dcrat | 1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f

General

Target

1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe
Size

608KB
MD5

63144ff5a65e776313c9cb44da25a200
SHA1

31e41d70fc55af771446bf4f879afbd809b6a7df
SHA256

1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f
SHA512

a32bbcb9b8799fc542cb1b0a5a1b6fceec3471d996fdeae965aa2a3860914fdaa4a64725f02221959d0a0a26fc13d8f23edf392baca4e04f34d0d2e6054c52cb
SSDEEP

12288:jpoIY///1UFAe3kB0xazM6WZuS20IFpdO4WrzJjPt4mFBYU:CIY/YSQOjWZuWI84uJjhBY

Score

10^/10

dcrat discovery 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

Process spawned unexpected child process 24 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	2920	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3036	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1992	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1552	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2352	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2448	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1880	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	844	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2276	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1804	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2872	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1760	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	332	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	600	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2176	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2208	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2376	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2108	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2948	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2168	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1172	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2204	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2148	2876	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2652	2876	schtasks.exe	35

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x000b00000001227f-6.dat	dcrat
behavioral1/files/0x0006000000018716-20.dat	dcrat
behavioral1/memory/2676-24-0x0000000000330000-0x0000000000406000-memory.dmp	dcrat
behavioral1/memory/1392-47-0x00000000003B0000-0x0000000000486000-memory.dmp	dcrat

Executes dropped EXE 3 IoCs

pid	Process
2804	Nursultan alpha.exe
2676	reviewbroker.exe
1392	explorer.exe

Loads dropped DLL 2 IoCs

pid	Process
2584	cmd.exe
2584	cmd.exe

Drops file in Program Files directory 7 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Photo Viewer\1610b97d3ab4a7	reviewbroker.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\System.exe	reviewbroker.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\27d1bcfc3c54e0	reviewbroker.exe
File created	C:\Program Files (x86)\Uninstall Information\services.exe	reviewbroker.exe
File created	C:\Program Files (x86)\Uninstall Information\c5b4cb5e9653cc	reviewbroker.exe
File created	C:\Program Files\Windows Photo Viewer\OSPPSVC.exe	reviewbroker.exe
File opened for modification	C:\Program Files\Windows Photo Viewer\OSPPSVC.exe	reviewbroker.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Prefetch\ReadyBoot\sppsvc.exe	reviewbroker.exe
File created	C:\Windows\Prefetch\ReadyBoot\0a1fd5f707cd16	reviewbroker.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 3 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	Nursultan alpha.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3036	schtasks.exe
844	schtasks.exe
2872	schtasks.exe
600	schtasks.exe
2148	schtasks.exe
2448	schtasks.exe
1880	schtasks.exe
1760	schtasks.exe
2376	schtasks.exe
2108	schtasks.exe
1992	schtasks.exe
2948	schtasks.exe
1172	schtasks.exe
2204	schtasks.exe
2208	schtasks.exe
2920	schtasks.exe
1552	schtasks.exe
2352	schtasks.exe
2276	schtasks.exe
1804	schtasks.exe
332	schtasks.exe
2176	schtasks.exe
2168	schtasks.exe
2652	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2676	reviewbroker.exe
2676	reviewbroker.exe
2676	reviewbroker.exe
1392	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2676	reviewbroker.exe
Token: SeDebugPrivilege	1392	explorer.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 2804	2648	1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe	30
PID 2648 wrote to memory of 2804	2648	1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe	30
PID 2648 wrote to memory of 2804	2648	1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe	30
PID 2648 wrote to memory of 2804	2648	1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe	30
PID 2804 wrote to memory of 2588	2804	Nursultan alpha.exe	31
PID 2804 wrote to memory of 2588	2804	Nursultan alpha.exe	31
PID 2804 wrote to memory of 2588	2804	Nursultan alpha.exe	31
PID 2804 wrote to memory of 2588	2804	Nursultan alpha.exe	31
PID 2588 wrote to memory of 2584	2588	WScript.exe	32
PID 2588 wrote to memory of 2584	2588	WScript.exe	32
PID 2588 wrote to memory of 2584	2588	WScript.exe	32
PID 2588 wrote to memory of 2584	2588	WScript.exe	32
PID 2584 wrote to memory of 2676	2584	cmd.exe	34
PID 2584 wrote to memory of 2676	2584	cmd.exe	34
PID 2584 wrote to memory of 2676	2584	cmd.exe	34
PID 2584 wrote to memory of 2676	2584	cmd.exe	34
PID 2676 wrote to memory of 1392	2676	reviewbroker.exe	60
PID 2676 wrote to memory of 1392	2676	reviewbroker.exe	60
PID 2676 wrote to memory of 1392	2676	reviewbroker.exe	60

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\1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe
"C:\Users\Admin\AppData\Local\Temp\1b9e9cca2dcab6f35d56f397ad17aaf66dbdb7984834b9f8c26f094a2f0f763f.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2648
- C:\Users\Admin\AppData\Local\Temp\Nursultan alpha.exe
  "C:\Users\Admin\AppData\Local\Temp\Nursultan alpha.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2804
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Blockcontainernet\W43Bcik1fetwz8mb03Kl4Wsl.vbe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2588
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Blockcontainernet\AR9N8DWDPuNq5i9PvFB6SJq5vZat0J.bat" "
      4⤵
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2584
    - - C:\Blockcontainernet\reviewbroker.exe
        
        "C:\Blockcontainernet\reviewbroker.exe"
        5⤵
        Executes dropped EXE
        Drops file in Program Files directory
        Drops file in Windows directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2676
      - C:\Users\Default User\explorer.exe
        
        "C:\Users\Default User\explorer.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Photo Viewer\OSPPSVC.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Photo Viewer\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft Sync Framework\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Sync Framework\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft Sync Framework\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 12 /tr "'C:\Windows\Prefetch\ReadyBoot\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\Prefetch\ReadyBoot\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\Windows\Prefetch\ReadyBoot\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1804

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\Default User\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Recovery\2d53f482-3d8b-11ef-b05d-f2a3cf4ad94f\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\2d53f482-3d8b-11ef-b05d-f2a3cf4ad94f\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 12 /tr "'C:\Recovery\2d53f482-3d8b-11ef-b05d-f2a3cf4ad94f\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Uninstall Information\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2208

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files (x86)\Uninstall Information\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2376

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Uninstall Information\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2108

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 10 /tr "'C:\Users\Public\Pictures\Sample Pictures\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Users\Public\Pictures\Sample Pictures\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 14 /tr "'C:\Users\Public\Pictures\Sample Pictures\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1172

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Package Cache\{F6080405-9FA8-4CAA-9982-14E95D1A3DAC}v14.30.30704\packages\vcRuntimeMinimum_x86\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Users\All Users\Package Cache\{F6080405-9FA8-4CAA-9982-14E95D1A3DAC}v14.30.30704\packages\vcRuntimeMinimum_x86\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Package Cache\{F6080405-9FA8-4CAA-9982-14E95D1A3DAC}v14.30.30704\packages\vcRuntimeMinimum_x86\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2652

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

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

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Downloads

C:\Blockcontainernet\AR9N8DWDPuNq5i9PvFB6SJq5vZat0J.bat

Filesize
39B

MD5
5d93d13cd1a016e3f5f76b5b67ce7b35

SHA1
f2b28b545989d846663f23febdcb80383264f248

SHA256
fa28c368016672804e3d1efbd51cbbd0147af38960f9d60731da9fbeb61d6439

SHA512
61bebca915e256db05f08bdf4847a01e682eb594fca5cf180a8f596325f14962e6e869ecc6bb0d0c64b7c441bf03795025781b7c92c503c9414767015c4302bc

Download Submit
C:\Blockcontainernet\W43Bcik1fetwz8mb03Kl4Wsl.vbe

Filesize
224B

MD5
3981990d1923b76df9db376e9d2cbbc5

SHA1
a07ce24994557da63deefb8a7db94054235c1993

SHA256
459538eb075aad8ac5fda45baabedbf7889ed2162feed9011efcb9490cff89f1

SHA512
b80bbdfd2e21ae5cd64e97d6841e769e7e3500d1eb17f4f76ca6a1f74e7d8cabc16ebfae12495e6dca4d488da5e9e0d82830813a20038231d2ae704604f04899

Download Submit
C:\Users\Admin\AppData\Local\Temp\Nursultan alpha.exe

Filesize
1.1MB

MD5
e2a02eaf1de2c2750f025172adec7b3f

SHA1
346ccaed629d5f90f59673e4dd8bfc455e4648d2

SHA256
e2ceba1c620fa9167b68e137d00c94f7b19b9dc9ab23e2e0d99c7e537482add3

SHA512
587454f4190d91599351f490a1c9514a20b993a3da825550ea58030137d92c84a912aa51586877263e7cd85ce7a7b35fb4e15cb987f56ae21b0e866c830f363b

Download Submit
\Blockcontainernet\reviewbroker.exe

Filesize
829KB

MD5
ebec19ac8397c7016e1ca22f9f5eaf69

SHA1
e153837afcf24bb8a5790751fc2d4661c751f8ad

SHA256
d3fc1234ce59c9e43749ce9ce14e212512f9e85267aee52a569ee78e51d68c17

SHA512
a73065178db0117f4664de676307823ab72ea0c62ca427af12338f83a7497b6ca92b404a9df7fb81188461b43bd711e41f62d4d9e65a7f1abfd99a648ca0045c

Download Submit
memory/1392-47-0x00000000003B0000-0x0000000000486000-memory.dmp

Filesize
856KB

Download
memory/2648-0-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/2648-1-0x0000000000F90000-0x000000000102E000-memory.dmp

Filesize
632KB

Download
memory/2648-9-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2648-48-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2676-24-0x0000000000330000-0x0000000000406000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads