ransomexx_win | c5741701b3866459dd1ffa2477cfd8776713612912693a5897f78aac795d23e9

Data Destruction

T1485

pid	Process
3028	fsutil.exe

RansomEXX Ransomware
Targeted ransomware with variants which affect Windows and Linux systems.
ransomware ransomexx_win

Clears Windows event logs 1 TTPs 4 IoCs

evasion ransomware

Indicator Removal on Host

T1070

pid	Process
1816	wevtutil.exe
4140	wevtutil.exe
2276	wevtutil.exe
4448	wevtutil.exe

Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs

ransomware evasion

Inhibit System Recovery

pid	Process
1848	bcdedit.exe
4572	bcdedit.exe

Deletes backup catalog 3 TTPs 1 IoCs

Uses wbadmin.exe to inhibit system recovery.

ransomware

Command-Line Interface

T1059

File Deletion

T1107

Inhibit System Recovery

pid	Process
1960	wbadmin.exe

Disables use of System Restore points 1 TTPs
evasion

Inhibit System Recovery
T1490

Modifies extensions of user files 1 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Users\Admin\Pictures\TraceGrant.raw => C:\Users\Admin\Pictures\TraceGrant.raw.txd0t	RansomEXX_14_12_2020_156KB.exe

Overwrites deleted data with Cipher tool 1 TTPs
Cipher is a Windows tool which be used to securely wipe deallocated HDD space, preventing recovery of deleted data.
ransomware

Inhibit System Recovery
T1490

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	RansomEXX_14_12_2020_156KB.exe

Enumerates connected drives 3 TTPs 1 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
File opened (read-only)	\??\D:	cipher.exe

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

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 4 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_DADY&PROD_HARDDISK\4&215468A5&0&000000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	vds.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_DADY&PROD_DADY_DVD-ROM\4&215468A5&0&010000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000\FriendlyName	vds.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe
3172	RansomEXX_14_12_2020_156KB.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

description	pid	Process
Token: SeSecurityPrivilege	4252	wevtutil.exe
Token: SeBackupPrivilege	4252	wevtutil.exe
Token: SeSecurityPrivilege	2276	wevtutil.exe
Token: SeBackupPrivilege	2276	wevtutil.exe
Token: SeSecurityPrivilege	4140	wevtutil.exe
Token: SeBackupPrivilege	4140	wevtutil.exe
Token: SeSecurityPrivilege	4448	wevtutil.exe
Token: SeBackupPrivilege	4448	wevtutil.exe
Token: SeSecurityPrivilege	1816	wevtutil.exe
Token: SeBackupPrivilege	1816	wevtutil.exe
Token: SeBackupPrivilege	4476	wbengine.exe
Token: SeRestorePrivilege	4476	wbengine.exe
Token: SeSecurityPrivilege	4476	wbengine.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3172 wrote to memory of 2276	3172	RansomEXX_14_12_2020_156KB.exe	96
PID 3172 wrote to memory of 2276	3172	RansomEXX_14_12_2020_156KB.exe	96
PID 3172 wrote to memory of 2676	3172	RansomEXX_14_12_2020_156KB.exe	95
PID 3172 wrote to memory of 2676	3172	RansomEXX_14_12_2020_156KB.exe	95
PID 3172 wrote to memory of 2676	3172	RansomEXX_14_12_2020_156KB.exe	95
PID 3172 wrote to memory of 4140	3172	RansomEXX_14_12_2020_156KB.exe	93
PID 3172 wrote to memory of 4140	3172	RansomEXX_14_12_2020_156KB.exe	93
PID 3172 wrote to memory of 3028	3172	RansomEXX_14_12_2020_156KB.exe	92
PID 3172 wrote to memory of 3028	3172	RansomEXX_14_12_2020_156KB.exe	92
PID 3172 wrote to memory of 1960	3172	RansomEXX_14_12_2020_156KB.exe	91
PID 3172 wrote to memory of 1960	3172	RansomEXX_14_12_2020_156KB.exe	91
PID 3172 wrote to memory of 1848	3172	RansomEXX_14_12_2020_156KB.exe	90
PID 3172 wrote to memory of 1848	3172	RansomEXX_14_12_2020_156KB.exe	90
PID 3172 wrote to memory of 1816	3172	RansomEXX_14_12_2020_156KB.exe	89
PID 3172 wrote to memory of 1816	3172	RansomEXX_14_12_2020_156KB.exe	89
PID 3172 wrote to memory of 4252	3172	RansomEXX_14_12_2020_156KB.exe	88
PID 3172 wrote to memory of 4252	3172	RansomEXX_14_12_2020_156KB.exe	88
PID 3172 wrote to memory of 3444	3172	RansomEXX_14_12_2020_156KB.exe	87
PID 3172 wrote to memory of 3444	3172	RansomEXX_14_12_2020_156KB.exe	87
PID 3172 wrote to memory of 700	3172	RansomEXX_14_12_2020_156KB.exe	85
PID 3172 wrote to memory of 700	3172	RansomEXX_14_12_2020_156KB.exe	85
PID 3172 wrote to memory of 700	3172	RansomEXX_14_12_2020_156KB.exe	85
PID 3172 wrote to memory of 4448	3172	RansomEXX_14_12_2020_156KB.exe	86
PID 3172 wrote to memory of 4448	3172	RansomEXX_14_12_2020_156KB.exe	86
PID 3172 wrote to memory of 4572	3172	RansomEXX_14_12_2020_156KB.exe	94
PID 3172 wrote to memory of 4572	3172	RansomEXX_14_12_2020_156KB.exe	94

C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\RansomEXX_14_12_2020_156KB.exe
"C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\RansomEXX_14_12_2020_156KB.exe"
1⤵
- Modifies extensions of user files
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3172
- C:\Windows\SysWOW64\cipher.exe
  "C:\Windows\System32\cipher.exe" /w:D:
  2⤵
  - Enumerates connected drives
  PID:700
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Application
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:4448
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Change /TN "\Microsoft\Windows\SystemRestore\SR" /disable
  2⤵
  PID:3444
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" sl Security /e:false
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4252
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Security
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:1816
- C:\Windows\System32\bcdedit.exe
  "C:\Windows\System32\bcdedit.exe" /set {default} recoveryenabled no
  2⤵
  - Modifies boot configuration data using bcdedit
  PID:1848
- C:\Windows\System32\wbadmin.exe
  "C:\Windows\System32\wbadmin.exe" delete catalog -quiet
  2⤵
  - Deletes backup catalog
  PID:1960
- C:\Windows\System32\fsutil.exe
  "C:\Windows\System32\fsutil.exe" usn deletejournal /D C:
  2⤵
  - Deletes NTFS Change Journal
  PID:3028
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl System
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:4140
- C:\Windows\System32\bcdedit.exe
  "C:\Windows\System32\bcdedit.exe" /set {default} bootstatuspolicy ignoreallfailures
  2⤵
  - Modifies boot configuration data using bcdedit
  PID:4572
- C:\Windows\SysWOW64\cipher.exe
  "C:\Windows\System32\cipher.exe" /w:C:
  2⤵
  PID:2676
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Setup
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:2276

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4476

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:3252

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
- Checks SCSI registry key(s)
PID:3944

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Command-Line Interface

T1059

Persistence

Privilege Escalation

Defense Evasion

File Deletion

T1107

Indicator Removal on Host

T1070

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Data Destruction

T1485

Inhibit System Recovery