dcrat | 13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3

General

Target

13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Size

2.7MB
MD5

f9b06779ef8886e3db38dd8edf2c8ae7
SHA1

87c11d3f703d6690f5e6aefa5ddabd0eccdb2c43
SHA256

13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3
SHA512

e7191e615d4fe09136ff49f6e33cc219da7c3421259bc1f648e59e1cfc9c9d93970cb68dd6d8af072ad93867e14d71aa54e41c70d91d31a49b09dbb497d1a5b0
SSDEEP

49152:EGBMeNyllOBdHoYMPRdpOIzP1hu8yPhynpFkn1bkrfWv1LW35IS8CD+isjlQ:BMB7gJUfJ9hcPIpFqtkTWv1w5IgWi

Score

10^/10

dcrat evasion infostealer rat trojan

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.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2688	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3040	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	656	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1952	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2912	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2124	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2336	2680	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1096	2680	schtasks.exe	30

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.exe

DCRat payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2828-1-0x0000000000D00000-0x0000000000FB4000-memory.dmp	dcrat
behavioral1/files/0x0063000000011c27-33.dat	dcrat
behavioral1/files/0x000700000001a345-54.dat	dcrat
behavioral1/files/0x000500000001a42b-62.dat	dcrat
behavioral1/memory/944-75-0x0000000001160000-0x0000000001414000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
944	explorer.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\DigitalLocker\dwm.exe	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
File opened for modification	C:\Windows\DigitalLocker\dwm.exe	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
File created	C:\Windows\DigitalLocker\6cb0b6c459d5d3	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
File opened for modification	C:\Windows\DigitalLocker\RCX5AE.tmp	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
File opened for modification	C:\Windows\DigitalLocker\RCX5CE.tmp	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe

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

System Information Discovery
T1082

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

pid	Process
1952	schtasks.exe
2124	schtasks.exe
2336	schtasks.exe
1096	schtasks.exe
3040	schtasks.exe
2688	schtasks.exe
656	schtasks.exe
2912	schtasks.exe
2600	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2828	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
944	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2828	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Token: SeDebugPrivilege	944	explorer.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 2668	2828	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe	40
PID 2828 wrote to memory of 2668	2828	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe	40
PID 2828 wrote to memory of 2668	2828	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe	40
PID 2668 wrote to memory of 2056	2668	cmd.exe	42
PID 2668 wrote to memory of 2056	2668	cmd.exe	42
PID 2668 wrote to memory of 2056	2668	cmd.exe	42
PID 2668 wrote to memory of 944	2668	cmd.exe	43
PID 2668 wrote to memory of 944	2668	cmd.exe	43
PID 2668 wrote to memory of 944	2668	cmd.exe	43

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	explorer.exe

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\13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe
"C:\Users\Admin\AppData\Local\Temp\13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3.exe"
1⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2828
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\BFCa50jXuL.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2668
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2056
- - C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe
    "C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Windows\DigitalLocker\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\DigitalLocker\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\Windows\DigitalLocker\dwm.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 "csrssc" /sc MINUTE /mo 6 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1096

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

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\RCXA45.tmp

Filesize
2.7MB

MD5
517f3b5f3a0d7fe45cdd3a481f0adf5e

SHA1
c1899cdbb7b8dd0a7501fb3418a46ea16a90b095

SHA256
241f3ca50e745d16b297fd3a83adb2b47eca06ca6206f26f7ed8306a148cc825

SHA512
de68dc2b143ca0c178ca75defaa0bdcb039664ec962105cb352d4f4bbb65a2c721d155c84d88daf267a4ebc87c1576c8ae08013130d861fc23dc20f90eabe90a

Download Submit
C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\csrss.exe

Filesize
2.7MB

MD5
b197765eb5f03fac8ab5c7c2178a20e1

SHA1
cb3cad74d51b8fadc7eefe70e2418fb747494e08

SHA256
fb7d2f1d40beb5384c96c273b35d35ce3ccf9661de07fee6292ee406cf6acbf2

SHA512
5c13147cc1312426fe9558a8d24274aa47c7afbde9ed61976a927628787ef1f6af5b0fa88e108bb66a66421440c8113a305097b1ea45518f740111fc10ddf298

Download Submit
C:\Users\Admin\AppData\Local\Temp\BFCa50jXuL.bat

Filesize
226B

MD5
44c7e79cbc25c544f07ecd9a112ad91c

SHA1
fb83c00d8f5602ec0a5cdce34c3157d4e72b5b31

SHA256
252ba8156a171b195bd674cdf87501335d10f93231fe75119dea72fbab7b6681

SHA512
518a777496befd6e86f1902940fc8f9b0093882c28db585afe17bfc686183c0141fcc6c979a7fd38e09f55f513c302759ac70793e7502e815c4634c1de952b03

Download Submit
C:\Windows\DigitalLocker\dwm.exe

Filesize
2.7MB

MD5
f9b06779ef8886e3db38dd8edf2c8ae7

SHA1
87c11d3f703d6690f5e6aefa5ddabd0eccdb2c43

SHA256
13f24a33b0bda605948ee337aac9f7095faeb536a0c1ba8d221a53af3822eec3

SHA512
e7191e615d4fe09136ff49f6e33cc219da7c3421259bc1f648e59e1cfc9c9d93970cb68dd6d8af072ad93867e14d71aa54e41c70d91d31a49b09dbb497d1a5b0

Download Submit
memory/944-76-0x0000000000B10000-0x0000000000B66000-memory.dmp

Filesize
344KB

Download
memory/944-77-0x0000000000B60000-0x0000000000B72000-memory.dmp

Filesize
72KB

Download
memory/944-75-0x0000000001160000-0x0000000001414000-memory.dmp

Filesize
2.7MB

Download
memory/2828-8-0x0000000000440000-0x0000000000448000-memory.dmp

Filesize
32KB

Download
memory/2828-18-0x0000000000CE0000-0x0000000000CEA000-memory.dmp

Filesize
40KB

Download
memory/2828-9-0x00000000005E0000-0x00000000005EA000-memory.dmp

Filesize
40KB

Download
memory/2828-10-0x0000000000B20000-0x0000000000B76000-memory.dmp

Filesize
344KB

Download
memory/2828-11-0x00000000005D0000-0x00000000005D8000-memory.dmp

Filesize
32KB

Download
memory/2828-12-0x00000000005F0000-0x0000000000602000-memory.dmp

Filesize
72KB

Download
memory/2828-13-0x0000000000C90000-0x0000000000C98000-memory.dmp

Filesize
32KB

Download
memory/2828-14-0x0000000000CA0000-0x0000000000CA8000-memory.dmp

Filesize
32KB

Download
memory/2828-15-0x0000000000CB0000-0x0000000000CBC000-memory.dmp

Filesize
48KB

Download
memory/2828-16-0x0000000000CC0000-0x0000000000CCE000-memory.dmp

Filesize
56KB

Download
memory/2828-17-0x0000000000CD0000-0x0000000000CDC000-memory.dmp

Filesize
48KB

Download
memory/2828-7-0x0000000000420000-0x0000000000436000-memory.dmp

Filesize
88KB

Download
memory/2828-19-0x0000000000CF0000-0x0000000000CFC000-memory.dmp

Filesize
48KB

Download
memory/2828-0-0x000007FEF66F3000-0x000007FEF66F4000-memory.dmp

Filesize
4KB

Download
memory/2828-6-0x0000000000410000-0x0000000000420000-memory.dmp

Filesize
64KB

Download
memory/2828-5-0x0000000000400000-0x0000000000408000-memory.dmp

Filesize
32KB

Download
memory/2828-71-0x000007FEF66F0000-0x000007FEF70DC000-memory.dmp

Filesize
9.9MB

Download
memory/2828-4-0x00000000002D0000-0x00000000002EC000-memory.dmp

Filesize
112KB

Download
memory/2828-3-0x00000000002C0000-0x00000000002CE000-memory.dmp

Filesize
56KB

Download
memory/2828-2-0x000007FEF66F0000-0x000007FEF70DC000-memory.dmp

Filesize
9.9MB

Download
memory/2828-1-0x0000000000D00000-0x0000000000FB4000-memory.dmp

Filesize
2.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads