wastedlocker | bcdac1a2b67e2b47f8129814dca3bcf7d55404757eb09f1c3103f57da3153ec8

Analysis

max time kernel
65s
max time network
67s
platform
windows10_x64
resource
win10v200722
submitted
05/08/2020, 20:57

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General

Target
BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe
Size 60KB
Sample200805-9bpdqlf32e
SHA256 bcdac1a2b67e2b47f8129814dca3bcf7d55404757eb09f1c3103f57da3153ec8
MD5 0ed2ca539a01cdb86c88a9a1604b2005
SHA1 4fed7eae00bfa21938e49f33b7c6794fd7d0750c
SHA512 34dad101cd7c5f9ff2267674d224986b9274e0e17d9ae665ca1af4ffa57408106238b1e248045465ab17c72a4b92473ab3714aefb705d95f9725a4251379c7e2
MD5 SHA1 SHA512

Score

10^/10

persistence ransomware wastedlocker discovery exploit

Malware Config

Signatures

Views/modifies file attributes 1 TTPs 3 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
3080	attrib.exe
4008	attrib.exe
3964	attrib.exe

Drops file in System32 directory 2 IoCs

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

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
1696	takeown.exe
1948	icacls.exe

NTFS ADS 1 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Extension:bin	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.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
608	vssadmin.exe

Modifies extensions of user files 12 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File opened for modification	C:\Users\Admin\Pictures\ReceiveWait.crw.bbawasted	Extension.exe
File created	C:\Users\Admin\Pictures\ConvertFromConvertTo.png.bbawasted_info	Extension.exe
File opened for modification	C:\Users\Admin\Pictures\ConvertFromConvertTo.png.bbawasted	Extension.exe
File created	C:\Users\Admin\Pictures\MoveOpen.tif.bbawasted_info	Extension.exe
File renamed	C:\Users\Admin\Pictures\MoveOpen.tif => C:\Users\Admin\Pictures\MoveOpen.tif.bbawasted	Extension.exe
File opened for modification	C:\Users\Admin\Pictures\MoveOpen.tif.bbawasted	Extension.exe
File renamed	C:\Users\Admin\Pictures\ReceiveWait.crw => C:\Users\Admin\Pictures\ReceiveWait.crw.bbawasted	Extension.exe
File renamed	C:\Users\Admin\Pictures\ConvertFromConvertTo.png => C:\Users\Admin\Pictures\ConvertFromConvertTo.png.bbawasted	Extension.exe
File created	C:\Users\Admin\Pictures\MergeCompress.raw.bbawasted_info	Extension.exe
File renamed	C:\Users\Admin\Pictures\MergeCompress.raw => C:\Users\Admin\Pictures\MergeCompress.raw.bbawasted	Extension.exe
File opened for modification	C:\Users\Admin\Pictures\MergeCompress.raw.bbawasted	Extension.exe
File created	C:\Users\Admin\Pictures\ReceiveWait.crw.bbawasted_info	Extension.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\SwProvider_{b5946137-7b9f-4925-af80-51abd60b20d5}	vssvc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VSS\Diag\Registry Writer	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

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

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1696	takeown.exe
1948	icacls.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 728 wrote to memory of 848	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	67
PID 728 wrote to memory of 848	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	67
PID 728 wrote to memory of 848	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	67
PID 848 wrote to memory of 608	848	Extension:bin	68
PID 848 wrote to memory of 608	848	Extension:bin	68
PID 848 wrote to memory of 1696	848	Extension:bin	72
PID 848 wrote to memory of 1696	848	Extension:bin	72
PID 848 wrote to memory of 1696	848	Extension:bin	72
PID 848 wrote to memory of 1948	848	Extension:bin	74
PID 848 wrote to memory of 1948	848	Extension:bin	74
PID 848 wrote to memory of 1948	848	Extension:bin	74
PID 2224 wrote to memory of 2688	2224	Extension.exe	78
PID 2224 wrote to memory of 2688	2224	Extension.exe	78
PID 2224 wrote to memory of 2688	2224	Extension.exe	78
PID 2688 wrote to memory of 2976	2688	cmd.exe	80
PID 2688 wrote to memory of 2976	2688	cmd.exe	80
PID 2688 wrote to memory of 2976	2688	cmd.exe	80
PID 848 wrote to memory of 3416	848	Extension:bin	81
PID 848 wrote to memory of 3416	848	Extension:bin	81
PID 848 wrote to memory of 3416	848	Extension:bin	81
PID 728 wrote to memory of 3832	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	83
PID 728 wrote to memory of 3832	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	83
PID 728 wrote to memory of 3832	728	BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe	83
PID 3416 wrote to memory of 3952	3416	cmd.exe	85
PID 3416 wrote to memory of 3952	3416	cmd.exe	85
PID 3416 wrote to memory of 3952	3416	cmd.exe	85
PID 3832 wrote to memory of 3656	3832	cmd.exe	86
PID 3832 wrote to memory of 3656	3832	cmd.exe	86
PID 3832 wrote to memory of 3656	3832	cmd.exe	86
PID 2688 wrote to memory of 4008	2688	cmd.exe	87
PID 2688 wrote to memory of 4008	2688	cmd.exe	87
PID 2688 wrote to memory of 4008	2688	cmd.exe	87
PID 3416 wrote to memory of 3964	3416	cmd.exe	88
PID 3416 wrote to memory of 3964	3416	cmd.exe	88
PID 3416 wrote to memory of 3964	3416	cmd.exe	88
PID 3832 wrote to memory of 3080	3832	cmd.exe	89
PID 3832 wrote to memory of 3080	3832	cmd.exe	89
PID 3832 wrote to memory of 3080	3832	cmd.exe	89

Executes dropped EXE 2 IoCs

pid	Process
848	Extension:bin
2224	Extension.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeBackupPrivilege	1232	vssvc.exe
Token: SeRestorePrivilege	1232	vssvc.exe
Token: SeAuditPrivilege	1232	vssvc.exe

C:\Users\Admin\AppData\Local\Temp\BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe
"C:\Users\Admin\AppData\Local\Temp\BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe"
1⤵
- NTFS ADS
- Suspicious use of WriteProcessMemory
PID:728
- C:\Users\Admin\AppData\Roaming\Extension:bin
  C:\Users\Admin\AppData\Roaming\Extension:bin -r
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  - Executes dropped EXE
  PID:848
- - C:\Windows\system32\vssadmin.exe
    C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
    3⤵
    - Interacts with shadow copies
    PID:608
- - C:\Windows\SysWOW64\takeown.exe
    C:\Windows\system32\takeown.exe /F C:\Windows\system32\Extension.exe
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1696
- - C:\Windows\SysWOW64\icacls.exe
    C:\Windows\system32\icacls.exe C:\Windows\system32\Extension.exe /reset
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1948
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Extension" & del "C:\Users\Admin\AppData\Roaming\Extension"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3416
  - - C:\Windows\SysWOW64\choice.exe
      choice /t 10 /d y
      4⤵
      PID:3952
  - - C:\Windows\SysWOW64\attrib.exe
      attrib -h "C:\Users\Admin\AppData\Roaming\Extension"
      4⤵
      Views/modifies file attributes
      PID:3964
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe" & del "C:\Users\Admin\AppData\Local\Temp\BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3832
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:3656
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Users\Admin\AppData\Local\Temp\BCDAC1A2B67E2B47F8129814DCA3BCF7D55404757EB09F1C3103F57DA3153EC8.exe"
    3⤵
    - Views/modifies file attributes
    PID:3080

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Modifies service
- Suspicious use of AdjustPrivilegeToken
PID:1232

C:\Windows\SysWOW64\Extension.exe
C:\Windows\SysWOW64\Extension.exe -s
1⤵
- Modifies extensions of user files
- Suspicious use of WriteProcessMemory
- Executes dropped EXE
PID:2224
- C:\Windows\SysWOW64\cmd.exe
  cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Extension.exe" & del "C:\Windows\SysWOW64\Extension.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2688
- - C:\Windows\SysWOW64\choice.exe
    choice /t 10 /d y
    3⤵
    PID:2976
- - C:\Windows\SysWOW64\attrib.exe
    attrib -h "C:\Windows\SysWOW64\Extension.exe"
    3⤵
    - Views/modifies file attributes
    - Drops file in System32 directory
    PID:4008

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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