gandcrab | c7f88943301b4e6fdc6f2823932b3d5d7d24a40e114e1399e5c42c4d18b2aed9

General

Target

new.exe
Size

1.8MB
MD5

8403bb69eae17501273aee13975187cd
SHA1

339f17f5fa257ff7f274f9b765e416645564f8c6
SHA256

c7f88943301b4e6fdc6f2823932b3d5d7d24a40e114e1399e5c42c4d18b2aed9
SHA512

4aff32fbb1aaba3eb87b06d59aa48a53d279eddae71c547459b60d13a7bd9005a6fd38396476b1af4fc511c6ff24be3f2502200b51cc30a4a7b3db18f0f209cd

Score

10^/10

gandcrab backdoor ransomware

Malware Config

Extracted

Path

C:\SIYWRZTS-DECRYPT.txt

Ransom Note

---= GANDCRAB V5.0.3 =--- ***********************UNDER NO CIRCUMSTANCES DO NOT DELETE THIS FILE, UNTIL ALL YOUR DATA IS RECOVERED*********************** *****FAILING TO DO SO, WILL RESULT IN YOUR SYSTEM CORRUPTION, IF THERE WILL BE DECRYPTION ERRORS***** Attention! All your files, documents, photos, databases and other important files are encrypted and have the extension: .SIYWRZTS The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. The server with your key is in a closed network TOR. You can get there by the following ways: ---------------------------------------------------------------------------------------- | 0. Download Tor browser - https://www.torproject.org/ | 1. Install Tor browser | 2. Open Tor Browser | 3. Open link in TOR browser: http://gandcrabmfe6mnef.onion/234ab49c3636cc56 | 4. Follow the instructions on this page ---------------------------------------------------------------------------------------- On our page you will see instructions on payment and get the opportunity to decrypt 1 file for free. ATTENTION! IN ORDER TO PREVENT DATA DAMAGE: * DO NOT MODIFY ENCRYPTED FILES * DO NOT CHANGE DATA BELOW ---BEGIN GANDCRAB KEY--- lAQAAM+PXBcBHQ/nKtkaWjlI/y/Az4PYSkRUPhxd0N8SMn89DTlxex0LutvPN9014+UpKxQUloVyy+JfN6ixeZz3U4PNwuxT1Nh/3BzbPCijZC6atAC7LCFMuTG5y161uU6gbJA21vgSZPlk3lLifd3jRxYi5y0Ba8JGzUqL2sv+YUOAyKrC81/K4UWvVYhW9xQ51wFv4qu4su8qBP2A7SogkyAOye4wrhpgBKeY/UWzDC/zf/AKuAh5ikkwIvgTsVYYlLdZu/S7H76xtSlw7s8N/Gh4OGUxiFsYYODUqBGagvzpDQvWEEXyluczTM01xezDfOJ7jC9MFaU5aiwv7qIj1VYB7YT7Vwa/7dnVcKewPPcu/CHJiGadPqtujWDoTdPDtmM8znr66tQaYP5L92KhcYRCKkMR5n2/WE1Lzmls9bEGqpNmBFi2XcJOgQyT+mdECm+CsRg1xkocOd9MEM3UYhWB3H092wkYf6IM2K8fGNiZFwQ89xnpdRSDrJKTHVYC6Feox1qeK/xOtZeofdRwZt0o6mmiKSLTi7+kwwuGA2gV4Ou138em8QzxoTfaEvknJv7pYVriKAWeKCvBXwWNf5uqURA6kQgHcA2CK49HEFWbB9CD+BbiiEsHdBHuaZv22UyTyk3Jq6vemsboXMp3S9WFbT3nnMbuM2W2DPtQN4WdfI12mL9pnDP5BopfvahyzwG3RDtrb9TcqghF2Vb+XuMbqZD+8zRwx1wbcgV2ZAW7mX97lCAb0kfy6mmH7OKR/nHPWr5thKSWkHXrAu9f4RXljmvw6TlHWU1Fsd1hjqFIklfynnc7IRRmXLpCiwHNElnHsSEPnA+W0fLGUdHh/i/To7osqbRZywane/M8p5ro575cpRG/+5G3XN4/9+yKk3qGZyySlQx3SFePxH/EyVOh/+oJS2VjpygtAoNGelbUxQ0MMrirvjZcrzXaec15mjAhCdKy9lKWfy0wOBtfA1PbXQ2+68Gy5E0gmkmLJA8IXfV880aH0EsfYEX0wjaODd10KrK9Ta3LMwlEq6EnCkXygjrCsY3cSIULLGf3g/NHWjMmRhw1fzSucXn38V/jISKx8x2BsRGhmZAcCnjIoLPIfH919ep3O2IzL1NvAEe5cxrRhBg3LO6FfMLG1kqagcLWNm5nO1/I7xFEKu+d7XDAeiAgL3DYRQOpfq79Twz5AvTAtfMoXqJUFdCcOPBEh4Ema4Ah5HkXrm5MDQ9OmxdLsQWMr6V0Y3y8kcXGDCEeF89cltclIQzC2PidkWtEKvQy2MWIr6I9F9mBYWAyJVgGlDs4HomipgzbqrwbYWwf0TUdMjGJjbEhDXqfrQNFvbdSmNaQYzoVsc6qGG2jPFy/yOWEzoS674rpOAUtJO3DRSd71tc8tB1qhzg86TSyZVOXRuxqagR0ZwoYDnPyKVJhAyj2HU6MSlIEQhNP3XtY+A3Us7B5HXxgVuIU4Ei6l8VqYGr5TX6QZbqKFsP/7qUtjWAXaDwow3bPDNvOdYzcFM/Kck55eT1nbznVJzY34Nf0Pw2W/rPoTgpCBeyfM7K7tBL4P6BpeBPqbjfEZv9isW4ISYRvxpUNSlmKy8nqkPFt8/Vj7vJSh40qZsGevLAXTp4B7W7HgRO1aQo1xlln6onhP6wY0ujcBUaNCpYhEGY2pORnVFXG9iJTL3fear+2GtR772vkUe3oohVsUltLyY6oyQ4Nxp4Jw88m5DFYbcrMbp75HPMhAZ7Aom0f7NtlJwgpRdNbhkUXlRJXBpma3rXmyRofHfCrTesbiT9l1jhNU5bgG9lon6tAMsVDAVgZXe1Yu+DfUosonDt47TK7SNiYhjOM/IVgtQC5A7Twg7mM4br8b4Qg1uUqO5lo+hYFAJumdAiBY7vzObWEK83TbRCHNgjErUcd8x1T4D+j52CBasR2TJP+yHDARVaVzIkBRaB8KodBw+6YX9RB8ILzPGK08LmNNweaAEUPpGqg50Hkozmyqad8QMZW7gnt7F0MOBT4yi+QPTLCnOHF4A8xWj9NkmhYIcjBJ8HZFpieebZjRnBXAX+ZrZhHmC9FijF2iT8JqhIN44L+bCl1RSlbqSTsCb0QKqX12jgN8k69ISpmmMlacmZDp0kBqaWzdYDad6lUNBI9zrTI5AbeANPPTTUUeHr60xaNu/tcbsKeRzZe6Xqf+FvmHZ1hINgcYhFrhY+EXL6H/GUPWGQizqTGtRgEdtOdzZ9Ih5d81bygtbCvSOI= ---END GANDCRAB KEY--- ---BEGIN PC DATA--- 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 ---END PC DATA---

URLs

http://gandcrabmfe6mnef.onion/234ab49c3636cc56

Signatures

Gandcrab
Gandcrab is a Trojan horse that encrypts files on a computer.
ransomware backdoor gandcrab
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 9 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

wermgr.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\UpdateJoin.png => C:\Users\Admin\Pictures\UpdateJoin.png.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\DenyAdd.crw => C:\Users\Admin\Pictures\DenyAdd.crw.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\EditStart.tiff => C:\Users\Admin\Pictures\EditStart.tiff.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\GrantUninstall.tif => C:\Users\Admin\Pictures\GrantUninstall.tif.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\GetOptimize.crw => C:\Users\Admin\Pictures\GetOptimize.crw.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\InstallBackup.raw => C:\Users\Admin\Pictures\InstallBackup.raw.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\BackupApprove.raw => C:\Users\Admin\Pictures\BackupApprove.raw.siywrzts	wermgr.exe
File renamed	C:\Users\Admin\Pictures\CompressSwitch.tif => C:\Users\Admin\Pictures\CompressSwitch.tif.siywrzts	wermgr.exe
File opened for modification	C:\Users\Admin\Pictures\EditStart.tiff	wermgr.exe

Drops startup file 2 IoCs

Processes:

wermgr.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\SIYWRZTS-DECRYPT.txt	wermgr.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Word\STARTUP\3636cbb53636cc5511d.lock	wermgr.exe

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

Processes:

wermgr.exe

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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

Processes:

wermgr.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\\\pidor.bmp"	wermgr.exe

Drops file in Program Files directory 27 IoCs

Processes:

wermgr.exe

description	ioc	process
File created	C:\Program Files (x86)\SIYWRZTS-DECRYPT.txt	wermgr.exe
File opened for modification	C:\Program Files\AddDisable.ppt	wermgr.exe
File opened for modification	C:\Program Files\MountDisconnect.cr2	wermgr.exe
File opened for modification	C:\Program Files\ShowClose.aifc	wermgr.exe
File opened for modification	C:\Program Files\SplitImport.emf	wermgr.exe
File created	C:\Program Files\SIYWRZTS-DECRYPT.txt	wermgr.exe
File opened for modification	C:\Program Files\ProtectUnprotect.vsd	wermgr.exe
File opened for modification	C:\Program Files\RenameUnblock.ppsm	wermgr.exe
File opened for modification	C:\Program Files\SaveClose.mp3	wermgr.exe
File created	C:\Program Files (x86)\3636cbb53636cc5511d.lock	wermgr.exe
File opened for modification	C:\Program Files\UnpublishUndo.pps	wermgr.exe
File opened for modification	C:\Program Files\WatchLimit.mp4	wermgr.exe
File opened for modification	C:\Program Files\SelectSplit.wmx	wermgr.exe
File opened for modification	C:\Program Files\ClearRestore.zip	wermgr.exe
File opened for modification	C:\Program Files\RevokeConvert.M2TS	wermgr.exe
File opened for modification	C:\Program Files\RevokeSave.pptx	wermgr.exe
File opened for modification	C:\Program Files\SkipAdd.mp4	wermgr.exe
File opened for modification	C:\Program Files\InstallPublish.M2T	wermgr.exe
File opened for modification	C:\Program Files\LockAdd.docx	wermgr.exe
File opened for modification	C:\Program Files\PublishReset.search-ms	wermgr.exe
File opened for modification	C:\Program Files\SearchPop.ppsm	wermgr.exe
File created	C:\Program Files\3636cbb53636cc5511d.lock	wermgr.exe
File opened for modification	C:\Program Files\BackupGroup.3g2	wermgr.exe
File opened for modification	C:\Program Files\CompleteDeny.M2TS	wermgr.exe
File opened for modification	C:\Program Files\EnableResume.wpl	wermgr.exe
File opened for modification	C:\Program Files\EnterLock.m1v	wermgr.exe
File opened for modification	C:\Program Files\SaveExpand.eprtx	wermgr.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

wermgr.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	wermgr.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	wermgr.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	wermgr.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

wermgr.exe

pid process

3948 wermgr.exe
3948 wermgr.exe
3948 wermgr.exe
3948 wermgr.exe

pid	process
3948	wermgr.exe
3948	wermgr.exe
3948	wermgr.exe
3948	wermgr.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

Processes:

wmic.exevssvc.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	4796	wmic.exe
Token: SeSecurityPrivilege	4796	wmic.exe
Token: SeTakeOwnershipPrivilege	4796	wmic.exe
Token: SeLoadDriverPrivilege	4796	wmic.exe
Token: SeSystemProfilePrivilege	4796	wmic.exe
Token: SeSystemtimePrivilege	4796	wmic.exe
Token: SeProfSingleProcessPrivilege	4796	wmic.exe
Token: SeIncBasePriorityPrivilege	4796	wmic.exe
Token: SeCreatePagefilePrivilege	4796	wmic.exe
Token: SeBackupPrivilege	4796	wmic.exe
Token: SeRestorePrivilege	4796	wmic.exe
Token: SeShutdownPrivilege	4796	wmic.exe
Token: SeDebugPrivilege	4796	wmic.exe
Token: SeSystemEnvironmentPrivilege	4796	wmic.exe
Token: SeRemoteShutdownPrivilege	4796	wmic.exe
Token: SeUndockPrivilege	4796	wmic.exe
Token: SeManageVolumePrivilege	4796	wmic.exe
Token: 33	4796	wmic.exe
Token: 34	4796	wmic.exe
Token: 35	4796	wmic.exe
Token: 36	4796	wmic.exe
Token: SeIncreaseQuotaPrivilege	4796	wmic.exe
Token: SeSecurityPrivilege	4796	wmic.exe
Token: SeTakeOwnershipPrivilege	4796	wmic.exe
Token: SeLoadDriverPrivilege	4796	wmic.exe
Token: SeSystemProfilePrivilege	4796	wmic.exe
Token: SeSystemtimePrivilege	4796	wmic.exe
Token: SeProfSingleProcessPrivilege	4796	wmic.exe
Token: SeIncBasePriorityPrivilege	4796	wmic.exe
Token: SeCreatePagefilePrivilege	4796	wmic.exe
Token: SeBackupPrivilege	4796	wmic.exe
Token: SeRestorePrivilege	4796	wmic.exe
Token: SeShutdownPrivilege	4796	wmic.exe
Token: SeDebugPrivilege	4796	wmic.exe
Token: SeSystemEnvironmentPrivilege	4796	wmic.exe
Token: SeRemoteShutdownPrivilege	4796	wmic.exe
Token: SeUndockPrivilege	4796	wmic.exe
Token: SeManageVolumePrivilege	4796	wmic.exe
Token: 33	4796	wmic.exe
Token: 34	4796	wmic.exe
Token: 35	4796	wmic.exe
Token: 36	4796	wmic.exe
Token: SeBackupPrivilege	4808	vssvc.exe
Token: SeRestorePrivilege	4808	vssvc.exe
Token: SeAuditPrivilege	4808	vssvc.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

new.exewermgr.exe

description	pid	process	target process
PID 3136 wrote to memory of 3948	3136	new.exe	wermgr.exe
PID 3136 wrote to memory of 3948	3136	new.exe	wermgr.exe
PID 3136 wrote to memory of 3948	3136	new.exe	wermgr.exe
PID 3136 wrote to memory of 3948	3136	new.exe	wermgr.exe
PID 3136 wrote to memory of 3948	3136	new.exe	wermgr.exe
PID 3948 wrote to memory of 4796	3948	wermgr.exe	wmic.exe
PID 3948 wrote to memory of 4796	3948	wermgr.exe	wmic.exe
PID 3948 wrote to memory of 4796	3948	wermgr.exe	wmic.exe

C:\Users\Admin\AppData\Local\Temp\new.exe
"C:\Users\Admin\AppData\Local\Temp\new.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3136

C:\Windows\SysWOW64\wermgr.exe
"C:\Windows\System32\wermgr.exe"
2⤵
- Modifies extensions of user files
- Drops startup file
- Enumerates connected drives
- Sets desktop wallpaper using registry
- Drops file in Program Files directory
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3948

C:\Windows\SysWOW64\wbem\wmic.exe
"C:\Windows\system32\wbem\wmic.exe" shadowcopy delete
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:4796

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4808

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File Deletion

1

T1107

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

Peripheral Device Discovery

1

T1120

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Inhibit System Recovery

1

T1490

Defacement

1

T1491

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Downloads

memory/3136-130-0x0000000000400000-0x00000000005CE000-memory.dmp

Filesize
1.8MB

Download
memory/3948-131-0x0000000000000000-mapping.dmp

Download
memory/4796-132-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads