dcrat | 9cf6cd197d923c4806912e9c5ef08e3c2c50fb4b20d4ab8b15590a88b73f296b

Analysis

max time kernel
119s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-12-2024 16:05

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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 27 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	2872	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2788	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2548	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2652	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2612	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3020	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3024	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1244	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2424	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1744	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1724	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2120	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2516	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2140	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1028	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1184	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	760	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2552	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2684	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2436	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	680	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	896	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1464	2848	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1788	2848	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x0007000000016cc5-9.dat	dcrat
behavioral3/memory/2736-13-0x0000000001290000-0x00000000012E6000-memory.dmp	dcrat
behavioral3/memory/2580-38-0x00000000003A0000-0x00000000003F6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2736	BridgeMsDll.exe
2580	sppsvc.exe

Loads dropped DLL 2 IoCs

pid	Process
2308	cmd.exe
2308	cmd.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe	BridgeMsDll.exe
File created	C:\Program Files (x86)\Windows Photo Viewer\de-DE\0a1fd5f707cd16	BridgeMsDll.exe
File created	C:\Program Files\Windows Defender\en-US\BridgeMsDll.exe	BridgeMsDll.exe
File created	C:\Program Files\Windows Defender\en-US\719767dc400ffa	BridgeMsDll.exe
File created	C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe	BridgeMsDll.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\IME\ja-JP\System.exe	BridgeMsDll.exe
File created	C:\Windows\IME\ja-JP\27d1bcfc3c54e0	BridgeMsDll.exe
File created	C:\Windows\Prefetch\ReadyBoot\System.exe	BridgeMsDll.exe
File created	C:\Windows\Prefetch\ReadyBoot\27d1bcfc3c54e0	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vkk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 27 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3020	schtasks.exe
2684	schtasks.exe
896	schtasks.exe
2788	schtasks.exe
1744	schtasks.exe
2140	schtasks.exe
1464	schtasks.exe
2612	schtasks.exe
1244	schtasks.exe
1028	schtasks.exe
680	schtasks.exe
1724	schtasks.exe
2516	schtasks.exe
2120	schtasks.exe
3024	schtasks.exe
2660	schtasks.exe
1184	schtasks.exe
760	schtasks.exe
1788	schtasks.exe
2548	schtasks.exe
2652	schtasks.exe
2508	schtasks.exe
1504	schtasks.exe
2552	schtasks.exe
2436	schtasks.exe
2872	schtasks.exe
2424	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2736	BridgeMsDll.exe
2580	sppsvc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2736	BridgeMsDll.exe
Token: SeDebugPrivilege	2580	sppsvc.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2052 wrote to memory of 2988	2052	vkk.exe	30
PID 2052 wrote to memory of 2988	2052	vkk.exe	30
PID 2052 wrote to memory of 2988	2052	vkk.exe	30
PID 2052 wrote to memory of 2988	2052	vkk.exe	30
PID 2988 wrote to memory of 2308	2988	WScript.exe	32
PID 2988 wrote to memory of 2308	2988	WScript.exe	32
PID 2988 wrote to memory of 2308	2988	WScript.exe	32
PID 2988 wrote to memory of 2308	2988	WScript.exe	32
PID 2308 wrote to memory of 2736	2308	cmd.exe	34
PID 2308 wrote to memory of 2736	2308	cmd.exe	34
PID 2308 wrote to memory of 2736	2308	cmd.exe	34
PID 2308 wrote to memory of 2736	2308	cmd.exe	34
PID 2736 wrote to memory of 2580	2736	BridgeMsDll.exe	63
PID 2736 wrote to memory of 2580	2736	BridgeMsDll.exe	63
PID 2736 wrote to memory of 2580	2736	BridgeMsDll.exe	63
PID 2736 wrote to memory of 2580	2736	BridgeMsDll.exe	63
PID 2736 wrote to memory of 2580	2736	BridgeMsDll.exe	63

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:2052
- 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:2988
- - 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:2308
  - - C:\Combrowser\BridgeMsDll.exe
      "C:\Combrowser\BridgeMsDll.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2736
    - - C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe
        
        "C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2580

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Photo Viewer\de-DE\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Users\Admin\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2652

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

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Users\Default\Saved Games\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default\Saved Games\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Users\Default\Saved Games\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Windows\IME\ja-JP\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\IME\ja-JP\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Windows\IME\ja-JP\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2516

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2140

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BridgeMsDllB" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Defender\en-US\BridgeMsDll.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1184

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BridgeMsDll" /sc ONLOGON /tr "'C:\Program Files\Windows Defender\en-US\BridgeMsDll.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BridgeMsDllB" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Defender\en-US\BridgeMsDll.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAPW" /sc MINUTE /mo 11 /tr "'C:\Users\Admin\PrintHood\WMIADAP.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAP" /sc ONLOGON /tr "'C:\Users\Admin\PrintHood\WMIADAP.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAPW" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\PrintHood\WMIADAP.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Windows\Prefetch\ReadyBoot\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:896

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\Prefetch\ReadyBoot\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1464

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Windows\Prefetch\ReadyBoot\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1788

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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
\Combrowser\BridgeMsDll.exe

Filesize
315KB

MD5
57566762e7d37fdeae9c4740f16f1b75

SHA1
e6d5a1055d1064569977dc54f5ba162348e2bebb

SHA256
ea420c16fb24ec295eca3c796d735a758bdc00071d233ff73ee841d56b4b004a

SHA512
0d94f11242de7f01804e9e35fd5f422be6bcc62a292d900aa708b01c74472e2bee20dfc682786c88dd26d97614d00b2fc5106b7557d4eff090487ca7032f8783

Download Submit
memory/2580-38-0x00000000003A0000-0x00000000003F6000-memory.dmp

Filesize
344KB

Download
memory/2736-13-0x0000000001290000-0x00000000012E6000-memory.dmp

Filesize
344KB

Download