dcrat | 46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761

General

Target

46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe
Size

1.1MB
MD5

bae83c597a9f76e1a42b833f108c8c9a
SHA1

c0be6ab84266d366d22b28c5bc0d68f2be525fc1
SHA256

46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761
SHA512

0b72794bc1d6ce47406a7fc4a12b1a0107633882cb06387f6abe9ef6480a93381bed71ac254e8bfdfa434b65f04419136e4ff992346f420f289075c48484715e
SSDEEP

24576:K2G/nvxW3WHKfhIVMjZs1LtHoFJS32TpfXVH:KbA3xZ0Mj6g3

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 15 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	2240	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2628	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2652	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2680	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1948	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2248	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1864	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1876	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	796	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2676	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	264	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1488	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2824	2732	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1796	2732	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016399-9.dat	dcrat
behavioral1/memory/2344-13-0x0000000000ED0000-0x0000000000FA6000-memory.dmp	dcrat
behavioral1/memory/1640-31-0x0000000000FB0000-0x0000000001086000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 2 IoCs

pid	Process
2344	blockweb.exe
1640	spoolsv.exe

Loads dropped DLL 2 IoCs

pid	Process
2912	cmd.exe
2912	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows NT\Accessories\fr-FR\dwm.exe	blockweb.exe
File created	C:\Program Files (x86)\Windows NT\Accessories\fr-FR\6cb0b6c459d5d3	blockweb.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\assembly\explorer.exe	blockweb.exe
File created	C:\Windows\Microsoft.NET\assembly\7a0fd90576e088	blockweb.exe
File created	C:\Windows\Logs\DPX\smss.exe	blockweb.exe
File opened for modification	C:\Windows\Logs\DPX\smss.exe	blockweb.exe
File created	C:\Windows\Logs\DPX\69ddcba757bf72	blockweb.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	46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.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
2164	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2676	schtasks.exe
2624	schtasks.exe
2680	schtasks.exe
2248	schtasks.exe
796	schtasks.exe
1488	schtasks.exe
1948	schtasks.exe
1864	schtasks.exe
1876	schtasks.exe
264	schtasks.exe
1796	schtasks.exe
2240	schtasks.exe
2628	schtasks.exe
2652	schtasks.exe
2824	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2344	blockweb.exe
1640	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2344	blockweb.exe
Token: SeDebugPrivilege	1640	spoolsv.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 3044 wrote to memory of 2540	3044	46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe	30
PID 3044 wrote to memory of 2540	3044	46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe	30
PID 3044 wrote to memory of 2540	3044	46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe	30
PID 3044 wrote to memory of 2540	3044	46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe	30
PID 2540 wrote to memory of 2912	2540	WScript.exe	31
PID 2540 wrote to memory of 2912	2540	WScript.exe	31
PID 2540 wrote to memory of 2912	2540	WScript.exe	31
PID 2540 wrote to memory of 2912	2540	WScript.exe	31
PID 2912 wrote to memory of 2344	2912	cmd.exe	33
PID 2912 wrote to memory of 2344	2912	cmd.exe	33
PID 2912 wrote to memory of 2344	2912	cmd.exe	33
PID 2912 wrote to memory of 2344	2912	cmd.exe	33
PID 2344 wrote to memory of 1056	2344	blockweb.exe	50
PID 2344 wrote to memory of 1056	2344	blockweb.exe	50
PID 2344 wrote to memory of 1056	2344	blockweb.exe	50
PID 2912 wrote to memory of 2164	2912	cmd.exe	52
PID 2912 wrote to memory of 2164	2912	cmd.exe	52
PID 2912 wrote to memory of 2164	2912	cmd.exe	52
PID 2912 wrote to memory of 2164	2912	cmd.exe	52
PID 1056 wrote to memory of 1584	1056	cmd.exe	53
PID 1056 wrote to memory of 1584	1056	cmd.exe	53
PID 1056 wrote to memory of 1584	1056	cmd.exe	53
PID 1056 wrote to memory of 1640	1056	cmd.exe	54
PID 1056 wrote to memory of 1640	1056	cmd.exe	54
PID 1056 wrote to memory of 1640	1056	cmd.exe	54

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\46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe
"C:\Users\Admin\AppData\Local\Temp\46f77240e4a469bf38e0600e95edf6de249ede13f5a41de3702af584a69b7761.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3044
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\ServerBrokerperf\PsCiFwPs5yLlLF7yRNDHfRA.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2540
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\ServerBrokerperf\yZmK36IDpKQLRFj1psdgPwkClrgJN.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2912
  - - C:\ServerBrokerperf\blockweb.exe
      "C:\ServerBrokerperf\blockweb.exe"
      4⤵
      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:2344
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ZdpG9cvkU5.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1056
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1584
      - C:\Users\Default\Downloads\spoolsv.exe
        
        "C:\Users\Default\Downloads\spoolsv.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1640
  - - 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:2164

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Windows\Logs\DPX\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2240

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\Logs\DPX\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Windows\Logs\DPX\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Windows\Microsoft.NET\assembly\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\Microsoft.NET\assembly\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Windows\Microsoft.NET\assembly\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows NT\Accessories\fr-FR\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\Accessories\fr-FR\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows NT\Accessories\fr-FR\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Recovery\209d6542-69f6-11ef-b491-62cb582c238c\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Users\Default\Downloads\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1488

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\Default\Downloads\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2824

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Users\Default\Downloads\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1796

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

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Downloads

C:\ServerBrokerperf\PsCiFwPs5yLlLF7yRNDHfRA.vbe

Filesize
222B

MD5
e0e59f3a0ad8f6fc6107daf9f5ea2298

SHA1
3d8c5af544fb8e00a9aef7ceb6e861d34842aa67

SHA256
7be9d4ddae790ad15f1fa1ec2f42c22becbf3c53b3f88e77f87dc2d7e86e2370

SHA512
21aab8c94d0c6c473c472eeb779810fcf7520fb6249bc6db6945fdf1d03fabc00f9889d744f9b8593cdb1c44a62c69f738d1a13a55ef2bd3b33a7ffeed333639

Download Submit
C:\ServerBrokerperf\yZmK36IDpKQLRFj1psdgPwkClrgJN.bat

Filesize
146B

MD5
73f4bc9864b7eb9026937170a277b68e

SHA1
afec9c4c687c356a4114e282e7f188454911fbe5

SHA256
65d9d5d04a37d38026be224b5b6e70941e58d62acd86d177408f7dd041e11ad4

SHA512
b63b0700313f581ef56789a811023c9b7ad63aa52d16a8322cd53c82792208b9fb4caf5f3d9118542d96c18ef47cc6aab56f84c99c62e40c1309c48b81110b03

Download Submit
C:\Users\Admin\AppData\Local\Temp\ZdpG9cvkU5.bat

Filesize
203B

MD5
5dde512d21ad18914db6ade1618d3556

SHA1
1d555288376b1c7f3f2fa4570dc36192d39734ab

SHA256
7c5f7264afe7c52b27bfe96178afd433ffd2902afd0f9ed72c49a1414913049b

SHA512
edcd9cab9f42b958cabec122ea561b14e1d6d15b4153b189509dfbfce05d294841e3b877c0b1fdb354d8ba498a6b57c6daf6f10b5c46c9de1a2dba1e7a0f489f

Download Submit
\ServerBrokerperf\blockweb.exe

Filesize
827KB

MD5
7405cb828a4d484032c1507b1780f464

SHA1
dfd41854c4ac381431516ec27d12a1535acabb3a

SHA256
53404151c9e675018976662123f67680a45b91dd533788501ba2777d0cc932ba

SHA512
1439c2204c7aea94514b5d7be5c0d9a7cc2aefc6904eceabb7c616466fd99cc79af0e99a21ca4180da2025dbc2ec8edf682e687d3074db9609d284eb965c39a3

Download Submit
memory/1640-31-0x0000000000FB0000-0x0000000001086000-memory.dmp

Filesize
856KB

Download
memory/2344-13-0x0000000000ED0000-0x0000000000FA6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads