge of the private key and, as result, The Loss all data. !!!!!!! AGAIN: Its in your interests to get your files back. From our side, we (the best specialists) make everything for restoring, please should not interfere. !!!!!!! ONE MORE TIME: Security vendors and law enforcement agencies, please be aware that attacks on us will make us even stronger. !!!!!!!

Emails

a)[email protected]
b)[email protected]

Signatures

Rook
Rook is a ransomware which copies from NightSky ransomware.
ransomware rook
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Modifies extensions of user files 21 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File opened for modification	C:\Users\Admin\Pictures\DenyPing.tiff.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\RevokeInitialize.tiff	rook.exe
File opened for modification	C:\Users\Admin\Pictures\UndoMount.tiff	rook.exe
File opened for modification	C:\Users\Admin\Pictures\PublishMeasure.raw.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\SubmitRead.tif => C:\Users\Admin\Pictures\SubmitRead.tif.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\SubmitRead.tif.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\UndoMount.tiff => C:\Users\Admin\Pictures\UndoMount.tiff.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\WatchCompress.png => C:\Users\Admin\Pictures\WatchCompress.png.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\DenyPing.tiff	rook.exe
File renamed	C:\Users\Admin\Pictures\DenyPing.tiff => C:\Users\Admin\Pictures\DenyPing.tiff.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\GetResolve.png => C:\Users\Admin\Pictures\GetResolve.png.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\GetResolve.png.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\WatchCompress.png.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\DisableJoin.png => C:\Users\Admin\Pictures\DisableJoin.png.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\DisableJoin.png.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\DisconnectStop.tif.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\PublishMeasure.raw => C:\Users\Admin\Pictures\PublishMeasure.raw.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\RevokeInitialize.tiff => C:\Users\Admin\Pictures\RevokeInitialize.tiff.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\UndoMount.tiff.Rook	rook.exe
File renamed	C:\Users\Admin\Pictures\DisconnectStop.tif => C:\Users\Admin\Pictures\DisconnectStop.tif.Rook	rook.exe
File opened for modification	C:\Users\Admin\Pictures\RevokeInitialize.tiff.Rook	rook.exe

VMProtect packed file 1 IoCs

Detects executables packed with VMProtect commercial packer.

vmprotect

resource	yara_rule
behavioral1/memory/1192-57-0x000000013FDF0000-0x000000014070D000-memory.dmp	vmprotect

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\T:	rook.exe
File opened (read-only)	\??\Y:	rook.exe
File opened (read-only)	\??\P:	rook.exe
File opened (read-only)	\??\Z:	rook.exe
File opened (read-only)	\??\V:	rook.exe
File opened (read-only)	\??\Q:	rook.exe
File opened (read-only)	\??\R:	rook.exe
File opened (read-only)	\??\G:	rook.exe
File opened (read-only)	\??\H:	rook.exe
File opened (read-only)	\??\J:	rook.exe
File opened (read-only)	\??\K:	rook.exe
File opened (read-only)	\??\B:	rook.exe
File opened (read-only)	\??\W:	rook.exe
File opened (read-only)	\??\O:	rook.exe
File opened (read-only)	\??\S:	rook.exe
File opened (read-only)	\??\L:	rook.exe
File opened (read-only)	\??\N:	rook.exe
File opened (read-only)	\??\U:	rook.exe
File opened (read-only)	\??\A:	rook.exe
File opened (read-only)	\??\F:	rook.exe
File opened (read-only)	\??\X:	rook.exe
File opened (read-only)	\??\M:	rook.exe
File opened (read-only)	\??\E:	rook.exe
File opened (read-only)	\??\I:	rook.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 2 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
1984	vssadmin.exe
1596	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1192	rook.exe
1192	rook.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	1672	vssvc.exe
Token: SeRestorePrivilege	1672	vssvc.exe
Token: SeAuditPrivilege	1672	vssvc.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 1916	1192	rook.exe	29
PID 1192 wrote to memory of 1916	1192	rook.exe	29
PID 1192 wrote to memory of 1916	1192	rook.exe	29
PID 1916 wrote to memory of 1596	1916	cmd.exe	31
PID 1916 wrote to memory of 1596	1916	cmd.exe	31
PID 1916 wrote to memory of 1596	1916	cmd.exe	31
PID 1192 wrote to memory of 2012	1192	rook.exe	35
PID 1192 wrote to memory of 2012	1192	rook.exe	35
PID 1192 wrote to memory of 2012	1192	rook.exe	35
PID 2012 wrote to memory of 1984	2012	cmd.exe	37
PID 2012 wrote to memory of 1984	2012	cmd.exe	37
PID 2012 wrote to memory of 1984	2012	cmd.exe	37

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\rook.exe
"C:\Users\Admin\AppData\Local\Temp\rook.exe"
1⤵
- Modifies extensions of user files
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1916
- - C:\Windows\system32\vssadmin.exe
    vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:1596
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2012
- - C:\Windows\system32\vssadmin.exe
    vssadmin.exe delete shadows /all /quiet
    3⤵
    - Interacts with shadow copies
    PID:1984

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1672

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File Deletion

2

T1107

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

2

T1490

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HowToRestoreYourFiles.txt

Path C:\PerfLogs\HowToRestoreYourFiles.txt
Size 2KB
SHA256 b14ec2fcccac5059464e800edf56049c0277124abd60ee49c1f726861df925bf
MD5 00f71cde522689585eaa9c62385afa22
SHA1 350e319806f7a71267a5e4a749eb190ead38dbb0
SHA512 47442d335f16e259c4593370467c741ac2b41f329330afdd649b89b44c4233edd7d2af70883403993d6022c617235c20b89ae667ca4b3f82d678836adc34f4df
MD5 SHA1 SHA512

Submit Download

memory/1192-54-0x00000000776F0000-0x00000000776F2000-memory.dmp

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memory/1192-55-0x00000000776F0000-0x00000000776F2000-memory.dmp

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memory/1192-56-0x00000000776F0000-0x00000000776F2000-memory.dmp

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memory/1192-57-0x000000013FDF0000-0x000000014070D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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