dcrat | 30d404945af42d77bfd6ac92739486e8d00496a977ba6a6f0240cd20b7989f2c

Analysis

max time kernel
94s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10/01/2025, 04:26

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General

Target
ca1c3f84e0259d9c423e34e20840f142.exe
Size 3.3MB
Sample250110-e2hsysskaz
SHA256 30d404945af42d77bfd6ac92739486e8d00496a977ba6a6f0240cd20b7989f2c
MD5 ca1c3f84e0259d9c423e34e20840f142
SHA1 3efc257f5027a1a1a205adcdbcb999e1ef8b3b7d
SHA512 8cf6d715fbcad8eff71f4102479ed189a8e71438613225ae26c4e40dd696152a9d2efec028d602b8e25902aeea25961541749029d30a6f5fce5fd36d997fd5e1
SSDEEP 98304:0LMvB0KtBC+ZiFJCY4zsqyv7TUws7LRh1Bk308m3/T:0gvOK9MF5qy/UZdz8Q/T
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat 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 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	4024	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4724	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	216	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4368	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2684	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4564	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2164	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3228	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4668	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	400	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4228	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4324	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5020	3488	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5052	3488	schtasks.exe	82

UAC bypass 3 TTPs 6 IoCs

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"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	csrss.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2308-1-0x0000000000B30000-0x0000000000E8C000-memory.dmp	dcrat
behavioral2/files/0x0008000000023c11-22.dat	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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	ca1c3f84e0259d9c423e34e20840f142.exe

Executes dropped EXE 1 IoCs

pid	Process
3300	csrss.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\PLA\smss.exe	ca1c3f84e0259d9c423e34e20840f142.exe
File created	C:\Windows\PLA\69ddcba757bf72	ca1c3f84e0259d9c423e34e20840f142.exe
File created	C:\Windows\appcompat\SearchApp.exe	ca1c3f84e0259d9c423e34e20840f142.exe
File created	C:\Windows\appcompat\38384e6a620884	ca1c3f84e0259d9c423e34e20840f142.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-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	ca1c3f84e0259d9c423e34e20840f142.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
4024	schtasks.exe
4668	schtasks.exe
4228	schtasks.exe
4324	schtasks.exe
5052	schtasks.exe
4724	schtasks.exe
2684	schtasks.exe
2660	schtasks.exe
4564	schtasks.exe
2164	schtasks.exe
3228	schtasks.exe
400	schtasks.exe
5020	schtasks.exe
216	schtasks.exe
4368	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
2308	ca1c3f84e0259d9c423e34e20840f142.exe
3300	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2308	ca1c3f84e0259d9c423e34e20840f142.exe
Token: SeDebugPrivilege	3300	csrss.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2308 wrote to memory of 4184	2308	ca1c3f84e0259d9c423e34e20840f142.exe	98
PID 2308 wrote to memory of 4184	2308	ca1c3f84e0259d9c423e34e20840f142.exe	98
PID 4184 wrote to memory of 1756	4184	cmd.exe	100
PID 4184 wrote to memory of 1756	4184	cmd.exe	100
PID 4184 wrote to memory of 3300	4184	cmd.exe	101
PID 4184 wrote to memory of 3300	4184	cmd.exe	101

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ca1c3f84e0259d9c423e34e20840f142.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	csrss.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\ca1c3f84e0259d9c423e34e20840f142.exe
"C:\Users\Admin\AppData\Local\Temp\ca1c3f84e0259d9c423e34e20840f142.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2308
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\6k42qsZYF6.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4184
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1756
- - C:\Users\Default User\csrss.exe
    "C:\Users\Default User\csrss.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:3300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\Windows\PLA\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4368

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\PLA\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Windows\PLA\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 14 /tr "'C:\Users\Default User\StartMenuExperienceHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Users\Default User\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2164

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 11 /tr "'C:\Windows\appcompat\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\appcompat\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 14 /tr "'C:\Windows\appcompat\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5052

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

csrss.exe

Path C:\Recovery\WindowsRE\csrss.exe
Size 3.3MB
SHA256 30d404945af42d77bfd6ac92739486e8d00496a977ba6a6f0240cd20b7989f2c
MD5 ca1c3f84e0259d9c423e34e20840f142
SHA1 3efc257f5027a1a1a205adcdbcb999e1ef8b3b7d
SHA512 8cf6d715fbcad8eff71f4102479ed189a8e71438613225ae26c4e40dd696152a9d2efec028d602b8e25902aeea25961541749029d30a6f5fce5fd36d997fd5e1
SSDEEP 98304:0LMvB0KtBC+ZiFJCY4zsqyv7TUws7LRh1Bk308m3/T:0gvOK9MF5qy/UZdz8Q/T
MD5 SHA1 SHA512 SSDEEP

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6k42qsZYF6.bat

Path C:\Users\Admin\AppData\Local\Temp\6k42qsZYF6.bat
Size 196B
SHA256 f7ac4237ce3929c23cb83175c6f36b4e6165081d36c5b7531792f9c5ffde7d3a
MD5 df963326e7c3c9a5e747922c13808893
SHA1 4b3121bbfe1ec7c556a1d25d12f94177202e8611
SHA512 782cc3c305fdd8bb7a20703610ab073ad7065af2abc5c18da6a198833cefe0b17c5e38491d141c861101c895065911a7cf88819c69352246aa610dfa1fc9a5f6
MD5 SHA1 SHA512

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memory/2308-8-0x000000001BCA0000-0x000000001BCF6000-memory.dmp

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memory/2308-9-0x0000000002FF0000-0x0000000002FFC000-memory.dmp

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memory/2308-4-0x0000000002FC0000-0x0000000002FDC000-memory.dmp

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memory/2308-5-0x000000001BC50000-0x000000001BCA0000-memory.dmp

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memory/2308-7-0x0000000002FE0000-0x0000000002FEA000-memory.dmp

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memory/2308-6-0x00000000016B0000-0x00000000016B8000-memory.dmp

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memory/2308-0-0x00007FFEF6F03000-0x00007FFEF6F05000-memory.dmp

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memory/2308-3-0x00000000016A0000-0x00000000016AE000-memory.dmp

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memory/2308-10-0x0000000003000000-0x0000000003012000-memory.dmp

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memory/2308-11-0x000000001C8F0000-0x000000001CE18000-memory.dmp

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memory/2308-12-0x000000001BB10000-0x000000001BB1E000-memory.dmp

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memory/2308-13-0x000000001BB20000-0x000000001BB2C000-memory.dmp

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memory/2308-2-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

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memory/2308-29-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

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memory/2308-1-0x0000000000B30000-0x0000000000E8C000-memory.dmp

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