dcrat | 76e7d1b53c84ccbf7789386bdeffc58d4171f2fbfa650891e980ccc6f77789ba

General

Target

f6ce84a3177d88fd779e990ecd08c5b3.exe
Size

1.1MB
MD5

f6ce84a3177d88fd779e990ecd08c5b3
SHA1

421a718c107138941a908abc5a5ec608f2ff1121
SHA256

76e7d1b53c84ccbf7789386bdeffc58d4171f2fbfa650891e980ccc6f77789ba
SHA512

f3a721633d9e4d5c0376ebf638e05d454ebd6f75d2cdd842e173c9dc2b1568f686a96ef4d737426dc56ffafe4e28fd56abffa29986c375834b5a4348bcde6770
SSDEEP

24576:U2G/nvxW3Ww0tqNUI8y/hByvMnRxzbL6mcYUJV2Vzl:UbA30MF/hRwfMx

Score

10^/10

dcrat discovery evasion infostealer rat

Malware Config

Signatures

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

Process spawned unexpected child process 18 IoCs

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

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2880	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2856	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2608	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2680	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3056	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1540	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2808	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2792	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	592	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2500	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1632	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1060	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2012	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1264	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2096	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2920	2028	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1336	2028	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000018d7b-9.dat	dcrat
behavioral1/memory/2712-13-0x0000000000E20000-0x0000000000EF6000-memory.dmp	dcrat
behavioral1/memory/2944-32-0x00000000013E0000-0x00000000014B6000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 2 IoCs

pid	Process
2712	agentWinmonitor.exe
2944	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
1648	cmd.exe
1648	cmd.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\DVD Maker\1610b97d3ab4a7	agentWinmonitor.exe
File created	C:\Program Files\DVD Maker\OSPPSVC.exe	agentWinmonitor.exe
File opened for modification	C:\Program Files\DVD Maker\OSPPSVC.exe	agentWinmonitor.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	f6ce84a3177d88fd779e990ecd08c5b3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
2084	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2880	schtasks.exe
2856	schtasks.exe
2792	schtasks.exe
592	schtasks.exe
2920	schtasks.exe
2680	schtasks.exe
1540	schtasks.exe
2808	schtasks.exe
2012	schtasks.exe
1060	schtasks.exe
1264	schtasks.exe
2096	schtasks.exe
2608	schtasks.exe
1816	schtasks.exe
2500	schtasks.exe
1632	schtasks.exe
3056	schtasks.exe
1336	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2712	agentWinmonitor.exe
2944	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2712	agentWinmonitor.exe
Token: SeDebugPrivilege	2944	csrss.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 2528	2156	f6ce84a3177d88fd779e990ecd08c5b3.exe	30
PID 2156 wrote to memory of 2528	2156	f6ce84a3177d88fd779e990ecd08c5b3.exe	30
PID 2156 wrote to memory of 2528	2156	f6ce84a3177d88fd779e990ecd08c5b3.exe	30
PID 2156 wrote to memory of 2528	2156	f6ce84a3177d88fd779e990ecd08c5b3.exe	30
PID 2528 wrote to memory of 1648	2528	WScript.exe	31
PID 2528 wrote to memory of 1648	2528	WScript.exe	31
PID 2528 wrote to memory of 1648	2528	WScript.exe	31
PID 2528 wrote to memory of 1648	2528	WScript.exe	31
PID 1648 wrote to memory of 2712	1648	cmd.exe	33
PID 1648 wrote to memory of 2712	1648	cmd.exe	33
PID 1648 wrote to memory of 2712	1648	cmd.exe	33
PID 1648 wrote to memory of 2712	1648	cmd.exe	33
PID 2712 wrote to memory of 2944	2712	agentWinmonitor.exe	54
PID 2712 wrote to memory of 2944	2712	agentWinmonitor.exe	54
PID 2712 wrote to memory of 2944	2712	agentWinmonitor.exe	54
PID 1648 wrote to memory of 2084	1648	cmd.exe	55
PID 1648 wrote to memory of 2084	1648	cmd.exe	55
PID 1648 wrote to memory of 2084	1648	cmd.exe	55
PID 1648 wrote to memory of 2084	1648	cmd.exe	55

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\f6ce84a3177d88fd779e990ecd08c5b3.exe
"C:\Users\Admin\AppData\Local\Temp\f6ce84a3177d88fd779e990ecd08c5b3.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2156
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Serverwin\EW0p41ez0N7HYRg6N6rv6D.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2528
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Serverwin\XWK21vbuz3pBmIIr863tMg.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1648
  - - C:\Serverwin\agentWinmonitor.exe
      "C:\Serverwin\agentWinmonitor.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2712
    - - C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\csrss.exe
        
        "C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2944
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:2084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 12 /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 6 /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\Serverwin\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Serverwin\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 11 /tr "'C:\Serverwin\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 10 /tr "'C:\Serverwin\OSPPSVC.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Serverwin\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 14 /tr "'C:\Serverwin\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2500

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 6 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Serverwin\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Serverwin\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Serverwin\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2096

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1336

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Serverwin\EW0p41ez0N7HYRg6N6rv6D.vbe

Filesize
209B

MD5
541275260b9ec67c8537c0edad28f1b9

SHA1
9af23fbfc493604daaccd331efec05ebfc1e64e5

SHA256
a32684fc6fdea338d4c29bd0cac3e4dca8afb3f896a009096272cb8a32b3a51e

SHA512
47dae81d53a7c1b091eb5cab7d627811fbd7319709f7c22b4e50b628beeb269f3de36f77c7206873b1eea43ef7c665c579230f17ccfd4ca32807d2d65c1c1384

Download Submit
C:\Serverwin\XWK21vbuz3pBmIIr863tMg.bat

Filesize
146B

MD5
911702a577938eef8bbc1ce89e6d1bc8

SHA1
d7470178892e21f9c5fbc58876bda7ce5741f924

SHA256
96f145902bda9186af668c933108ce68dc3d8bba717823cade826dfde518d1bf

SHA512
683aeb4f6efb24501e64ca3cbf2734a65dd1fe9672787e472ba04304cff7698c295bdf22f59bdc62295bea5dab3d0f3ae8a6cbdd6fd70daaf6e797405173b274

Download Submit
\Serverwin\agentWinmonitor.exe

Filesize
828KB

MD5
51c9ce115354b8ac4e71e8da3f224ff4

SHA1
71b3ce67ad3d5467e58971a3ec197d4a725669bd

SHA256
e4a087a2892f543978031a40e332b829763a7a71b7d641e87fbd137958648e2d

SHA512
7636e523a8e7938dddfab02c96a5296e4ce337ebcc5d7595ea711429eae1330db46c22d9a4352c524c2b2d099ac2f27d7d96768a577a39e82a654ac980657406

Download Submit
memory/2712-13-0x0000000000E20000-0x0000000000EF6000-memory.dmp

Filesize
856KB

Download
memory/2944-32-0x00000000013E0000-0x00000000014B6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads