dcrat | 4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf

General

Target

4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Size

682KB
MD5

3e6845042b6b515f56ebf0a1f0fb62dc
SHA1

aa09905cddd7e99653f3ef4bb801d1067c7b3369
SHA256

4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf
SHA512

8070194590310fe4eb0585c23f5d05d10cf8fbb619bae245531ba7e529e677a13290262c64694b4a180ecb83711a0f970048ceec7dd92ba5409bc597791c1dab
SSDEEP

12288:RqnO3mwJNoGFAgHCRvp1i/fjqJRYFInDrX/xTU3JgXDV6blx1wgtra7B:R+O3mwJnCRvEMxnDVSwgY

Score

10^/10

dcrat evasion 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

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	2808	2732	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2732	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2628	2732	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2216	2732	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2704	2732	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2612	2732	schtasks.exe	30

UAC bypass 3 TTPs 3 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"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2976-1-0x00000000001C0000-0x0000000000272000-memory.dmp	dcrat
behavioral1/files/0x00060000000174a2-17.dat	dcrat
behavioral1/files/0x0008000000018c26-32.dat	dcrat
behavioral1/memory/1156-96-0x0000000000BF0000-0x0000000000CA2000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1156	csrss.exe

Adds Run key to start application 2 TTPs 6 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\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf = "\"C:\\ProgramData\\Microsoft Help\\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\ProgramData\\Desktop\\smss.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\P2PGraph\\dllhost.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\ddraw\\lsm.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Users\\Default User\\csrss.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\ntoskrnl\\lsass.exe\""	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

Drops file in System32 directory 15 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\ntoskrnl\RCXAD1E.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\P2PGraph\RCXA6A1.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\ddraw\RCXA914.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\ntoskrnl\RCXAD1D.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\ddraw\RCXA913.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\ntoskrnl\lsass.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\P2PGraph\RCXA6A2.tmp	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\ddraw\lsm.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\ddraw\101b941d020240259ca4912829b53995ad543df6	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\P2PGraph\5940a34987c99120d96dace90a3f93f329dcad63	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\ddraw\lsm.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\ntoskrnl\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\P2PGraph\dllhost.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File opened for modification	C:\Windows\System32\ntoskrnl\lsass.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
File created	C:\Windows\System32\P2PGraph\dllhost.exe	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

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

System Information Discovery
T1082

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
2720	schtasks.exe
2628	schtasks.exe
2216	schtasks.exe
2704	schtasks.exe
2612	schtasks.exe
2808	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Token: SeDebugPrivilege	1156	csrss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2976 wrote to memory of 1156	2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe	38
PID 2976 wrote to memory of 1156	2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe	38
PID 2976 wrote to memory of 1156	2976	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe	38

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.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\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe
"C:\Users\Admin\AppData\Local\Temp\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.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:2976
- C:\Users\Default User\csrss.exe
  "C:\Users\Default User\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1156

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf" /sc ONLOGON /tr "'C:\ProgramData\Microsoft Help\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\ProgramData\Desktop\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\P2PGraph\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\ddraw\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2216

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:2704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\ntoskrnl\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2612

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\Microsoft Help\4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf.exe

Filesize
682KB

MD5
1ef9bba6604d981eeb1f78f5a8d7972d

SHA1
2ff6fed6b780726be10da75f766c6f3dd301067c

SHA256
513b6b83f461f3e8ebb507eeb21379e9a177dad1f085baeb9fb4d26e1ba6fec2

SHA512
c2ffdbf8936d7c0955da5ab5f09aba9234f305a79d9372388748bafc9c8f2fc0107682961ff6bd1f38c7e8c1a4a8b62fe1a916571de971b82f5e7fa08b821a60

Download Submit
C:\Users\Default\csrss.exe

Filesize
682KB

MD5
3e6845042b6b515f56ebf0a1f0fb62dc

SHA1
aa09905cddd7e99653f3ef4bb801d1067c7b3369

SHA256
4b69a0f48caf3523e5c88381a099228e603347664b92dc76e7a5f42754a814cf

SHA512
8070194590310fe4eb0585c23f5d05d10cf8fbb619bae245531ba7e529e677a13290262c64694b4a180ecb83711a0f970048ceec7dd92ba5409bc597791c1dab

Download Submit
memory/1156-96-0x0000000000BF0000-0x0000000000CA2000-memory.dmp

Filesize
712KB

Download
memory/2976-3-0x0000000000150000-0x0000000000160000-memory.dmp

Filesize
64KB

Download
memory/2976-4-0x0000000000170000-0x000000000017C000-memory.dmp

Filesize
48KB

Download
memory/2976-5-0x0000000000190000-0x000000000019C000-memory.dmp

Filesize
48KB

Download
memory/2976-6-0x00000000001B0000-0x00000000001BA000-memory.dmp

Filesize
40KB

Download
memory/2976-7-0x0000000000160000-0x0000000000168000-memory.dmp

Filesize
32KB

Download
memory/2976-8-0x0000000000290000-0x000000000029C000-memory.dmp

Filesize
48KB

Download
memory/2976-0-0x000007FEF5213000-0x000007FEF5214000-memory.dmp

Filesize
4KB

Download
memory/2976-2-0x000007FEF5210000-0x000007FEF5BFC000-memory.dmp

Filesize
9.9MB

Download
memory/2976-1-0x00000000001C0000-0x0000000000272000-memory.dmp

Filesize
712KB

Download
memory/2976-97-0x000007FEF5210000-0x000007FEF5BFC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads