dcrat | 534190cdacfd4dd6d00505481ff5051320f6168e3740dafbc132a5003146c3bb

General

Target

3dce7fce69c35c15988ad7bc647d4681.exe
Size

2.7MB
MD5

3dce7fce69c35c15988ad7bc647d4681
SHA1

bf0b951d922c6e92e40cec56f641a0c48da49b57
SHA256

534190cdacfd4dd6d00505481ff5051320f6168e3740dafbc132a5003146c3bb
SHA512

99e11b00a61b901a0954dbdd6c1b533c2898662584ea296fd1a92b790ffe10690cf2acba4b595e9d517fc3088ec03450c1d1ee1ce9ae8cfe1a15f24ae14ad33e
SSDEEP

49152:Ano0OKQIQaPECv3la9Bc0JpOkFl5B9LzYSbqtR6v:hMvlyG0JpOG50SbOg

Score

10^/10

dcrat defense_evasion infostealer rat trojan

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 12 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	780	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3888	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2304	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2916	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4524	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3600	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4924	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4124	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1780	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1032	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2792	4652	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1684	4652	schtasks.exe	84

UAC bypass 3 TTPs 6 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	Idle.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4456-1-0x00000000009F0000-0x0000000000CA4000-memory.dmp	dcrat
behavioral2/files/0x000f000000023bae-33.dat	dcrat
behavioral2/files/0x000b000000023b99-77.dat	dcrat
behavioral2/memory/3176-91-0x0000000000EB0000-0x0000000001164000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	3dce7fce69c35c15988ad7bc647d4681.exe

Executes dropped EXE 1 IoCs

pid	Process
3176	Idle.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe

Drops file in Program Files directory 10 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\csrss.exe	3dce7fce69c35c15988ad7bc647d4681.exe
File created	C:\Program Files\Windows Media Player\TextInputHost.exe	3dce7fce69c35c15988ad7bc647d4681.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\RCXB73D.tmp	3dce7fce69c35c15988ad7bc647d4681.exe
File opened for modification	C:\Program Files\Windows Media Player\RCXBBE4.tmp	3dce7fce69c35c15988ad7bc647d4681.exe
File opened for modification	C:\Program Files\Windows Media Player\RCXBBF4.tmp	3dce7fce69c35c15988ad7bc647d4681.exe
File opened for modification	C:\Program Files\Windows Media Player\TextInputHost.exe	3dce7fce69c35c15988ad7bc647d4681.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\csrss.exe	3dce7fce69c35c15988ad7bc647d4681.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\886983d96e3d3e	3dce7fce69c35c15988ad7bc647d4681.exe
File created	C:\Program Files\Windows Media Player\22eafd247d37c3	3dce7fce69c35c15988ad7bc647d4681.exe
File opened for modification	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\RCXB73C.tmp	3dce7fce69c35c15988ad7bc647d4681.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	3dce7fce69c35c15988ad7bc647d4681.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 12 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1032	schtasks.exe
1684	schtasks.exe
780	schtasks.exe
2304	schtasks.exe
2916	schtasks.exe
4524	schtasks.exe
3600	schtasks.exe
4924	schtasks.exe
4124	schtasks.exe
1780	schtasks.exe
3888	schtasks.exe
2792	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
4456	3dce7fce69c35c15988ad7bc647d4681.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe
3176	Idle.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3176	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4456	3dce7fce69c35c15988ad7bc647d4681.exe
Token: SeDebugPrivilege	3176	Idle.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4456 wrote to memory of 936	4456	3dce7fce69c35c15988ad7bc647d4681.exe	97
PID 4456 wrote to memory of 936	4456	3dce7fce69c35c15988ad7bc647d4681.exe	97
PID 936 wrote to memory of 4240	936	cmd.exe	99
PID 936 wrote to memory of 4240	936	cmd.exe	99
PID 936 wrote to memory of 3176	936	cmd.exe	102
PID 936 wrote to memory of 3176	936	cmd.exe	102

System policy modification 1 TTPs 6 IoCs

defense_evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3dce7fce69c35c15988ad7bc647d4681.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3dce7fce69c35c15988ad7bc647d4681.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\3dce7fce69c35c15988ad7bc647d4681.exe
"C:\Users\Admin\AppData\Local\Temp\3dce7fce69c35c15988ad7bc647d4681.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4456
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\xqMEPA9M3G.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:936
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4240
- - C:\Recovery\WindowsRE\Idle.exe
    "C:\Recovery\WindowsRE\Idle.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:3176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3888

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Adobe\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Users\All Users\Adobe\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4524

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Adobe\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Media Player\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Media Player\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.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 "IdleI" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1684

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

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Recovery\WindowsRE\Idle.exe

Filesize
2.7MB

MD5
fcee0616fac5d900415914424278018f

SHA1
f289f1a9274f121f245fa9671480ae251a829934

SHA256
5d1a251a8a296db513c13a195f71fc2cfbfb1b11009b2a6f11ab3c81ef9e5d68

SHA512
79105e57c18b0275536a240c274e15737b5df7cf63079812aafeac7ab222e3dfab8ef3ead6ca8aa95a456a772dd547ca16472a604a15b1d3704e35ff83b62cc7

Download Submit
C:\Users\Admin\AppData\Local\Temp\RCXB518.tmp

Filesize
2.7MB

MD5
3dce7fce69c35c15988ad7bc647d4681

SHA1
bf0b951d922c6e92e40cec56f641a0c48da49b57

SHA256
534190cdacfd4dd6d00505481ff5051320f6168e3740dafbc132a5003146c3bb

SHA512
99e11b00a61b901a0954dbdd6c1b533c2898662584ea296fd1a92b790ffe10690cf2acba4b595e9d517fc3088ec03450c1d1ee1ce9ae8cfe1a15f24ae14ad33e

Download Submit
C:\Users\Admin\AppData\Local\Temp\xqMEPA9M3G.bat

Filesize
195B

MD5
599f4dde11124ba673f39e94b7a5fc3a

SHA1
9f72a42d6b1cff91b8b4d4d6f439ba001c14533c

SHA256
c37fb9a26594b85e31a433790b0717bcfa38475b6a4461ad9abcd5536f3a36f9

SHA512
081512fb581e8d0a461b13dfc997b7564a43a67b28680eef360166a6443bde445a1333bee888f29f03bd3f4e65c00ef4df4dab77ec2b1d4938d4fe262a5ca6a1

Download Submit
memory/3176-92-0x000000001C4C0000-0x000000001C4D2000-memory.dmp

Filesize
72KB

Download
memory/3176-91-0x0000000000EB0000-0x0000000001164000-memory.dmp

Filesize
2.7MB

Download
memory/4456-14-0x000000001C570000-0x000000001CA98000-memory.dmp

Filesize
5.2MB

Download
memory/4456-16-0x000000001C040000-0x000000001C048000-memory.dmp

Filesize
32KB

Download
memory/4456-6-0x0000000002D90000-0x0000000002D98000-memory.dmp

Filesize
32KB

Download
memory/4456-8-0x000000001B7F0000-0x000000001B806000-memory.dmp

Filesize
88KB

Download
memory/4456-10-0x000000001B8A0000-0x000000001B8AA000-memory.dmp

Filesize
40KB

Download
memory/4456-9-0x000000001B810000-0x000000001B818000-memory.dmp

Filesize
32KB

Download
memory/4456-11-0x000000001B8B0000-0x000000001B906000-memory.dmp

Filesize
344KB

Download
memory/4456-12-0x000000001B820000-0x000000001B828000-memory.dmp

Filesize
32KB

Download
memory/4456-13-0x000000001B830000-0x000000001B842000-memory.dmp

Filesize
72KB

Download
memory/4456-0-0x00007FFE0C913000-0x00007FFE0C915000-memory.dmp

Filesize
8KB

Download
memory/4456-17-0x000000001C150000-0x000000001C15C000-memory.dmp

Filesize
48KB

Download
memory/4456-7-0x000000001B7E0000-0x000000001B7F0000-memory.dmp

Filesize
64KB

Download
memory/4456-15-0x000000001B900000-0x000000001B908000-memory.dmp

Filesize
32KB

Download
memory/4456-19-0x000000001C060000-0x000000001C06C000-memory.dmp

Filesize
48KB

Download
memory/4456-18-0x000000001C050000-0x000000001C05E000-memory.dmp

Filesize
56KB

Download
memory/4456-20-0x000000001C070000-0x000000001C07A000-memory.dmp

Filesize
40KB

Download
memory/4456-21-0x000000001C080000-0x000000001C08C000-memory.dmp

Filesize
48KB

Download
memory/4456-5-0x000000001B850000-0x000000001B8A0000-memory.dmp

Filesize
320KB

Download
memory/4456-4-0x000000001B7C0000-0x000000001B7DC000-memory.dmp

Filesize
112KB

Download
memory/4456-3-0x0000000002D80000-0x0000000002D8E000-memory.dmp

Filesize
56KB

Download
memory/4456-87-0x00007FFE0C910000-0x00007FFE0D3D1000-memory.dmp

Filesize
10.8MB

Download
memory/4456-2-0x00007FFE0C910000-0x00007FFE0D3D1000-memory.dmp

Filesize
10.8MB

Download
memory/4456-1-0x00000000009F0000-0x0000000000CA4000-memory.dmp

Filesize
2.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads