dcrat | 9c4b81fe156b9d9974e7296854a52e3c0bd9e6509e0d8a2161d7c611edaf1a4f

General

Target
{VKK+KODS}/vkk.exe
Size 653KB
Sample250101-ntp2qstmcx
SHA256 878683a67bb95a2a2917b57b9a737ae1f085fcb8950b212c3a28884abf9c1a34
MD5 91bd6c254ee87e5c67ec306277cd4aaa
SHA1 a7c343316582f0bbd25f23c6a082d0061f0e560b
SHA512 1159b53efc6bc16376504f87e4717ad630b094b3f33ae135409f27296ff2e2fc2e9f9aa21908c2789b7b094deafdbb247925a3691cb1a5bd1fc3a87fda9a7824
SSDEEP 12288:nRZ+IoG/n9IQxW3OBsegHibt32N7oqcLCf8VI3WYwSTdxjZQ:P2G/nvxW3Wu0t32VCk3WY1xju
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat discovery 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 21 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	2716	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2124	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2936	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2736	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2148	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2596	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2332	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2168	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2900	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	876	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1508	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2296	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2700	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2880	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3064	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1032	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2588	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2456	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2956	2860	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2496	2860	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x0007000000017472-9.dat	dcrat
behavioral3/memory/2240-13-0x0000000000340000-0x0000000000396000-memory.dmp	dcrat
behavioral3/memory/784-35-0x0000000000DF0000-0x0000000000E46000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2240	BridgeMsDll.exe
784	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
2516	cmd.exe
2516	cmd.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Mozilla Firefox\defaults\pref\winlogon.exe	BridgeMsDll.exe
File created	C:\Program Files\Mozilla Firefox\defaults\pref\cc11b995f2a76d	BridgeMsDll.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\088424020bedd6	BridgeMsDll.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Documentation\wininit.exe	BridgeMsDll.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Documentation\56085415360792	BridgeMsDll.exe
File created	C:\Program Files\Mozilla Firefox\defaults\pref\winlogon.exe	BridgeMsDll.exe
File created	C:\Program Files\Java\WmiPrvSE.exe	BridgeMsDll.exe
File created	C:\Program Files\Java\24dbde2999530e	BridgeMsDll.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\conhost.exe	BridgeMsDll.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 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	vkk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2880	schtasks.exe
2588	schtasks.exe
2456	schtasks.exe
2700	schtasks.exe
2168	schtasks.exe
2900	schtasks.exe
876	schtasks.exe
1032	schtasks.exe
2124	schtasks.exe
2736	schtasks.exe
2596	schtasks.exe
2956	schtasks.exe
2716	schtasks.exe
2148	schtasks.exe
2720	schtasks.exe
2332	schtasks.exe
1508	schtasks.exe
2296	schtasks.exe
3064	schtasks.exe
2496	schtasks.exe
2936	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2240	BridgeMsDll.exe
2240	BridgeMsDll.exe
2240	BridgeMsDll.exe
784	cmd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2240	BridgeMsDll.exe
Token: SeDebugPrivilege	784	cmd.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2108 wrote to memory of 2092	2108	vkk.exe	30
PID 2108 wrote to memory of 2092	2108	vkk.exe	30
PID 2108 wrote to memory of 2092	2108	vkk.exe	30
PID 2108 wrote to memory of 2092	2108	vkk.exe	30
PID 2092 wrote to memory of 2516	2092	WScript.exe	31
PID 2092 wrote to memory of 2516	2092	WScript.exe	31
PID 2092 wrote to memory of 2516	2092	WScript.exe	31
PID 2092 wrote to memory of 2516	2092	WScript.exe	31
PID 2516 wrote to memory of 2240	2516	cmd.exe	33
PID 2516 wrote to memory of 2240	2516	cmd.exe	33
PID 2516 wrote to memory of 2240	2516	cmd.exe	33
PID 2516 wrote to memory of 2240	2516	cmd.exe	33
PID 2240 wrote to memory of 2528	2240	BridgeMsDll.exe	56
PID 2240 wrote to memory of 2528	2240	BridgeMsDll.exe	56
PID 2240 wrote to memory of 2528	2240	BridgeMsDll.exe	56
PID 2528 wrote to memory of 1572	2528	cmd.exe	58
PID 2528 wrote to memory of 1572	2528	cmd.exe	58
PID 2528 wrote to memory of 1572	2528	cmd.exe	58
PID 2528 wrote to memory of 784	2528	cmd.exe	59
PID 2528 wrote to memory of 784	2528	cmd.exe	59
PID 2528 wrote to memory of 784	2528	cmd.exe	59

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\{VKK+KODS}\vkk.exe
"C:\Users\Admin\AppData\Local\Temp\{VKK+KODS}\vkk.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2108
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Combrowser\Fcaxb7I9ITZe2hUWU.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2092
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Combrowser\10l79m1i778n.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2516
  - - C:\Combrowser\BridgeMsDll.exe
      "C:\Combrowser\BridgeMsDll.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2240
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\hs0sn2L6wi.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2528
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1572
      - C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\cmd.exe
        
        "C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\cmd.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Program Files\Mozilla Firefox\defaults\pref\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\defaults\pref\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Program Files\Mozilla Firefox\defaults\pref\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Combrowser\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Combrowser\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Combrowser\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\Program Files\Java\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Java\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 8 /tr "'C:\Program Files\Java\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 7 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\cmd.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 "cmdc" /sc MINUTE /mo 9 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\Combrowser\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Combrowser\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 12 /tr "'C:\Combrowser\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2588

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Documentation\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Documentation\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Documentation\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2496

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

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

10l79m1i778n.bat

Path C:\Combrowser\10l79m1i778n.bat
Size 31B
SHA256 0ef204e2c7f3c6d5ace003c6864db74cc2f085543409a3366af99a5f45823933
MD5 e229e6475655dbf48debe39ea7e4c0d0
SHA1 835a9dc7bd837e6096df8d97dff90ab88e656a41
SHA512 6aa3ae4bf881de134b54ca4e5f813ed380645091a51762046b41d47e56318a3970a5b4158d302fc887e0ccff41304050364acde8fcf0e126721e0eea1bc42b27
MD5 SHA1 SHA512

Submit Download

Fcaxb7I9ITZe2hUWU.vbe

Path C:\Combrowser\Fcaxb7I9ITZe2hUWU.vbe
Size 199B
SHA256 cb4216925fc61c39e18644995303fc6b6eedd4154ce6b10a6e42a71db8170101
MD5 75cec359961d378447f24b18efadc0c5
SHA1 9fec81fc93c8d8b17a4070057ec8e68da824c14d
SHA512 1f0f57c0a11485c656c49d8b897e101660775e8cd7c35c2cb302dabc9bd9024bfd173d7a938f733b12d30636715238325ea6fa4955e344822c512ff4ab030597
MD5 SHA1 SHA512

Submit Download

hs0sn2L6wi.bat

Path C:\Users\Admin\AppData\Local\Temp\hs0sn2L6wi.bat
Size 221B
SHA256 ee4d32479e1b4e0c7f21f745d0900188e005999764c494c7eadaef913ddb8849
MD5 94f289ee10539f72841b2121e36b64a6
SHA1 3472db6a6f0959232487264a7029c942976d638d
SHA512 3229ca677994de9044a21c4afac623e61d3a8e5738ad605a7500d26edc4ac93f433c7e1a8bec090dba580a7d121842c84e114fa00376b60cb8c150157aef37ca
MD5 SHA1 SHA512

Submit Download

BridgeMsDll.exe

Path \Combrowser\BridgeMsDll.exe
Size 315KB
SHA256 ea420c16fb24ec295eca3c796d735a758bdc00071d233ff73ee841d56b4b004a
MD5 57566762e7d37fdeae9c4740f16f1b75
SHA1 e6d5a1055d1064569977dc54f5ba162348e2bebb
SHA512 0d94f11242de7f01804e9e35fd5f422be6bcc62a292d900aa708b01c74472e2bee20dfc682786c88dd26d97614d00b2fc5106b7557d4eff090487ca7032f8783
SSDEEP 6144:hVYy2oo7KUEZ08R5LCfSWIs5sVIO7xMW2D0770w5/45Jdxfbvr9u:h32N7oqcLCf8VI3WYwSTdxjZ
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/784-35-0x0000000000DF0000-0x0000000000E46000-memory.dmp

Download

memory/2240-13-0x0000000000340000-0x0000000000396000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads