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 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1296	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3048	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2320	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2336	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3008	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2408	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2160	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2200	2532	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2828	2532	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral3/files/0x0006000000018781-9.dat	dcrat
behavioral3/memory/2780-13-0x0000000000120000-0x0000000000176000-memory.dmp	dcrat
behavioral3/memory/568-27-0x00000000003C0000-0x0000000000416000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

Processes:

BridgeMsDll.exeexplorer.exe

pid	Process
2780	BridgeMsDll.exe
568	explorer.exe

Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid	Process
2192	cmd.exe
2192	cmd.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

Processes:

vkk.exeWScript.execmd.exe

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 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
2336	schtasks.exe
3008	schtasks.exe
2160	schtasks.exe
1296	schtasks.exe
3048	schtasks.exe
2200	schtasks.exe
2828	schtasks.exe
2320	schtasks.exe
2408	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

BridgeMsDll.exeexplorer.exe

pid	Process
2780	BridgeMsDll.exe
568	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

BridgeMsDll.exeexplorer.exe

description	pid	Process
Token: SeDebugPrivilege	2780	BridgeMsDll.exe
Token: SeDebugPrivilege	568	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

vkk.exeWScript.execmd.exeBridgeMsDll.execmd.exe

description	pid	Process	procid_target
PID 1964 wrote to memory of 2748	1964	vkk.exe	30
PID 1964 wrote to memory of 2748	1964	vkk.exe	30
PID 1964 wrote to memory of 2748	1964	vkk.exe	30
PID 1964 wrote to memory of 2748	1964	vkk.exe	30
PID 2748 wrote to memory of 2192	2748	WScript.exe	31
PID 2748 wrote to memory of 2192	2748	WScript.exe	31
PID 2748 wrote to memory of 2192	2748	WScript.exe	31
PID 2748 wrote to memory of 2192	2748	WScript.exe	31
PID 2192 wrote to memory of 2780	2192	cmd.exe	33
PID 2192 wrote to memory of 2780	2192	cmd.exe	33
PID 2192 wrote to memory of 2780	2192	cmd.exe	33
PID 2192 wrote to memory of 2780	2192	cmd.exe	33
PID 2780 wrote to memory of 1676	2780	BridgeMsDll.exe	44
PID 2780 wrote to memory of 1676	2780	BridgeMsDll.exe	44
PID 2780 wrote to memory of 1676	2780	BridgeMsDll.exe	44
PID 1676 wrote to memory of 1660	1676	cmd.exe	46
PID 1676 wrote to memory of 1660	1676	cmd.exe	46
PID 1676 wrote to memory of 1660	1676	cmd.exe	46
PID 1676 wrote to memory of 568	1676	cmd.exe	47
PID 1676 wrote to memory of 568	1676	cmd.exe	47
PID 1676 wrote to memory of 568	1676	cmd.exe	47

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:1964
- 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:2748
- - 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:2192
  - - C:\Combrowser\BridgeMsDll.exe
      "C:\Combrowser\BridgeMsDll.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2780
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\bWVTs9gqPV.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1676
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1660
      - C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\explorer.exe
        
        "C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\explorer.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3048

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2408

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2200

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 7 /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2828

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\Fcaxb7I9ITZe2hUWU.vbe

Filesize
199B

MD5
75cec359961d378447f24b18efadc0c5

SHA1
9fec81fc93c8d8b17a4070057ec8e68da824c14d

SHA256
cb4216925fc61c39e18644995303fc6b6eedd4154ce6b10a6e42a71db8170101

SHA512
1f0f57c0a11485c656c49d8b897e101660775e8cd7c35c2cb302dabc9bd9024bfd173d7a938f733b12d30636715238325ea6fa4955e344822c512ff4ab030597

Download Submit
C:\Users\Admin\AppData\Local\Temp\bWVTs9gqPV.bat

Filesize
226B

MD5
babc9bc43ecb2fb9cc4df181787979f5

SHA1
e36f62e1d59891e696ea3c7cc81c59901892a9fb

SHA256
f15abd121d1ca6e05b3738f990b0355fff833ae25e5712084613d71a86e9a9fb

SHA512
8b86f4df6bc2afbf7397b6be3f82885dc45b78d2ce1c5ee59e5b9f6f73b251e4d06fb7676d9c80f566da29aff3a106eaf54843efd47897aa0f6329308be13074

Download Submit
\Combrowser\BridgeMsDll.exe

Filesize
315KB

MD5
57566762e7d37fdeae9c4740f16f1b75

SHA1
e6d5a1055d1064569977dc54f5ba162348e2bebb

SHA256
ea420c16fb24ec295eca3c796d735a758bdc00071d233ff73ee841d56b4b004a

SHA512
0d94f11242de7f01804e9e35fd5f422be6bcc62a292d900aa708b01c74472e2bee20dfc682786c88dd26d97614d00b2fc5106b7557d4eff090487ca7032f8783

Download Submit
memory/568-27-0x00000000003C0000-0x0000000000416000-memory.dmp

Filesize
344KB

Download
memory/2780-13-0x0000000000120000-0x0000000000176000-memory.dmp

Filesize
344KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads