dcrat | 61cbb21bcc559a88d2e8365d6a2abb738faf56acd0e0b2f259235621d14fd71b

General

Target

{VKK+KODS}/vkk.exe
Size

653KB
MD5

91bd6c254ee87e5c67ec306277cd4aaa
SHA1

a7c343316582f0bbd25f23c6a082d0061f0e560b
SHA256

878683a67bb95a2a2917b57b9a737ae1f085fcb8950b212c3a28884abf9c1a34
SHA512

1159b53efc6bc16376504f87e4717ad630b094b3f33ae135409f27296ff2e2fc2e9f9aa21908c2789b7b094deafdbb247925a3691cb1a5bd1fc3a87fda9a7824
SSDEEP

12288:nRZ+IoG/n9IQxW3OBsegHibt32N7oqcLCf8VI3WYwSTdxjZQ:P2G/nvxW3Wu0t32VCk3WY1xju

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 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	2828	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2472	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2948	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2864	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2748	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2704	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1252	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2768	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2104	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	748	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2012	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3052	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	688	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2764	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3040	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3036	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	560	2852	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	776	2852	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x0007000000015ec4-12.dat	dcrat
behavioral3/memory/2468-13-0x0000000000A20000-0x0000000000A76000-memory.dmp	dcrat
behavioral3/memory/2552-33-0x0000000000320000-0x0000000000376000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2468	BridgeMsDll.exe
2552	winlogon.exe

Loads dropped DLL 2 IoCs

pid	Process
2484	cmd.exe
2484	cmd.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Defender\es-ES\cc11b995f2a76d	BridgeMsDll.exe
File created	C:\Program Files (x86)\Windows Media Player\ja-JP\wininit.exe	BridgeMsDll.exe
File opened for modification	C:\Program Files (x86)\Windows Media Player\ja-JP\wininit.exe	BridgeMsDll.exe
File created	C:\Program Files (x86)\Windows Media Player\ja-JP\56085415360792	BridgeMsDll.exe
File created	C:\Program Files (x86)\Windows Defender\es-ES\winlogon.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 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2828	schtasks.exe
2948	schtasks.exe
3040	schtasks.exe
560	schtasks.exe
776	schtasks.exe
2864	schtasks.exe
3052	schtasks.exe
2764	schtasks.exe
3036	schtasks.exe
748	schtasks.exe
2472	schtasks.exe
2704	schtasks.exe
2768	schtasks.exe
2104	schtasks.exe
2748	schtasks.exe
1252	schtasks.exe
2012	schtasks.exe
688	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2468	BridgeMsDll.exe
2468	BridgeMsDll.exe
2468	BridgeMsDll.exe
2552	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2468	BridgeMsDll.exe
Token: SeDebugPrivilege	2552	winlogon.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1372 wrote to memory of 2308	1372	vkk.exe	30
PID 1372 wrote to memory of 2308	1372	vkk.exe	30
PID 1372 wrote to memory of 2308	1372	vkk.exe	30
PID 1372 wrote to memory of 2308	1372	vkk.exe	30
PID 2308 wrote to memory of 2484	2308	WScript.exe	31
PID 2308 wrote to memory of 2484	2308	WScript.exe	31
PID 2308 wrote to memory of 2484	2308	WScript.exe	31
PID 2308 wrote to memory of 2484	2308	WScript.exe	31
PID 2484 wrote to memory of 2468	2484	cmd.exe	33
PID 2484 wrote to memory of 2468	2484	cmd.exe	33
PID 2484 wrote to memory of 2468	2484	cmd.exe	33
PID 2484 wrote to memory of 2468	2484	cmd.exe	33
PID 2468 wrote to memory of 1516	2468	BridgeMsDll.exe	53
PID 2468 wrote to memory of 1516	2468	BridgeMsDll.exe	53
PID 2468 wrote to memory of 1516	2468	BridgeMsDll.exe	53
PID 1516 wrote to memory of 1456	1516	cmd.exe	55
PID 1516 wrote to memory of 1456	1516	cmd.exe	55
PID 1516 wrote to memory of 1456	1516	cmd.exe	55
PID 1516 wrote to memory of 2552	1516	cmd.exe	57
PID 1516 wrote to memory of 2552	1516	cmd.exe	57
PID 1516 wrote to memory of 2552	1516	cmd.exe	57

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:1372
- 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:2308
- - 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:2484
  - - 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:2468
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\6AeBC68ZhB.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1516
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1456
      - C:\Program Files (x86)\Windows Defender\es-ES\winlogon.exe
        
        "C:\Program Files (x86)\Windows Defender\es-ES\winlogon.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Media Player\ja-JP\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\ja-JP\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2472

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Media Player\ja-JP\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\Users\Public\Recorded TV\Sample Media\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Users\Public\Recorded TV\Sample Media\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 5 /tr "'C:\Users\Public\Recorded TV\Sample Media\taskhost.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 "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Defender\es-ES\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\es-ES\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Defender\es-ES\winlogon.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 "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\Combrowser\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:748

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:2012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 5 /tr "'C:\Combrowser\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 5 /tr "'C:\Recovery\480d7142-91a3-11ef-b9f6-6e5a89f5a3c7\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Recovery\480d7142-91a3-11ef-b9f6-6e5a89f5a3c7\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 9 /tr "'C:\Recovery\480d7142-91a3-11ef-b9f6-6e5a89f5a3c7\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:776

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

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Downloads

C:\Combrowser\10l79m1i778n.bat

Filesize
31B

MD5
e229e6475655dbf48debe39ea7e4c0d0

SHA1
835a9dc7bd837e6096df8d97dff90ab88e656a41

SHA256
0ef204e2c7f3c6d5ace003c6864db74cc2f085543409a3366af99a5f45823933

SHA512
6aa3ae4bf881de134b54ca4e5f813ed380645091a51762046b41d47e56318a3970a5b4158d302fc887e0ccff41304050364acde8fcf0e126721e0eea1bc42b27

Download Submit
C:\Combrowser\BridgeMsDll.exe

Filesize
315KB

MD5
57566762e7d37fdeae9c4740f16f1b75

SHA1
e6d5a1055d1064569977dc54f5ba162348e2bebb

SHA256
ea420c16fb24ec295eca3c796d735a758bdc00071d233ff73ee841d56b4b004a

SHA512
0d94f11242de7f01804e9e35fd5f422be6bcc62a292d900aa708b01c74472e2bee20dfc682786c88dd26d97614d00b2fc5106b7557d4eff090487ca7032f8783

Download Submit
C:\Combrowser\Fcaxb7I9ITZe2hUWU.vbe

Filesize
199B

MD5
75cec359961d378447f24b18efadc0c5

SHA1
9fec81fc93c8d8b17a4070057ec8e68da824c14d

SHA256
cb4216925fc61c39e18644995303fc6b6eedd4154ce6b10a6e42a71db8170101

SHA512
1f0f57c0a11485c656c49d8b897e101660775e8cd7c35c2cb302dabc9bd9024bfd173d7a938f733b12d30636715238325ea6fa4955e344822c512ff4ab030597

Download Submit
C:\Users\Admin\AppData\Local\Temp\6AeBC68ZhB.bat

Filesize
223B

MD5
377f0a2d3fae89a200eb39228540b1c6

SHA1
503a0436d1e139638f31d84c0b3997f1f0e72224

SHA256
6bf85f37a9292dd59b715d6ee9c00315854e4ed421142cb3eeb0239c11b95bf0

SHA512
89044b65cedeab21b656d8f73b8dba851408a377ce7511377ae290b695b718ebc561f6754bc984e541387d7197ee37170ecfb8ce2c577d40a6f83aab9993cc39

Download Submit
memory/2468-13-0x0000000000A20000-0x0000000000A76000-memory.dmp

Filesize
344KB

Download
memory/2552-33-0x0000000000320000-0x0000000000376000-memory.dmp

Filesize
344KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads