dcrat | eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eee

General

Target

eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Size

682KB
MD5

d2cc9996ea7c592421955075590e3c90
SHA1

ada5a6d86cf1e2465c4ea578733a7ccd68881f1a
SHA256

eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eee
SHA512

600a1f55756460832c5ebac60c88d55a2f256e41f797ac6f7e265f30ca1c03b7dc98b9567ef5c9bf9fd275af6f1a4af2b43fe084430f5875ab97faed6921fe9a
SSDEEP

12288:hqnO3mwJNoGFAgHCRvp1i/fjqJRYFInDrX/xTU3JgXDV6blx1wgtra7B:h+O3mwJnCRvEMxnDVSwgY

Score

10^/10

dcrat evasion infostealer persistence 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 5 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	3572	3688	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4008	3688	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1272	3688	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3404	3688	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3036	3688	schtasks.exe	82

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\PromptOnSecureDesktop = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	spoolsv.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3124-1-0x0000000000F90000-0x0000000001042000-memory.dmp	dcrat
behavioral2/files/0x0007000000023c8f-17.dat	dcrat
behavioral2/files/0x0008000000023c87-67.dat	dcrat
behavioral2/files/0x0009000000023c8a-78.dat	dcrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe

Executes dropped EXE 1 IoCs

pid	Process
2652	spoolsv.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\activeds\\RuntimeBroker.exe\""	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Windows\\DiagTrack\\Registry.exe\""	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\wlanui\\fontdrvhost.exe\""	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\winrs\\spoolsv.exe\""	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\PerfLogs\\explorer.exe\""	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe

Drops file in System32 directory 15 IoCs

description	ioc	Process
File created	C:\Windows\System32\wlanui\fontdrvhost.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\System32\activeds\RuntimeBroker.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\System32\activeds\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\wlanui\RCXB579.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\winrs\RCXB77F.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\activeds\RCXBCE3.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\System32\wlanui\5b884080fd4f94e2695da25c503f9e33b9605b83	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\System32\winrs\spoolsv.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\wlanui\RCXB57A.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\wlanui\fontdrvhost.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\System32\winrs\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\winrs\RCXB780.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\winrs\spoolsv.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\activeds\RCXBC74.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\System32\activeds\RuntimeBroker.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\DiagTrack\Registry.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\DiagTrack\Registry.exe	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File created	C:\Windows\DiagTrack\ee2ad38f3d43822fe0c92830b00d06adc71395d2	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\DiagTrack\RCXB373.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
File opened for modification	C:\Windows\DiagTrack\RCXB374.tmp	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3036	schtasks.exe
3572	schtasks.exe
4008	schtasks.exe
1272	schtasks.exe
3404	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3124	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
2652	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3124	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Token: SeDebugPrivilege	2652	spoolsv.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3124 wrote to memory of 1060	3124	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe	88
PID 3124 wrote to memory of 1060	3124	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe	88
PID 1060 wrote to memory of 4932	1060	cmd.exe	90
PID 1060 wrote to memory of 4932	1060	cmd.exe	90
PID 1060 wrote to memory of 2652	1060	cmd.exe	94
PID 1060 wrote to memory of 2652	1060	cmd.exe	94

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\PromptOnSecureDesktop = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	spoolsv.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\eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe
"C:\Users\Admin\AppData\Local\Temp\eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eeeN.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3124
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\mqk78Ud4Fy.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1060
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4932
- - C:\Windows\System32\winrs\spoolsv.exe
    "C:\Windows\System32\winrs\spoolsv.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:2652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Windows\DiagTrack\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\wlanui\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\winrs\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\PerfLogs\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\activeds\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3036

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\PerfLogs\explorer.exe

Filesize
682KB

MD5
4e3839d4f2b4acfac9cac5f39a506c12

SHA1
d2b211a9b3fb4700319b3f0486b9a3ee5a557a88

SHA256
bd57a6b59cbf99c0b89c5a38c3647362fe44fefab7db5e1fced4e47dbda7fc89

SHA512
350f2516cd5c182e3dc70dc1cca6e86383cf6178770255bee194e33b3cd81de04770f090900c09a6826badb88d575e43eafa2bb9c098906946629ca08e55a211

Download Submit
C:\Users\Admin\AppData\Local\Temp\mqk78Ud4Fy.bat

Filesize
201B

MD5
48b0cbcd97786342ee099b4e634121e2

SHA1
5726ddc668244940bab1a64ff300dd928697cb66

SHA256
61b772506a61c5d60c23e6349eeca1fff0af4914934ce138d8d4e07c03c07faa

SHA512
37b6db3b38b9be203548ae7d890d293a6de60a4f5b593a3bd4786647b0295fcbd7aaca41da89833cca4ebff1e0eca91bc21ae3b3d2bcdf6f823ed368ca569d00

Download Submit
C:\Windows\System32\activeds\RuntimeBroker.exe

Filesize
682KB

MD5
d2cc9996ea7c592421955075590e3c90

SHA1
ada5a6d86cf1e2465c4ea578733a7ccd68881f1a

SHA256
eba55f2c36d3cea42da3a04b815fcd59469bd8ec58acf4b5a660c8c972161eee

SHA512
600a1f55756460832c5ebac60c88d55a2f256e41f797ac6f7e265f30ca1c03b7dc98b9567ef5c9bf9fd275af6f1a4af2b43fe084430f5875ab97faed6921fe9a

Download Submit
C:\Windows\System32\activeds\RuntimeBroker.exe

Filesize
682KB

MD5
9f8dc1a751ba8adfcffd472184acd8f8

SHA1
1377f0c11c7056c21af3cc7c4a46d27c1cb1ae74

SHA256
5ade5ac940953ee21e468b57807fb41bd974d3a2d769c260f63c4aa50253387a

SHA512
d7f87eed3ff8fd9e79e28bc233a75085e37874967dddbf5c62731e5309ac4a42bbb92e4f8c8db6db810819167d2ea3fc129f6edcebd5434b0dc9eeb89a131bac

Download Submit
memory/3124-3-0x0000000001920000-0x000000000192C000-memory.dmp

Filesize
48KB

Download
memory/3124-4-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download
memory/3124-6-0x0000000001930000-0x000000000193A000-memory.dmp

Filesize
40KB

Download
memory/3124-7-0x0000000003200000-0x0000000003208000-memory.dmp

Filesize
32KB

Download
memory/3124-8-0x0000000003220000-0x000000000322C000-memory.dmp

Filesize
48KB

Download
memory/3124-5-0x00000000031F0000-0x00000000031FC000-memory.dmp

Filesize
48KB

Download
memory/3124-0-0x00007FFD0AF03000-0x00007FFD0AF05000-memory.dmp

Filesize
8KB

Download
memory/3124-2-0x0000000001910000-0x0000000001920000-memory.dmp

Filesize
64KB

Download
memory/3124-1-0x0000000000F90000-0x0000000001042000-memory.dmp

Filesize
712KB

Download
memory/3124-88-0x00007FFD0AF00000-0x00007FFD0B9C1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads