wastedlocker | 0e061255b12ade5dc10f4ad9aeca9ebe5496d28ed251acb376c66c1d9f405821

Analysis

max time kernel
66s
max time network
6s
platform
windows10_x64
resource
win10
submitted
01-08-2020 09:49

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General

Target

lock.exe
Size

112KB
MD5

d01fc079881dc0d33a88e4f8df1ae7ce
SHA1

c40c8848808da12ef78c68de1e6477b862161a43
SHA256

0e061255b12ade5dc10f4ad9aeca9ebe5496d28ed251acb376c66c1d9f405821
SHA512

83bca79d1f0ac14c6d79685fd192964e7117e8c9c734036abddfdbb068c801ff38027a0812a2499e1d9e528a47af07150cafee27384b5a78b8fc32c23bd21130

Score

10^/10

persistence discovery ransomware exploit wastedlocker

Malware Config

Signatures

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 3536 wrote to memory of 3720	3536	lock.exe	67
PID 3536 wrote to memory of 3720	3536	lock.exe	67
PID 3536 wrote to memory of 3720	3536	lock.exe	67
PID 3720 wrote to memory of 3848	3720	Session:bin	68
PID 3720 wrote to memory of 3848	3720	Session:bin	68
PID 3720 wrote to memory of 3744	3720	Session:bin	72
PID 3720 wrote to memory of 3744	3720	Session:bin	72
PID 3720 wrote to memory of 3744	3720	Session:bin	72
PID 3720 wrote to memory of 3308	3720	Session:bin	74
PID 3720 wrote to memory of 3308	3720	Session:bin	74
PID 3720 wrote to memory of 3308	3720	Session:bin	74
PID 1664 wrote to memory of 3684	1664	Session.exe	78
PID 1664 wrote to memory of 3684	1664	Session.exe	78
PID 1664 wrote to memory of 3684	1664	Session.exe	78
PID 3684 wrote to memory of 2196	3684	cmd.exe	80
PID 3684 wrote to memory of 2196	3684	cmd.exe	80
PID 3684 wrote to memory of 2196	3684	cmd.exe	80
PID 3720 wrote to memory of 1780	3720	Session:bin	81
PID 3720 wrote to memory of 1780	3720	Session:bin	81
PID 3720 wrote to memory of 1780	3720	Session:bin	81
PID 3536 wrote to memory of 1888	3536	lock.exe	83
PID 3536 wrote to memory of 1888	3536	lock.exe	83
PID 3536 wrote to memory of 1888	3536	lock.exe	83
PID 1780 wrote to memory of 2536	1780	cmd.exe	85
PID 1780 wrote to memory of 2536	1780	cmd.exe	85
PID 1780 wrote to memory of 2536	1780	cmd.exe	85
PID 1888 wrote to memory of 404	1888	cmd.exe	86
PID 1888 wrote to memory of 404	1888	cmd.exe	86
PID 1888 wrote to memory of 404	1888	cmd.exe	86
PID 3684 wrote to memory of 3892	3684	cmd.exe	87
PID 3684 wrote to memory of 3892	3684	cmd.exe	87
PID 3684 wrote to memory of 3892	3684	cmd.exe	87
PID 1780 wrote to memory of 664	1780	cmd.exe	88
PID 1780 wrote to memory of 664	1780	cmd.exe	88
PID 1780 wrote to memory of 664	1780	cmd.exe	88
PID 1888 wrote to memory of 244	1888	cmd.exe	89
PID 1888 wrote to memory of 244	1888	cmd.exe	89
PID 1888 wrote to memory of 244	1888	cmd.exe	89

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	3804	vssvc.exe
Token: SeRestorePrivilege	3804	vssvc.exe
Token: SeAuditPrivilege	3804	vssvc.exe

Modifies service 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Modify Existing Service

T1031

description	ioc	Process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Registry Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\SwProvider_{b5946137-7b9f-4925-af80-51abd60b20d5}	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\COM+ REGDB Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\ASR Writer	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Shadow Copy Optimization Writer	vssvc.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3744	takeown.exe
3308	icacls.exe

WastedLocker
Ransomware family seen in the wild since May 2020.
ransomware wastedlocker
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Session.exe	Session:bin
File opened for modification	C:\Windows\SysWOW64\Session.exe	attrib.exe

Executes dropped EXE 2 IoCs

pid	Process
3720	Session:bin
1664	Session.exe

Modifies extensions of user files 18 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Users\Admin\Pictures\MoveSearch.tiff => C:\Users\Admin\Pictures\MoveSearch.tiff.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\RequestRepair.crw.tcwwasted_info	Session.exe
File opened for modification	C:\Users\Admin\Pictures\RequestRepair.crw.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\StartExit.tif.tcwwasted_info	Session.exe
File renamed	C:\Users\Admin\Pictures\DismountEdit.png => C:\Users\Admin\Pictures\DismountEdit.png.tcwwasted	Session.exe
File opened for modification	C:\Users\Admin\Pictures\DismountEdit.png.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\MoveSearch.tiff.tcwwasted_info	Session.exe
File renamed	C:\Users\Admin\Pictures\StartExit.tif => C:\Users\Admin\Pictures\StartExit.tif.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\WaitCopy.png.tcwwasted_info	Session.exe
File renamed	C:\Users\Admin\Pictures\RequestRepair.crw => C:\Users\Admin\Pictures\RequestRepair.crw.tcwwasted	Session.exe
File renamed	C:\Users\Admin\Pictures\SelectRedo.tif => C:\Users\Admin\Pictures\SelectRedo.tif.tcwwasted	Session.exe
File opened for modification	C:\Users\Admin\Pictures\WaitCopy.png.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\DismountEdit.png.tcwwasted_info	Session.exe
File opened for modification	C:\Users\Admin\Pictures\MoveSearch.tiff.tcwwasted	Session.exe
File created	C:\Users\Admin\Pictures\SelectRedo.tif.tcwwasted_info	Session.exe
File opened for modification	C:\Users\Admin\Pictures\SelectRedo.tif.tcwwasted	Session.exe
File opened for modification	C:\Users\Admin\Pictures\StartExit.tif.tcwwasted	Session.exe
File renamed	C:\Users\Admin\Pictures\WaitCopy.png => C:\Users\Admin\Pictures\WaitCopy.png.tcwwasted	Session.exe

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
3744	takeown.exe
3308	icacls.exe

Views/modifies file attributes 1 TTPs 3 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
3892	attrib.exe
664	attrib.exe
244	attrib.exe

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Session:bin	lock.exe

Interacts with shadow copies 2 TTPs 1 IoCs

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

ransomware

File Deletion

T1107

Inhibit System Recovery

T1490

pid	Process
3848	vssadmin.exe

C:\Users\Admin\AppData\Local\Temp\lock.exe
"C:\Users\Admin\AppData\Local\Temp\lock.exe"
1⤵
- Suspicious use of WriteProcessMemory
- NTFS ADS
PID:3536
- C:\Users\Admin\AppData\Roaming\Session:bin
  C:\Users\Admin\AppData\Roaming\Session:bin -r
  2⤵
  - Suspicious use of WriteProcessMemory
  - Drops file in System32 directory
  - Executes dropped EXE
  PID:3720
- - C:\Windows\system32\vssadmin.exe
    C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - Interacts with shadow copies
    PID:3848
- - C:\Windows\SysWOW64\takeown.exe
    C:\Windows\system32\takeown.exe /F C:\Windows\system32\Session.exe
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:3744
- - C:\Windows\SysWOW64\icacls.exe
    C:\Windows\system32\icacls.exe C:\Windows\system32\Session.exe /reset
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:3308
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Session" & del "C:\Users\Admin\AppData\Roaming\Session"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1780
  - - C:\Windows\SysWOW64\choice.exe
      choice /t 10 /d y
      4⤵
      PID:2536
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -h "C:\Users\Admin\AppData\Roaming\Session"
      4⤵
      Views/modifies file attributes
      PID:664
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\lock.exe" & del "C:\Users\Admin\AppData\Local\Temp\lock.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1888
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:404
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Users\Admin\AppData\Local\Temp\lock.exe"
    3⤵
    - Views/modifies file attributes
    PID:244

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
- Modifies service
PID:3804

C:\Windows\SysWOW64\Session.exe
C:\Windows\SysWOW64\Session.exe -s
1⤵
- Suspicious use of WriteProcessMemory
- Executes dropped EXE
- Modifies extensions of user files
PID:1664
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Session.exe" & del "C:\Windows\SysWOW64\Session.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3684
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:2196
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Windows\SysWOW64\Session.exe"
    3⤵
    - Drops file in System32 directory
    - Views/modifies file attributes
    PID:3892

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

T1158

Modify Existing Service

T1031

Privilege Escalation

Defense Evasion

File Deletion

T1107

File and Directory Permissions Modification

T1222

Hidden Files and Directories

T1158

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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