dcrat | 63b2109d651e58bdceb6dcd68821e723f4a5ce45875405cf395ff04937ea26b8

Analysis

max time kernel
120s
max time network
126s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 06:14

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General

Target

9fef837bdea2dc9e761d7e177419aa4e.exe
Size

1.1MB
MD5

9fef837bdea2dc9e761d7e177419aa4e
SHA1

528d8bfbcd30c1bb1a4d18798d6c1721607a8854
SHA256

d5f6ca5a453ca37f5b13c6babe8a28e400411adb2b49f348340ec30b8a342d2d
SHA512

73da2bde88483ea1c50b83b15012250e50f0e26cd5e7b6646249fc576041bdc9b002033775bab919f99e42b02effa98978302dc69a4baa6a3a21c2a27b1762bb
SSDEEP

12288:p49I/nL8TnKZPVHR3E/bS2vkRNJLXseJQdErvNKj6SKm+eAIhu181d6rsPH:pngTKZ5RU/xG7zsEyEve6SZ+dIe8usv

Score

10^/10

dcrat defense_evasion execution infostealer persistence 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

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\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral29/files/0x000600000001a4c7-19.dat	dcrat
behavioral29/memory/2084-1-0x0000000000B60000-0x0000000000C76000-memory.dmp	dcrat
behavioral29/files/0x000d00000001a4c7-65.dat	dcrat
behavioral29/memory/2068-103-0x0000000001050000-0x0000000001166000-memory.dmp	dcrat

Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2360	powershell.exe
2912	powershell.exe
2504	powershell.exe
2336	powershell.exe
2828	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
2068	dwm.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\KBDTH2\\winlogon.exe\""	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\ProgramData\\Templates\\dwm.exe\""	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\IKEEXT\\dllhost.exe\""	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\ProgramData\\Start Menu\\smss.exe\""	9fef837bdea2dc9e761d7e177419aa4e.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	dwm.exe

Drops file in System32 directory 10 IoCs

description	ioc	Process
File created	C:\Windows\System32\KBDTH2\winlogon.exe	9fef837bdea2dc9e761d7e177419aa4e.exe
File created	C:\Windows\System32\KBDTH2\cc11b995f2a76d	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\KBDTH2\RCX584F.tmp	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\IKEEXT\dllhost.exe	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\KBDTH2\winlogon.exe	9fef837bdea2dc9e761d7e177419aa4e.exe
File created	C:\Windows\System32\IKEEXT\dllhost.exe	9fef837bdea2dc9e761d7e177419aa4e.exe
File created	C:\Windows\System32\IKEEXT\5940a34987c991	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\KBDTH2\RCX5850.tmp	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\IKEEXT\RCX5C59.tmp	9fef837bdea2dc9e761d7e177419aa4e.exe
File opened for modification	C:\Windows\System32\IKEEXT\RCX5C5A.tmp	9fef837bdea2dc9e761d7e177419aa4e.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2908	schtasks.exe
3012	schtasks.exe
2560	schtasks.exe
2712	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2084	9fef837bdea2dc9e761d7e177419aa4e.exe
2084	9fef837bdea2dc9e761d7e177419aa4e.exe
2084	9fef837bdea2dc9e761d7e177419aa4e.exe
2504	powershell.exe
2360	powershell.exe
2336	powershell.exe
2912	powershell.exe
2828	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2084	9fef837bdea2dc9e761d7e177419aa4e.exe
Token: SeDebugPrivilege	2504	powershell.exe
Token: SeDebugPrivilege	2360	powershell.exe
Token: SeDebugPrivilege	2336	powershell.exe
Token: SeDebugPrivilege	2912	powershell.exe
Token: SeDebugPrivilege	2828	powershell.exe
Token: SeDebugPrivilege	2068	dwm.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 2504	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	35
PID 2084 wrote to memory of 2504	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	35
PID 2084 wrote to memory of 2504	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	35
PID 2084 wrote to memory of 2336	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	36
PID 2084 wrote to memory of 2336	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	36
PID 2084 wrote to memory of 2336	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	36
PID 2084 wrote to memory of 2828	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	37
PID 2084 wrote to memory of 2828	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	37
PID 2084 wrote to memory of 2828	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	37
PID 2084 wrote to memory of 2360	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	38
PID 2084 wrote to memory of 2360	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	38
PID 2084 wrote to memory of 2360	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	38
PID 2084 wrote to memory of 2912	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	39
PID 2084 wrote to memory of 2912	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	39
PID 2084 wrote to memory of 2912	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	39
PID 2084 wrote to memory of 2884	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	44
PID 2084 wrote to memory of 2884	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	44
PID 2084 wrote to memory of 2884	2084	9fef837bdea2dc9e761d7e177419aa4e.exe	44
PID 2884 wrote to memory of 2160	2884	cmd.exe	47
PID 2884 wrote to memory of 2160	2884	cmd.exe	47
PID 2884 wrote to memory of 2160	2884	cmd.exe	47
PID 2884 wrote to memory of 2068	2884	cmd.exe	48
PID 2884 wrote to memory of 2068	2884	cmd.exe	48
PID 2884 wrote to memory of 2068	2884	cmd.exe	48

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\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	9fef837bdea2dc9e761d7e177419aa4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.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\9fef837bdea2dc9e761d7e177419aa4e.exe
"C:\Users\Admin\AppData\Local\Temp\9fef837bdea2dc9e761d7e177419aa4e.exe"
1⤵
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2084
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\9fef837bdea2dc9e761d7e177419aa4e.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2504
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\KBDTH2\winlogon.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2336
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command Add-MpPreference -ExclusionPath 'C:\ProgramData\Templates\dwm.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2828
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\IKEEXT\dllhost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2360
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell" -Command Add-MpPreference -ExclusionPath 'C:\ProgramData\Start Menu\smss.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2912
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\T3hx4w0tk8.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2884
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2160
- - C:\ProgramData\Templates\dwm.exe
    "C:\ProgramData\Templates\dwm.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:2068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\KBDTH2\winlogon.exe'" /rl HIGHEST /f
1⤵
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\ProgramData\Templates\dwm.exe'" /rl HIGHEST /f
1⤵
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\IKEEXT\dllhost.exe'" /rl HIGHEST /f
1⤵
- Scheduled Task/Job: Scheduled Task
PID:2560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\ProgramData\Start Menu\smss.exe'" /rl HIGHEST /f
1⤵
- Scheduled Task/Job: Scheduled Task
PID:3012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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

C:\ProgramData\Microsoft\Windows\Start Menu\smss.exe

Filesize
1.1MB

MD5
c2bed82e8d5ff329a17543c788480250

SHA1
a16a5e6e8e04e98ab18d7670ddb00256f910f754

SHA256
750729bd478aa7085f853a731eb1d756a8f44fe774c090f505b599d07146fffb

SHA512
1e9ec0ba39c9fb761f095881132f8daf2a9c67c354d55fc5c3e771ab146d00528f6be8cb9bc17f87ae04cb31b0738ae61d1fed3e949878d266debab2bb7e7fe5

Download Submit
C:\Users\Admin\AppData\Local\Temp\RCX563C.tmp

Filesize
1.1MB

MD5
9fef837bdea2dc9e761d7e177419aa4e

SHA1
528d8bfbcd30c1bb1a4d18798d6c1721607a8854

SHA256
d5f6ca5a453ca37f5b13c6babe8a28e400411adb2b49f348340ec30b8a342d2d

SHA512
73da2bde88483ea1c50b83b15012250e50f0e26cd5e7b6646249fc576041bdc9b002033775bab919f99e42b02effa98978302dc69a4baa6a3a21c2a27b1762bb

Download Submit
C:\Users\Admin\AppData\Local\Temp\T3hx4w0tk8.bat

Filesize
196B

MD5
26c359dd10dcad2a95dbfcac85b75172

SHA1
5746e5d2b6f7f958c1904fd9133ea6543773de44

SHA256
5d24f92f6302ab671b16d0b7636d83ab66cb0b459d3d1bb23a619587bbe66e7b

SHA512
c7291afadf2a1ef6200acc9e5c23cdd1f2f5e480ce0c79f819e33a66532d7fcad6fc6f62848c1ab7b385231dd6b0c7098f0436a2bf5fb0453975c8893094c16e

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
18186bad6314edd25e6ca444021e70fd

SHA1
3e0113f1b2155622f8d5e90aeb61d8d5949858a8

SHA256
ab0082e4e5c92b0097ac1b47b12149745f2ffb828934394a09954976e89b7a23

SHA512
843d059a0f6bcc094fe2eb3f52a235914a8fbb1b32c3c42f7bcaaa901f8352635e2b13acf7e1c15d17c0ac4859986a831b6f80b41a15a80ecc2137975b593172

Download Submit
memory/2068-103-0x0000000001050000-0x0000000001166000-memory.dmp

Filesize
1.1MB

Download
memory/2084-0-0x000007FEF5C03000-0x000007FEF5C04000-memory.dmp

Filesize
4KB

Download
memory/2084-2-0x000007FEF5C00000-0x000007FEF65EC000-memory.dmp

Filesize
9.9MB

Download
memory/2084-1-0x0000000000B60000-0x0000000000C76000-memory.dmp

Filesize
1.1MB

Download
memory/2084-3-0x0000000000650000-0x0000000000660000-memory.dmp

Filesize
64KB

Download
memory/2084-4-0x0000000000660000-0x000000000066A000-memory.dmp

Filesize
40KB

Download
memory/2084-82-0x000007FEF5C00000-0x000007FEF65EC000-memory.dmp

Filesize
9.9MB

Download
memory/2084-5-0x0000000000670000-0x000000000067C000-memory.dmp

Filesize
48KB

Download
memory/2084-6-0x0000000000680000-0x0000000000688000-memory.dmp

Filesize
32KB

Download
memory/2084-7-0x0000000000690000-0x000000000069A000-memory.dmp

Filesize
40KB

Download
memory/2504-83-0x000000001B610000-0x000000001B8F2000-memory.dmp

Filesize
2.9MB

Download
memory/2504-88-0x0000000002700000-0x0000000002708000-memory.dmp

Filesize
32KB

Download