ransomexx_win | c5741701b3866459dd1ffa2477cfd8776713612912693a5897f78aac795d23e9

defense_evasion ransomware

Data Destruction

T1485

pid	Process
1976	fsutil.exe

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

Clears Windows event logs 1 TTPs 4 IoCs

Clear Windows Event Logs

T1070.001

pid	Process
6124	wevtutil.exe
3712	wevtutil.exe
880	wevtutil.exe
2832	wevtutil.exe

Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs

ransomware evasion

Inhibit System Recovery

pid	Process
4544	bcdedit.exe
3540	bcdedit.exe

Renames multiple (181) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Deletes backup catalog 3 TTPs 1 IoCs

Uses wbadmin.exe to inhibit system recovery.

ransomware

Command and Scripting Interpreter

T1059

File Deletion

T1070.004

Inhibit System Recovery

pid	Process
4112	wbadmin.exe

Disables use of System Restore points 1 TTPs
defense_evasion

Inhibit System Recovery
T1490
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-1-5-21-3920955164-3782810283-1225622749-1000\Control Panel\International\Geo\Nation	RansomEXX_14_12_2020_156KB.exe

Enumerates connected drives 3 TTPs 2 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
File opened (read-only)	\??\F:	cipher.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cipher.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cipher.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cipher.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RansomEXX_14_12_2020_156KB.exe

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_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName	vds.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName	vds.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe
2940	RansomEXX_14_12_2020_156KB.exe

Suspicious use of AdjustPrivilegeToken 13 IoCs

description	pid	Process
Token: SeSecurityPrivilege	6124	wevtutil.exe
Token: SeBackupPrivilege	6124	wevtutil.exe
Token: SeSecurityPrivilege	880	wevtutil.exe
Token: SeBackupPrivilege	880	wevtutil.exe
Token: SeSecurityPrivilege	2832	wevtutil.exe
Token: SeBackupPrivilege	2832	wevtutil.exe
Token: SeSecurityPrivilege	3712	wevtutil.exe
Token: SeBackupPrivilege	3712	wevtutil.exe
Token: SeBackupPrivilege	5780	wbengine.exe
Token: SeRestorePrivilege	5780	wbengine.exe
Token: SeSecurityPrivilege	5780	wbengine.exe
Token: SeSecurityPrivilege	3432	wevtutil.exe
Token: SeBackupPrivilege	3432	wevtutil.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2940 wrote to memory of 4112	2940	RansomEXX_14_12_2020_156KB.exe	113
PID 2940 wrote to memory of 4112	2940	RansomEXX_14_12_2020_156KB.exe	113
PID 2940 wrote to memory of 3432	2940	RansomEXX_14_12_2020_156KB.exe	114
PID 2940 wrote to memory of 3432	2940	RansomEXX_14_12_2020_156KB.exe	114
PID 2940 wrote to memory of 880	2940	RansomEXX_14_12_2020_156KB.exe	118
PID 2940 wrote to memory of 880	2940	RansomEXX_14_12_2020_156KB.exe	118
PID 2940 wrote to memory of 3540	2940	RansomEXX_14_12_2020_156KB.exe	115
PID 2940 wrote to memory of 3540	2940	RansomEXX_14_12_2020_156KB.exe	115
PID 2940 wrote to memory of 2832	2940	RansomEXX_14_12_2020_156KB.exe	117
PID 2940 wrote to memory of 2832	2940	RansomEXX_14_12_2020_156KB.exe	117
PID 2940 wrote to memory of 1976	2940	RansomEXX_14_12_2020_156KB.exe	116
PID 2940 wrote to memory of 1976	2940	RansomEXX_14_12_2020_156KB.exe	116
PID 2940 wrote to memory of 5408	2940	RansomEXX_14_12_2020_156KB.exe	119
PID 2940 wrote to memory of 5408	2940	RansomEXX_14_12_2020_156KB.exe	119
PID 2940 wrote to memory of 5408	2940	RansomEXX_14_12_2020_156KB.exe	119
PID 2940 wrote to memory of 1924	2940	RansomEXX_14_12_2020_156KB.exe	120
PID 2940 wrote to memory of 1924	2940	RansomEXX_14_12_2020_156KB.exe	120
PID 2940 wrote to memory of 1924	2940	RansomEXX_14_12_2020_156KB.exe	120
PID 2940 wrote to memory of 4544	2940	RansomEXX_14_12_2020_156KB.exe	122
PID 2940 wrote to memory of 4544	2940	RansomEXX_14_12_2020_156KB.exe	122
PID 2940 wrote to memory of 3712	2940	RansomEXX_14_12_2020_156KB.exe	121
PID 2940 wrote to memory of 3712	2940	RansomEXX_14_12_2020_156KB.exe	121
PID 2940 wrote to memory of 6124	2940	RansomEXX_14_12_2020_156KB.exe	123
PID 2940 wrote to memory of 6124	2940	RansomEXX_14_12_2020_156KB.exe	123
PID 2940 wrote to memory of 3196	2940	RansomEXX_14_12_2020_156KB.exe	124
PID 2940 wrote to memory of 3196	2940	RansomEXX_14_12_2020_156KB.exe	124
PID 2940 wrote to memory of 3196	2940	RansomEXX_14_12_2020_156KB.exe	124
PID 2940 wrote to memory of 5352	2940	RansomEXX_14_12_2020_156KB.exe	125
PID 2940 wrote to memory of 5352	2940	RansomEXX_14_12_2020_156KB.exe	125

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

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 bcdedit /set shutdown /r /f /t 2
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2940
- C:\Windows\System32\wbadmin.exe
  "C:\Windows\System32\wbadmin.exe" delete catalog -quiet
  2⤵
  - Deletes backup catalog
  PID:4112
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" sl Security /e:false
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3432
- C:\Windows\System32\bcdedit.exe
  "C:\Windows\System32\bcdedit.exe" /set {default} recoveryenabled no
  2⤵
  - Modifies boot configuration data using bcdedit
  PID:3540
- C:\Windows\System32\fsutil.exe
  "C:\Windows\System32\fsutil.exe" usn deletejournal /D C:
  2⤵
  - Deletes NTFS Change Journal
  PID:1976
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Security
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:2832
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Setup
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:880
- C:\Windows\SysWOW64\cipher.exe
  "C:\Windows\System32\cipher.exe" /w:F:
  2⤵
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  PID:5408
- C:\Windows\SysWOW64\cipher.exe
  "C:\Windows\System32\cipher.exe" /w:D:
  2⤵
  - Enumerates connected drives
  - System Location Discovery: System Language Discovery
  PID:1924
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl Application
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:3712
- C:\Windows\System32\bcdedit.exe
  "C:\Windows\System32\bcdedit.exe" /set {default} bootstatuspolicy ignoreallfailures
  2⤵
  - Modifies boot configuration data using bcdedit
  PID:4544
- C:\Windows\System32\wevtutil.exe
  "C:\Windows\System32\wevtutil.exe" cl System
  2⤵
  - Clears Windows event logs
  - Suspicious use of AdjustPrivilegeToken
  PID:6124
- C:\Windows\SysWOW64\cipher.exe
  "C:\Windows\System32\cipher.exe" /w:C:
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3196
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Change /TN "\Microsoft\Windows\SystemRestore\SR" /disable
  2⤵
  PID:5352

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5780

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2444

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
- Checks SCSI registry key(s)
PID:5388

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

Clear Windows Event Logs

T1070.001

File Deletion

T1070.004

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Data Destruction

T1485

Inhibit System Recovery