wastedlocker | 85f391ecd480711401f6da2f371156f995dd5cff7580f37791e79e62b91fd9eb

Analysis

max time kernel
138s
max time network
51s
platform
windows10_x64
resource
win10v200430
submitted
04/07/2020, 03:56

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General

Target

gstabl72.exe
Size

848KB
MD5

3208a14c9bad334e331febe00f1e9734
SHA1

809fbd450e1a484a5af4ec05c345b2a7072723e7
SHA256

85f391ecd480711401f6da2f371156f995dd5cff7580f37791e79e62b91fd9eb
SHA512

b1460826b0a15e9cf752f001426ae6c9fffe96d01d7ab2802d0843b2c51f3dc1590c9c1f80e26ed9a751e7ac59f584fde4cb937841d5b4ea51a1883302da4029

Score

10^/10

ransomware wastedlocker persistence discovery exploit

Malware Config

Signatures

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Installers:bin	gstabl72.exe

WastedLocker
Ransomware family seen in the wild since May 2020.
ransomware wastedlocker

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
2680	takeown.exe
3720	icacls.exe

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
2680	takeown.exe
3720	icacls.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 992 wrote to memory of 1796	992	gstabl72.exe	67
PID 992 wrote to memory of 1796	992	gstabl72.exe	67
PID 992 wrote to memory of 1796	992	gstabl72.exe	67
PID 1796 wrote to memory of 1808	1796	Installers:bin	70
PID 1796 wrote to memory of 1808	1796	Installers:bin	70
PID 1796 wrote to memory of 2680	1796	Installers:bin	74
PID 1796 wrote to memory of 2680	1796	Installers:bin	74
PID 1796 wrote to memory of 2680	1796	Installers:bin	74
PID 1796 wrote to memory of 3720	1796	Installers:bin	76
PID 1796 wrote to memory of 3720	1796	Installers:bin	76
PID 1796 wrote to memory of 3720	1796	Installers:bin	76
PID 4064 wrote to memory of 1732	4064	Installers.exe	80
PID 4064 wrote to memory of 1732	4064	Installers.exe	80
PID 4064 wrote to memory of 1732	4064	Installers.exe	80
PID 1732 wrote to memory of 2988	1732	cmd.exe	82
PID 1732 wrote to memory of 2988	1732	cmd.exe	82
PID 1732 wrote to memory of 2988	1732	cmd.exe	82
PID 1796 wrote to memory of 3520	1796	Installers:bin	83
PID 1796 wrote to memory of 3520	1796	Installers:bin	83
PID 1796 wrote to memory of 3520	1796	Installers:bin	83
PID 992 wrote to memory of 3740	992	gstabl72.exe	85
PID 992 wrote to memory of 3740	992	gstabl72.exe	85
PID 992 wrote to memory of 3740	992	gstabl72.exe	85
PID 3520 wrote to memory of 3616	3520	cmd.exe	87
PID 3520 wrote to memory of 3616	3520	cmd.exe	87
PID 3520 wrote to memory of 3616	3520	cmd.exe	87
PID 3740 wrote to memory of 1916	3740	cmd.exe	88
PID 3740 wrote to memory of 1916	3740	cmd.exe	88
PID 3740 wrote to memory of 1916	3740	cmd.exe	88
PID 1732 wrote to memory of 796	1732	cmd.exe	90
PID 1732 wrote to memory of 796	1732	cmd.exe	90
PID 1732 wrote to memory of 796	1732	cmd.exe	90
PID 3520 wrote to memory of 2040	3520	cmd.exe	91
PID 3520 wrote to memory of 2040	3520	cmd.exe	91
PID 3520 wrote to memory of 2040	3520	cmd.exe	91
PID 3740 wrote to memory of 4004	3740	cmd.exe	92
PID 3740 wrote to memory of 4004	3740	cmd.exe	92
PID 3740 wrote to memory of 4004	3740	cmd.exe	92

Executes dropped EXE 2 IoCs

pid	Process
1796	Installers:bin
4064	Installers.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
1808	vssadmin.exe

Drops file in System32 directory 2 IoCs

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

Views/modifies file attributes 1 TTPs 3 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
4004	attrib.exe
796	attrib.exe
2040	attrib.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	1632	vssvc.exe
Token: SeRestorePrivilege	1632	vssvc.exe
Token: SeAuditPrivilege	1632	vssvc.exe

Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

C:\Users\Admin\AppData\Local\Temp\gstabl72.exe
"C:\Users\Admin\AppData\Local\Temp\gstabl72.exe"
1⤵
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:992
- C:\Users\Admin\AppData\Roaming\Installers:bin
  C:\Users\Admin\AppData\Roaming\Installers:bin -r
  2⤵
  - Suspicious use of WriteProcessMemory
  - Executes dropped EXE
  - Drops file in System32 directory
  PID:1796
- - C:\Windows\system32\vssadmin.exe
    C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - Interacts with shadow copies
    PID:1808
- - C:\Windows\SysWOW64\takeown.exe
    C:\Windows\system32\takeown.exe /F C:\Windows\system32\Installers.exe
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:2680
- - C:\Windows\SysWOW64\icacls.exe
    C:\Windows\system32\icacls.exe C:\Windows\system32\Installers.exe /reset
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:3720
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Installers" & del "C:\Users\Admin\AppData\Roaming\Installers"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3520
  - - C:\Windows\SysWOW64\choice.exe
      choice /t 10 /d y
      4⤵
      PID:3616
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -h "C:\Users\Admin\AppData\Roaming\Installers"
      4⤵
      Views/modifies file attributes
      PID:2040
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\gstabl72.exe" & del "C:\Users\Admin\AppData\Local\Temp\gstabl72.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3740
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:1916
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Users\Admin\AppData\Local\Temp\gstabl72.exe"
    3⤵
    - Views/modifies file attributes
    PID:4004

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Modifies service
- Suspicious use of AdjustPrivilegeToken
PID:1632

C:\Windows\SysWOW64\Installers.exe
C:\Windows\SysWOW64\Installers.exe -s
1⤵
- Suspicious use of WriteProcessMemory
- Executes dropped EXE
PID:4064
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Installers.exe" & del "C:\Windows\SysWOW64\Installers.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1732
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:2988
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Windows\SysWOW64\Installers.exe"
    3⤵
    - Drops file in System32 directory
    - Views/modifies file attributes
    PID:796

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

Windows 7 deprecation

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads