dcrat | 6e493132db3dfb86fe69552649d14eee2771430d42ff1a50f96e3e640acbf2f0

General

Target

DCRatBuild.exe
Size

1.3MB
MD5

eec69775acc89f2f67ecb0d80dc029a5
SHA1

dcd800fd58fec732c0feae2febfe947f45d3944e
SHA256

6e493132db3dfb86fe69552649d14eee2771430d42ff1a50f96e3e640acbf2f0
SHA512

efb125891360665b85c5b11004da2de33e2f13abcf9406aa13ceb222e5ccbf5779d802cedf0f27f8e41d1a84d523a6a279e6d1bf303e035369f0bfe426457053
SSDEEP

24576:u2G/nvxW3WieCGKjeM+4v4Rr6joRBbULA70dqMgkXIdu3GbyP+m:ubA3jGKTmMmULA7CbId8Gbo

Score

10^/10

dcrat discovery evasion 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 24 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	3040	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	876	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3100	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2352	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3076	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2780	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1456	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	464	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2164	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2340	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4772	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1152	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1148	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2104	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3860	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1876	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1792	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4540	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2060	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	448	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5072	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	256	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	436	2504	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5016	2504	schtasks.exe	81

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x001d00000002aad5-10.dat	dcrat
behavioral2/memory/3152-13-0x0000000000A30000-0x0000000000B3C000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 2 IoCs

pid	Process
3152	mscontainer.exe
2568	unsecapp.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\Hydrogen\BakedPlugins\Physics\fontdrvhost.exe	mscontainer.exe
File created	C:\Windows\System32\Hydrogen\BakedPlugins\Physics\5b884080fd4f94	mscontainer.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\BitLockerDiscoveryVolumeContents\System.exe	mscontainer.exe
File created	C:\Windows\BitLockerDiscoveryVolumeContents\27d1bcfc3c54e0	mscontainer.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 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	reg.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-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings	DCRatBuild.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
4488	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2340	schtasks.exe
4540	schtasks.exe
2060	schtasks.exe
3100	schtasks.exe
3076	schtasks.exe
464	schtasks.exe
1148	schtasks.exe
1876	schtasks.exe
1792	schtasks.exe
256	schtasks.exe
3040	schtasks.exe
876	schtasks.exe
1456	schtasks.exe
2780	schtasks.exe
4772	schtasks.exe
5016	schtasks.exe
2104	schtasks.exe
3860	schtasks.exe
448	schtasks.exe
5072	schtasks.exe
436	schtasks.exe
2352	schtasks.exe
2164	schtasks.exe
1152	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
3152	mscontainer.exe
2568	unsecapp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3152	mscontainer.exe
Token: SeDebugPrivilege	2568	unsecapp.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 896 wrote to memory of 1392	896	DCRatBuild.exe	77
PID 896 wrote to memory of 1392	896	DCRatBuild.exe	77
PID 896 wrote to memory of 1392	896	DCRatBuild.exe	77
PID 1392 wrote to memory of 3920	1392	WScript.exe	78
PID 1392 wrote to memory of 3920	1392	WScript.exe	78
PID 1392 wrote to memory of 3920	1392	WScript.exe	78
PID 3920 wrote to memory of 3152	3920	cmd.exe	80
PID 3920 wrote to memory of 3152	3920	cmd.exe	80
PID 3152 wrote to memory of 2568	3152	mscontainer.exe	106
PID 3152 wrote to memory of 2568	3152	mscontainer.exe	106
PID 3920 wrote to memory of 4488	3920	cmd.exe	107
PID 3920 wrote to memory of 4488	3920	cmd.exe	107
PID 3920 wrote to memory of 4488	3920	cmd.exe	107

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:896
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontCrt\v4EBhvwDDus8dpGTc7sOOHNMF.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1392
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\FontCrt\8nndisOR96jQX.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3920
  - - C:\FontCrt\mscontainer.exe
      "C:\FontCrt\mscontainer.exe"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3152
    - - C:\FontCrt\unsecapp.exe
        
        "C:\FontCrt\unsecapp.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2568
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:4488

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 14 /tr "'C:\Users\Default User\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Users\Default User\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 10 /tr "'C:\FontCrt\unsecapp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\FontCrt\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3076

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 6 /tr "'C:\FontCrt\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Windows\System32\Hydrogen\BakedPlugins\Physics\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\Hydrogen\BakedPlugins\Physics\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:464

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\Windows\System32\Hydrogen\BakedPlugins\Physics\fontdrvhost.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 "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Users\Default User\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Default User\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1152

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Users\Public\Music\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Public\Music\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Music\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 7 /tr "'C:\FontCrt\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\FontCrt\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\FontCrt\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5072

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Oracle\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\All Users\Oracle\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Oracle\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5016

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\FontCrt\8nndisOR96jQX.bat

Filesize
140B

MD5
737a23a43a713bfbc620911d72b08568

SHA1
2d28cdd42b491dc5a71c263f4de89a9b267c3b2e

SHA256
cae33e20f4d512b20b7d8a8ced8ff2dbfecdd5af4bdf2cfa894e4392063ed7ac

SHA512
c07da131453f034e4d2350eaa2b66a14cece703f1f05f25460720fb866ba289d8ebfaf50b9252f644d8dae831b49bfb1fd700d00e2dd2e29ba534ce22d30c02e

Download Submit
C:\FontCrt\mscontainer.exe

Filesize
1.0MB

MD5
90a9b016691488e01001035d6e3c7332

SHA1
41c1ad2edb97e455fb1dd42af6aa42bccf2ca6e7

SHA256
ed8edc329949c6ef8d6ea189e07636bfb51d9153f3bbe25876ea6d2ce0437ba6

SHA512
f427654e3312e42368d8c3c4cf7060747e5cfea28b86712e7fcafc1645dcae82469db05b3d2f38346e34c9f668d35ea5ab6ef65a69862840eda31b6cd7a8c529

Download Submit
C:\FontCrt\v4EBhvwDDus8dpGTc7sOOHNMF.vbe

Filesize
197B

MD5
eebc6c035f2d4b3627375f3ff2d7a83b

SHA1
efd05b0496a20d6007002b94a187e868f3cf828f

SHA256
dedfb300ca692b2ae95643f1bbd7fb33253673d57991e9dedf47362b3a5741f4

SHA512
de4e387db50cae06ae408b7f9947c2413cdc9d94c663156c80f6b2151c66f9c530753969a744d62efe972cd00624bbb9b75a20b124276957b31138c5ba966be6

Download Submit
memory/3152-12-0x00007FFF338B3000-0x00007FFF338B5000-memory.dmp

Filesize
8KB

Download
memory/3152-13-0x0000000000A30000-0x0000000000B3C000-memory.dmp

Filesize
1.0MB

Download
memory/3152-14-0x000000001B6B0000-0x000000001B6C6000-memory.dmp

Filesize
88KB

Download
memory/3152-15-0x0000000002D80000-0x0000000002D8E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads