wastedlocker | 0e061255b12ade5dc10f4ad9aeca9ebe5496d28ed251acb376c66c1d9f405821

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

Processes:

lock.exeSession:binSession.execmd.execmd.execmd.exe

description	pid	process	target process
PID 3536 wrote to memory of 3720	3536	lock.exe	Session:bin
PID 3536 wrote to memory of 3720	3536	lock.exe	Session:bin
PID 3536 wrote to memory of 3720	3536	lock.exe	Session:bin
PID 3720 wrote to memory of 3848	3720	Session:bin	vssadmin.exe
PID 3720 wrote to memory of 3848	3720	Session:bin	vssadmin.exe
PID 3720 wrote to memory of 3744	3720	Session:bin	takeown.exe
PID 3720 wrote to memory of 3744	3720	Session:bin	takeown.exe
PID 3720 wrote to memory of 3744	3720	Session:bin	takeown.exe
PID 3720 wrote to memory of 3308	3720	Session:bin	icacls.exe
PID 3720 wrote to memory of 3308	3720	Session:bin	icacls.exe
PID 3720 wrote to memory of 3308	3720	Session:bin	icacls.exe
PID 1664 wrote to memory of 3684	1664	Session.exe	cmd.exe
PID 1664 wrote to memory of 3684	1664	Session.exe	cmd.exe
PID 1664 wrote to memory of 3684	1664	Session.exe	cmd.exe
PID 3684 wrote to memory of 2196	3684	cmd.exe	choice.exe
PID 3684 wrote to memory of 2196	3684	cmd.exe	choice.exe
PID 3684 wrote to memory of 2196	3684	cmd.exe	choice.exe
PID 3720 wrote to memory of 1780	3720	Session:bin	cmd.exe
PID 3720 wrote to memory of 1780	3720	Session:bin	cmd.exe
PID 3720 wrote to memory of 1780	3720	Session:bin	cmd.exe
PID 3536 wrote to memory of 1888	3536	lock.exe	cmd.exe
PID 3536 wrote to memory of 1888	3536	lock.exe	cmd.exe
PID 3536 wrote to memory of 1888	3536	lock.exe	cmd.exe
PID 1780 wrote to memory of 2536	1780	cmd.exe	choice.exe
PID 1780 wrote to memory of 2536	1780	cmd.exe	choice.exe
PID 1780 wrote to memory of 2536	1780	cmd.exe	choice.exe
PID 1888 wrote to memory of 404	1888	cmd.exe	choice.exe
PID 1888 wrote to memory of 404	1888	cmd.exe	choice.exe
PID 1888 wrote to memory of 404	1888	cmd.exe	choice.exe
PID 3684 wrote to memory of 3892	3684	cmd.exe	attrib.exe
PID 3684 wrote to memory of 3892	3684	cmd.exe	attrib.exe
PID 3684 wrote to memory of 3892	3684	cmd.exe	attrib.exe
PID 1780 wrote to memory of 664	1780	cmd.exe	attrib.exe
PID 1780 wrote to memory of 664	1780	cmd.exe	attrib.exe
PID 1780 wrote to memory of 664	1780	cmd.exe	attrib.exe
PID 1888 wrote to memory of 244	1888	cmd.exe	attrib.exe
PID 1888 wrote to memory of 244	1888	cmd.exe	attrib.exe
PID 1888 wrote to memory of 244	1888	cmd.exe	attrib.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vssvc.exe

description pid process

Token: SeBackupPrivilege 3804 vssvc.exe
Token: SeRestorePrivilege 3804 vssvc.exe
Token: SeAuditPrivilege 3804 vssvc.exe

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

Processes:

vssvc.exe

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 Permissions Modification
T1222

Processes:

takeown.exeicacls.exe

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

pid	process
3744	takeown.exe
3308	icacls.exe

Drops file in System32 directory 2 IoCs

Processes:

Session:binattrib.exe

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

Processes:

Session:binSession.exe

pid process

3720 Session:bin
1664 Session.exe

pid	process
3720	Session:bin
1664	Session.exe

Modifies extensions of user files 18 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

Session.exe

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

Processes:

takeown.exeicacls.exe

pid process

3744 takeown.exe
3308 icacls.exe
Views/modifies file attributes 1 TTPs 3 IoCs
evasion

Hidden Files and Directories
T1158

Processes:

attrib.exeattrib.exeattrib.exe

pid process

3892 attrib.exe
664 attrib.exe
244 attrib.exe
NTFS ADS 1 IoCs

Processes:

lock.exe

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

Processes:

vssadmin.exe

pid process

3848 vssadmin.exe

pid	process
3744	takeown.exe
3308	icacls.exe

pid	process
3892	attrib.exe
664	attrib.exe
244	attrib.exe

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

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