dcrat | 9685df993979777cdc3a038aada09660d17c6355e0cd262d5948eae69d4d310b

Analysis

user interaction
yes
max time kernel
208s
max time network
170s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/08/2026, 08:36

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General

Target
DCRatBuild.exe
Size 1.7MB
Sample260803-kh3a5ssang
SHA256 9685df993979777cdc3a038aada09660d17c6355e0cd262d5948eae69d4d310b
MD5 fa408310ec41476a2e10ca53ce2771c5
SHA1 408951402673a7de425525b364c1c558b423233d
SHA512 7f3fe038fe6c0530cb6d4a48a404ff53ee5019c5253f53e5ab041ffdcab6e3481e3fe421f8ae535bc96d9a0a14b8f01df87b2176371921b35d5b57127ce1258d
SSDEEP 49152:ubA3j9aQL0ejYwuDL3ITX1TW/saxGVRhnoG4kA:ubKa+cwomTesxVjJA
TLSH
T122859D027E44CA59F0085A73C1EF420847B5ED106AA6E71BBDBA737D55123937C2EACB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution dcrat infostealer persistence rat

Malware Config

Signatures

Family: DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000d00000001c50b-12.dat	dcrat
behavioral2/memory/252-14-0x0000000000970000-0x0000000000AE4000-memory.dmp	dcrat

Process spawned unexpected child process 6 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	1936	972	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5564	972	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1928	972	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	464	972	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1256	972	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	428	972	schtasks.exe	93

Executes dropped EXE 3 IoCs

pid	Process
252	Msdriver.exe
1944	sihost.exe
5552	dllhost.exe

Executes a VBScript file via the Windows Script Host. 1 TTPs 1 IoCs

execution

Visual Basic

T1059.005

pid	Process
4544	WScript.exe

SmartAssembly .NET packer 1 IoCs

Detects SmartAssembly .NET packer.

resource	yara_rule
behavioral2/memory/252-23-0x000000001B7D0000-0x000000001B7DC000-memory.dmp	SmartAssembly

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Mail\dllhost.exe	Msdriver.exe
File created	C:\Program Files\Windows Mail\5940a34987c991	Msdriver.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Boot\EFI_EX\ru-RU\conhost.exe	Msdriver.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3112	cmd.exe

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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DCRatBuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1875162379-3804078649-638427191-1000_Classes\Local Settings	DCRatBuild.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1936	schtasks.exe
5564	schtasks.exe
1928	schtasks.exe
464	schtasks.exe
1256	schtasks.exe
428	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
252	Msdriver.exe
1944	sihost.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	252	Msdriver.exe
Token: SeDebugPrivilege	1944	sihost.exe
Token: SeDebugPrivilege	5552	dllhost.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3280 wrote to memory of 4544	3280	DCRatBuild.exe	89
PID 4544 wrote to memory of 3112	4544	WScript.exe	90
PID 3112 wrote to memory of 252	3112	cmd.exe	92
PID 252 wrote to memory of 1944	252	Msdriver.exe	100

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\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3280
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\agentcrtDllnet\JYJC8naBSjKR.vbe"
  2⤵
  - Executes a VBScript file via the Windows Script Host.
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4544
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\agentcrtDllnet\zbuef8w479PHQ93.bat" "
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3112
  - - C:\agentcrtDllnet\Msdriver.exe
      "C:\agentcrtDllnet\Msdriver.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:252
    - - C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe
        
        "C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Mail\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:464

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 14 /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:428

C:\Program Files\Windows Mail\dllhost.exe
"C:\Program Files\Windows Mail\dllhost.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5552

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Visual Basic

T1059.005

Windows Command Shell

T1059.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

JYJC8naBSjKR.vbe

Path C:\agentcrtDllnet\JYJC8naBSjKR.vbe
Size 206B
SHA256 870320531cd2205d6decb7d422ab51aae32545aa9a28df820272f22cf311164f
MD5 b9384716c5480d7b14c52cbcb55e9132
SHA1 dbbf451e566aede61e68e942fdc12f246be0d213
SHA512 3441cab1e750cf2de1a443cfdf2d1bbaffe20dfbffc0802f79095812c142580f1cc4b33fd15ca045dc7301c1edba1d617f7c84c8989f5049f5d1df2b0bb379de
TLSH
T164D0235944DA9288CC1489D7C355D42C1F59655EC7034FD144ACF68545514DB347C397
MD5 SHA1 SHA512 TLSH

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Msdriver.exe

Path C:\agentcrtDllnet\Msdriver.exe
Size 1.4MB
SHA256 7f882a01a71bee33400cce4dbe6dab1de7241bc63f05be37a37244d059a3ec15
MD5 456335574566088b8d80e46b807dabcf
SHA1 e43d8a89e5f27ed529e442a0c6a1a3c97446e9ec
SHA512 7579313823e1be5d42a701f873bdb4f2b8dd652e22eca90e33efb1672ce0570adce2f00dcc3748d77bad0a04b817ceb4e3506a04ccffc6c617c9222385c3411d
SSDEEP 24576:daQL0eIHqZYwGrDBNBd3APCmJH35/TziNFZGaxGjZlXhUq3AA0iN4koi:daQL0ejYwuDL3ITX1TW/saxGVRhnoG4k
TLSH
T176657B027E04CA59F0085673C1EF420847B5D9516AA6E71BBDBB73BE15123A73C2E9CB
MD5 SHA1 SHA512 SSDEEP TLSH

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zbuef8w479PHQ93.bat

Path C:\agentcrtDllnet\zbuef8w479PHQ93.bat
Size 32B
SHA256 95d176b51b49d1b8920f589a7e0d0669319722233d1aa0df33848e5aa696a932
MD5 04367f25b67a9420df75ba70094a4adb
SHA1 38c800cf8f0a232b6ea70b5e87bc0941776e3ca6
SHA512 ece906965d898ab5e39bfbee243819c4a579bb0f1bcca8d9d3b0fc788318aced9df344cd79c91b77358541e2ee977f7fd14a2555916ef16a97ee4f062dc2dac1
MD5 SHA1 SHA512

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memory/252-19-0x000000001C050000-0x000000001C05C000-memory.dmp

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memory/252-21-0x0000000002CF0000-0x0000000002D02000-memory.dmp

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memory/252-16-0x000000001B760000-0x000000001B7B0000-memory.dmp

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memory/252-17-0x0000000001250000-0x0000000001262000-memory.dmp

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memory/252-18-0x0000000002D00000-0x0000000002D08000-memory.dmp

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memory/252-14-0x0000000000970000-0x0000000000AE4000-memory.dmp

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memory/252-20-0x0000000001270000-0x000000000127C000-memory.dmp

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memory/252-15-0x0000000002BC0000-0x0000000002BDC000-memory.dmp

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memory/252-24-0x000000001B7E0000-0x000000001B7EE000-memory.dmp

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memory/252-23-0x000000001B7D0000-0x000000001B7DC000-memory.dmp

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memory/252-22-0x000000001C7F0000-0x000000001CD18000-memory.dmp

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memory/252-25-0x000000001B7F0000-0x000000001B7FC000-memory.dmp

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memory/1944-29-0x0000000000FF0000-0x0000000001002000-memory.dmp

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memory/1944-30-0x000000001BFA0000-0x000000001BFB2000-memory.dmp

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