dcrat | 394c5bdb282b16f8fc323f01c9a0ebe0a3824c95efbc082a5ae7b1d547ab3617

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19/01/2025, 03:31

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General

Target
154029aecb8134930418ece2437864b8.exe
Size 1.5MB
Sample250119-d22qdsvmem
SHA256 394c5bdb282b16f8fc323f01c9a0ebe0a3824c95efbc082a5ae7b1d547ab3617
MD5 154029aecb8134930418ece2437864b8
SHA1 a43825d5c82e4266a37e60a746c31ab128b2a4a1
SHA512 2cc0dd8965fb53479fed5107ec2b8ba90ae15dbbc22f1d0d7bffc573cf049d69ce745840fdaa582060940f5be8381cfd5ecec870943d6a3ddda95c9f32a9826c
SSDEEP 24576:u/R6JpYYCpuA5TwiNgFE/4vZy270wlc8cz4lc2zVg5OlyxJ:uZ6a8+DsZ5lyzIcUawly
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat 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 18 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	3992	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2204	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1452	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2440	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2640	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5000	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2436	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	348	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3972	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3948	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	432	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4800	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2768	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3332	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2988	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1432	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4576	4760	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2384	4760	schtasks.exe	85

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/5116-1-0x0000000000890000-0x0000000000A22000-memory.dmp	dcrat
behavioral2/files/0x0007000000023ccd-21.dat	dcrat
behavioral2/files/0x0007000000023cd6-50.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	154029aecb8134930418ece2437864b8.exe

Executes dropped EXE 1 IoCs

pid	Process
2196	spoolsv.exe

Drops file in Program Files directory 20 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\9e8d7a4ca61bd9	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\RCXB773.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Common Files\RuntimeBroker.exe	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Common Files\RCXB988.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Portable Devices\sppsvc.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files\Common Files\RuntimeBroker.exe	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Portable Devices\RCXAF0F.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\RCXB348.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\RCXB349.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\RCXB774.tmp	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\f3b6ecef712a24	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\0a1fd5f707cd16	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Portable Devices\RCXAEFF.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files (x86)\Windows Portable Devices\sppsvc.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Program Files (x86)\Windows Portable Devices\0a1fd5f707cd16	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Program Files\Common Files\RCXBA06.tmp	154029aecb8134930418ece2437864b8.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SKB\LanguageModels\RCXB55E.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Windows\SKB\LanguageModels\RCXB55F.tmp	154029aecb8134930418ece2437864b8.exe
File opened for modification	C:\Windows\SKB\LanguageModels\System.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Windows\SKB\LanguageModels\System.exe	154029aecb8134930418ece2437864b8.exe
File created	C:\Windows\SKB\LanguageModels\27d1bcfc3c54e0	154029aecb8134930418ece2437864b8.exe
File created	C:\Windows\Boot\RuntimeBroker.exe	154029aecb8134930418ece2437864b8.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-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	154029aecb8134930418ece2437864b8.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
5000	schtasks.exe
2436	schtasks.exe
3972	schtasks.exe
432	schtasks.exe
2384	schtasks.exe
3992	schtasks.exe
1452	schtasks.exe
3948	schtasks.exe
4800	schtasks.exe
2988	schtasks.exe
2204	schtasks.exe
2640	schtasks.exe
3332	schtasks.exe
2440	schtasks.exe
348	schtasks.exe
2768	schtasks.exe
1432	schtasks.exe
4576	schtasks.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
5116	154029aecb8134930418ece2437864b8.exe
2196	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5116	154029aecb8134930418ece2437864b8.exe
Token: SeDebugPrivilege	2196	spoolsv.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5116 wrote to memory of 1648	5116	154029aecb8134930418ece2437864b8.exe	105
PID 5116 wrote to memory of 1648	5116	154029aecb8134930418ece2437864b8.exe	105
PID 1648 wrote to memory of 1656	1648	cmd.exe	107
PID 1648 wrote to memory of 1656	1648	cmd.exe	107
PID 1648 wrote to memory of 2196	1648	cmd.exe	116
PID 1648 wrote to memory of 2196	1648	cmd.exe	116

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\154029aecb8134930418ece2437864b8.exe
"C:\Users\Admin\AppData\Local\Temp\154029aecb8134930418ece2437864b8.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5116
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\kfw7FZjNig.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1656
- - C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe
    "C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2196

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Portable Devices\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows Portable Devices\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1452

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 13 /tr "'C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3972

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Windows\SKB\LanguageModels\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\SKB\LanguageModels\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Windows\SKB\LanguageModels\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2988

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Program Files\Common Files\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Common Files\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4576

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files\Common Files\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2384

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

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

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

sppsvc.exe

Path C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\sppsvc.exe
Size 1.5MB
SHA256 394c5bdb282b16f8fc323f01c9a0ebe0a3824c95efbc082a5ae7b1d547ab3617
MD5 154029aecb8134930418ece2437864b8
SHA1 a43825d5c82e4266a37e60a746c31ab128b2a4a1
SHA512 2cc0dd8965fb53479fed5107ec2b8ba90ae15dbbc22f1d0d7bffc573cf049d69ce745840fdaa582060940f5be8381cfd5ecec870943d6a3ddda95c9f32a9826c
SSDEEP 24576:u/R6JpYYCpuA5TwiNgFE/4vZy270wlc8cz4lc2zVg5OlyxJ:uZ6a8+DsZ5lyzIcUawly
MD5 SHA1 SHA512 SSDEEP

Submit Download

RCXB134.tmp

Path C:\Recovery\WindowsRE\RCXB134.tmp
Size 1.5MB
SHA256 6344d2c73350e07c8e30d64180483de154713efe517422b4b23d6a9de376901e
MD5 b66ab928d005c01e272ac126df443b9a
SHA1 aa31d93b26e4172953a46a3c9b68a3221e69220a
SHA512 2d738a0854c1e9e83f9a6e03978e9bb10ba33869f34cfe4cbfb85b22e478269b5f23b5f5f77509b5f4e40d20c242ae0779e308c460f45beb342002ec03afb53e
SSDEEP 24576:u/R6JpYYCpuA5TwiNgFE/4vZy270wlc8cz4lc2zVg5OlyxJ:uZ6a8+DsZ5lyzIcUawly
MD5 SHA1 SHA512 SSDEEP

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kfw7FZjNig.bat

Path C:\Users\Admin\AppData\Local\Temp\kfw7FZjNig.bat
Size 226B
SHA256 83b4acf63afdd92a33cdccaf41884dab6e4df4803d926225afff85eddd9bed6b
MD5 0d0088b7f8e9c48c367823fe9a604a81
SHA1 ab974e24ebdfc19014affc9ecec1de98f9732bb9
SHA512 c6e4dc33cbc9c49cd34d83d7d5d84211091a0ed844907d1119b4fcb71342803681892a5842db737dfb82b7fa6544d2024fc3a84056c00fb3ad5191cc7c5f5edd
MD5 SHA1 SHA512

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memory/5116-8-0x000000001B790000-0x000000001B79C000-memory.dmp

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memory/5116-10-0x000000001B7B0000-0x000000001B7BE000-memory.dmp

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memory/5116-4-0x000000001B7E0000-0x000000001B830000-memory.dmp

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memory/5116-6-0x0000000002C30000-0x0000000002C46000-memory.dmp

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memory/5116-7-0x0000000002C50000-0x0000000002C60000-memory.dmp

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memory/5116-0-0x00007FF976223000-0x00007FF976225000-memory.dmp

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memory/5116-11-0x000000001B7C0000-0x000000001B7CE000-memory.dmp

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memory/5116-5-0x0000000001340000-0x0000000001350000-memory.dmp

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memory/5116-9-0x000000001B7A0000-0x000000001B7AC000-memory.dmp

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memory/5116-12-0x000000001B7D0000-0x000000001B7DA000-memory.dmp

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memory/5116-3-0x0000000001360000-0x000000000137C000-memory.dmp

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memory/5116-2-0x00007FF976220000-0x00007FF976CE1000-memory.dmp

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memory/5116-107-0x00007FF976220000-0x00007FF976CE1000-memory.dmp

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memory/5116-1-0x0000000000890000-0x0000000000A22000-memory.dmp

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