wastedlocker | 5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

Analysis

max time kernel
126s
max time network
149s
platform
windows10_x64
resource
win10v200430
submitted
10-07-2020 12:03

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General

Target

5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe
Size

1.0MB
MD5

572fea5f025df78f2d316216fbeee52e
SHA1

91b2bf44b1f9282c09f07f16631deaa3ad9d956d
SHA256

5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367
SHA512

eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

Score

10^/10

ransomware persistence discovery wastedlocker exploit

Malware Config

Signatures

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
4080	takeown.exe
3612	icacls.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
952	vssadmin.exe

Drops file in System32 directory 2 IoCs

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

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
4080	takeown.exe
3612	icacls.exe

Views/modifies file attributes 1 TTPs 3 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
3740	attrib.exe
2668	attrib.exe
3228	attrib.exe

Executes dropped EXE 2 IoCs

pid	Process
1840	Mui:bin
3944	Mui.exe

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

File Deletion
T1107

Inhibit System Recovery
T1490

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\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
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Registry Writer	vssvc.exe

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

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Mui:bin	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 1628 wrote to memory of 1840	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	68
PID 1628 wrote to memory of 1840	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	68
PID 1628 wrote to memory of 1840	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	68
PID 1840 wrote to memory of 952	1840	Mui:bin	69
PID 1840 wrote to memory of 952	1840	Mui:bin	69
PID 1840 wrote to memory of 4080	1840	Mui:bin	73
PID 1840 wrote to memory of 4080	1840	Mui:bin	73
PID 1840 wrote to memory of 4080	1840	Mui:bin	73
PID 1840 wrote to memory of 3612	1840	Mui:bin	75
PID 1840 wrote to memory of 3612	1840	Mui:bin	75
PID 1840 wrote to memory of 3612	1840	Mui:bin	75
PID 3944 wrote to memory of 3996	3944	Mui.exe	80
PID 3944 wrote to memory of 3996	3944	Mui.exe	80
PID 3944 wrote to memory of 3996	3944	Mui.exe	80
PID 3996 wrote to memory of 3256	3996	cmd.exe	82
PID 3996 wrote to memory of 3256	3996	cmd.exe	82
PID 3996 wrote to memory of 3256	3996	cmd.exe	82
PID 1840 wrote to memory of 4064	1840	Mui:bin	83
PID 1840 wrote to memory of 4064	1840	Mui:bin	83
PID 1840 wrote to memory of 4064	1840	Mui:bin	83
PID 1628 wrote to memory of 64	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	85
PID 1628 wrote to memory of 64	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	85
PID 1628 wrote to memory of 64	1628	5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe	85
PID 4064 wrote to memory of 3644	4064	cmd.exe	87
PID 4064 wrote to memory of 3644	4064	cmd.exe	87
PID 4064 wrote to memory of 3644	4064	cmd.exe	87
PID 64 wrote to memory of 2968	64	cmd.exe	88
PID 64 wrote to memory of 2968	64	cmd.exe	88
PID 64 wrote to memory of 2968	64	cmd.exe	88
PID 3996 wrote to memory of 3740	3996	cmd.exe	92
PID 3996 wrote to memory of 3740	3996	cmd.exe	92
PID 3996 wrote to memory of 3740	3996	cmd.exe	92
PID 64 wrote to memory of 2668	64	cmd.exe	93
PID 64 wrote to memory of 2668	64	cmd.exe	93
PID 64 wrote to memory of 2668	64	cmd.exe	93
PID 4064 wrote to memory of 3228	4064	cmd.exe	94
PID 4064 wrote to memory of 3228	4064	cmd.exe	94
PID 4064 wrote to memory of 3228	4064	cmd.exe	94

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	2084	vssvc.exe
Token: SeRestorePrivilege	2084	vssvc.exe
Token: SeAuditPrivilege	2084	vssvc.exe

C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe
"C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe"
1⤵
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:1628
- C:\Users\Admin\AppData\Roaming\Mui:bin
  C:\Users\Admin\AppData\Roaming\Mui:bin -r
  2⤵
  - Drops file in System32 directory
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1840
- - C:\Windows\system32\vssadmin.exe
    C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - Interacts with shadow copies
    PID:952
- - C:\Windows\SysWOW64\takeown.exe
    C:\Windows\system32\takeown.exe /F C:\Windows\system32\Mui.exe
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:4080
- - C:\Windows\SysWOW64\icacls.exe
    C:\Windows\system32\icacls.exe C:\Windows\system32\Mui.exe /reset
    3⤵
    - Modifies file permissions
    - Possible privilege escalation attempt
    PID:3612
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Mui" & del "C:\Users\Admin\AppData\Roaming\Mui"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4064
  - - C:\Windows\SysWOW64\choice.exe
      choice /t 10 /d y
      4⤵
      PID:3644
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -h "C:\Users\Admin\AppData\Roaming\Mui"
      4⤵
      Views/modifies file attributes
      PID:3228
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe" & del "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:64
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:2968
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.exe"
    3⤵
    - Views/modifies file attributes
    PID:2668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Modifies service
- Suspicious use of AdjustPrivilegeToken
PID:2084

C:\Windows\SysWOW64\Mui.exe
C:\Windows\SysWOW64\Mui.exe -s
1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3944
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Mui.exe" & del "C:\Windows\SysWOW64\Mui.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3996
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:3256
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Windows\SysWOW64\Mui.exe"
    3⤵
    - Drops file in System32 directory
    - Views/modifies file attributes
    PID:3740

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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