dcrat | 48a5d085cf6540b1dc286bbaa17141d6c40d3aa37a6a92c6326873ca98f25e8a

General

Target

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Size

1.1MB
MD5

89eafa0c3e68136ae780afb0bed528be
SHA1

8c80cb2d82eabc6a9d6bc582c0a4c67b4bc79bc3
SHA256

48a5d085cf6540b1dc286bbaa17141d6c40d3aa37a6a92c6326873ca98f25e8a
SHA512

e6a5a6a0602b3bb51235fee1a0a39a32327a62892635e1df7c0bc3135089718bac96ad878dabd6c8d35738a3a6595dabde716b6ebb78d17b75188b98de159e34
SSDEEP

12288:o8R51UropgKt6ljehIYulIB68SzlPqGlWVKZuMM2nwLjwkidihD9+HgMVeQqn4:X1UMb6ljehI7+6X+/WpHgeeQ+4

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

Process spawned unexpected child process 11 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	320	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1148	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	616	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	112	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1076	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1712	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1864	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1608	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1328	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1612	456	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1088	456	schtasks.exe

DCRat payload 6 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/1268-54-0x0000000000C30000-0x0000000000D4A000-memory.dmp	dcrat
C:\Windows\System32\wow64\smss.exe	dcrat
C:\Windows\Ultimate\explorer.exe	dcrat
C:\Windows\Ultimate\explorer.exe	dcrat
behavioral1/memory/1784-86-0x0000000000120000-0x000000000023A000-memory.dmp	dcrat
behavioral1/memory/1784-87-0x000000001AF10000-0x000000001AF90000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

explorer.exe

pid process

1784 explorer.exe

pid	process
1784	explorer.exe

Adds Run key to start application 2 TTPs 11 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeHEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\cmdl32\\taskhost.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\ProgramData\\Microsoft\\lsm.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\wow64\\smss.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\ProgramData\\Start Menu\\lsm.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\NlsData0019\\taskhost.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\RpcPing\\csrss.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\dmvdsitf\\lsm.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\imagehlp\\lsass.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\Ultimate\\explorer.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\wbiosrvc\\taskhost.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\iasrecst\\lsm.exe\""	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

Drops file in System32 directory 18 IoCs

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeHEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

description	ioc	process
File opened for modification	C:\Windows\System32\cmdl32\taskhost.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\dmvdsitf\lsm.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\NlsData0019\taskhost.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\iasrecst\101b941d020240259ca4912829b53995ad543df6	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\cmdl32\b75386f1303e64d8139363b71e44ac16341adf4e	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\NlsData0019\b75386f1303e64d8139363b71e44ac16341adf4e	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\imagehlp\lsass.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File opened for modification	C:\Windows\System32\imagehlp\lsass.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\iasrecst\lsm.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\RpcPing\csrss.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\RpcPing\886983d96e3d3e31032c679b2d4ea91b6c05afef	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\dmvdsitf\101b941d020240259ca4912829b53995ad543df6	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\wow64\69ddcba757bf72f7d36c464c71f42baab150b2b9	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\wbiosrvc\b75386f1303e64d8139363b71e44ac16341adf4e	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\cmdl32\taskhost.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\wow64\smss.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\imagehlp\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\System32\wbiosrvc\taskhost.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

Drops file in Windows directory 2 IoCs

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

description	ioc	process
File created	C:\Windows\Ultimate\explorer.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
File created	C:\Windows\Ultimate\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 11 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
1864	schtasks.exe
1608	schtasks.exe
1328	schtasks.exe
1088	schtasks.exe
320	schtasks.exe
616	schtasks.exe
112	schtasks.exe
1076	schtasks.exe
1712	schtasks.exe
1612	schtasks.exe
1148	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeHEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeexplorer.exe

pid process

1268 HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
1792 HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
1784 explorer.exe

pid	process
1268	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
1792	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
1784	explorer.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeHEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeexplorer.exe

description	pid	process
Token: SeDebugPrivilege	1268	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Token: SeDebugPrivilege	1792	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
Token: SeDebugPrivilege	1784	explorer.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exeHEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.execmd.exe

description	pid	process	target process
PID 1268 wrote to memory of 1792	1268	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
PID 1268 wrote to memory of 1792	1268	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
PID 1268 wrote to memory of 1792	1268	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
PID 1792 wrote to memory of 1568	1792	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	cmd.exe
PID 1792 wrote to memory of 1568	1792	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	cmd.exe
PID 1792 wrote to memory of 1568	1792	HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe	cmd.exe
PID 1568 wrote to memory of 1140	1568	cmd.exe	chcp.com
PID 1568 wrote to memory of 1140	1568	cmd.exe	chcp.com
PID 1568 wrote to memory of 1140	1568	cmd.exe	chcp.com
PID 1568 wrote to memory of 1464	1568	cmd.exe	w32tm.exe
PID 1568 wrote to memory of 1464	1568	cmd.exe	w32tm.exe
PID 1568 wrote to memory of 1464	1568	cmd.exe	w32tm.exe
PID 1568 wrote to memory of 1784	1568	cmd.exe	explorer.exe
PID 1568 wrote to memory of 1784	1568	cmd.exe	explorer.exe
PID 1568 wrote to memory of 1784	1568	cmd.exe	explorer.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
"C:\Users\Admin\AppData\Local\Temp\HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1268
- C:\Users\Admin\AppData\Local\Temp\HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe
  "C:\Users\Admin\AppData\Local\Temp\HEUR-Backdoor.MSIL.LightStone.gen-48a5d085cf6.exe"
  2⤵
  - Adds Run key to start application
  - Drops file in System32 directory
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1792
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\nxTpCUX1s5.bat"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1568
  - - C:\Windows\system32\chcp.com
      chcp 65001
      4⤵
      PID:1140
  - - C:\Windows\system32\w32tm.exe
      w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
      4⤵
      PID:1464
  - - C:\Windows\Ultimate\explorer.exe
      "C:\Windows\Ultimate\explorer.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\cmdl32\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\RpcPing\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\dmvdsitf\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\ProgramData\Microsoft\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\wow64\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1076

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\imagehlp\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\ProgramData\Start Menu\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\Ultimate\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\wbiosrvc\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\NlsData0019\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\iasrecst\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1088

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nxTpCUX1s5.bat

Filesize
208B

MD5
2552aa10940419b50db2d90b473785fd

SHA1
098eac8649d4e19448d40f44c6bad5af9eb16940

SHA256
09a4e92119334acf5a0af6504f316582ba309e992703587a7d9de43afcca0bfe

SHA512
8c0d51185cc919d0ec3257c40b6392d609103d02855e33a082c44fe44a29b4ab9666efbe093f2174775f6ef16566b07615fbe1cb17a3709dda08f326435891b6

Download Submit
C:\Windows\System32\wow64\smss.exe

Filesize
1.1MB

MD5
89eafa0c3e68136ae780afb0bed528be

SHA1
8c80cb2d82eabc6a9d6bc582c0a4c67b4bc79bc3

SHA256
48a5d085cf6540b1dc286bbaa17141d6c40d3aa37a6a92c6326873ca98f25e8a

SHA512
e6a5a6a0602b3bb51235fee1a0a39a32327a62892635e1df7c0bc3135089718bac96ad878dabd6c8d35738a3a6595dabde716b6ebb78d17b75188b98de159e34

Download Submit
C:\Windows\Ultimate\explorer.exe

Filesize
1.1MB

MD5
89eafa0c3e68136ae780afb0bed528be

SHA1
8c80cb2d82eabc6a9d6bc582c0a4c67b4bc79bc3

SHA256
48a5d085cf6540b1dc286bbaa17141d6c40d3aa37a6a92c6326873ca98f25e8a

SHA512
e6a5a6a0602b3bb51235fee1a0a39a32327a62892635e1df7c0bc3135089718bac96ad878dabd6c8d35738a3a6595dabde716b6ebb78d17b75188b98de159e34

Download Submit
C:\Windows\Ultimate\explorer.exe

Filesize
1.1MB

MD5
89eafa0c3e68136ae780afb0bed528be

SHA1
8c80cb2d82eabc6a9d6bc582c0a4c67b4bc79bc3

SHA256
48a5d085cf6540b1dc286bbaa17141d6c40d3aa37a6a92c6326873ca98f25e8a

SHA512
e6a5a6a0602b3bb51235fee1a0a39a32327a62892635e1df7c0bc3135089718bac96ad878dabd6c8d35738a3a6595dabde716b6ebb78d17b75188b98de159e34

Download Submit
memory/1268-54-0x0000000000C30000-0x0000000000D4A000-memory.dmp

Filesize
1.1MB

Download
memory/1268-55-0x000000001B010000-0x000000001B090000-memory.dmp

Filesize
512KB

Download
memory/1784-86-0x0000000000120000-0x000000000023A000-memory.dmp

Filesize
1.1MB

Download
memory/1784-87-0x000000001AF10000-0x000000001AF90000-memory.dmp

Filesize
512KB

Download
memory/1792-66-0x000000001AAB0000-0x000000001AB30000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads