dcrat | 05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1

General

Target

05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Size

1.8MB
MD5

5d232371c6b04bf6e609ee14fc06f3f6
SHA1

d6b7e0e98b0bd964ce6b2256f7c3f52ea2ec39ba
SHA256

05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1
SHA512

18b7ae05853bbe0109b3f00861b97951a7963036bbe021b3a2ae178c810257033e249613e522c3a4c16ceaa415f3358b8a052c28f321c6128228f38367991cc6
SSDEEP

49152:DT+08U5LLZTm94oY5RMRyAhpXDQt1UJo:DT8EL4I5EfG

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	1220	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1416	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3648	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4752	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4336	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	524	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1604	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4920	400	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4488	400	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\EnableLUA = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	RuntimeBroker.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1952-1-0x0000000000CC0000-0x0000000000E8C000-memory.dmp	dcrat
behavioral2/files/0x000b000000023b62-26.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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe

Executes dropped EXE 1 IoCs

pid	Process
3012	RuntimeBroker.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"	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RuntimeBroker.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
File created	C:\Program Files\Java\jdk-1.8\lib\9e8d7a4ca61bd9	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\tracing\OfficeClickToRun.exe	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
File created	C:\Windows\tracing\e6c9b481da804f	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
File created	C:\Windows\addins\RuntimeBroker.exe	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
File created	C:\Windows\addins\9e8d7a4ca61bd9	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
File created	C:\Windows\tracing\OfficeClickToRun.exe	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.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-1-5-21-3227495264-2217614367-4027411560-1000_Classes\Local Settings	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.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

pid	Process
4920	schtasks.exe
4488	schtasks.exe
1220	schtasks.exe
1416	schtasks.exe
4752	schtasks.exe
4336	schtasks.exe
1604	schtasks.exe
3648	schtasks.exe
524	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
3012	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Token: SeDebugPrivilege	3012	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1952 wrote to memory of 2300	1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe	92
PID 1952 wrote to memory of 2300	1952	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe	92
PID 2300 wrote to memory of 112	2300	cmd.exe	94
PID 2300 wrote to memory of 112	2300	cmd.exe	94
PID 2300 wrote to memory of 3012	2300	cmd.exe	95
PID 2300 wrote to memory of 3012	2300	cmd.exe	95

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"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.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\05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe
"C:\Users\Admin\AppData\Local\Temp\05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1952
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\YHzujnjJdX.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2300
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:112
- - C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe
    "C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:3012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 8 /tr "'C:\Windows\tracing\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\tracing\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\Windows\tracing\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Program Files\Java\jdk-1.8\lib\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:524

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Windows\addins\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\addins\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Windows\addins\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4488

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

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\YHzujnjJdX.bat

Filesize
216B

MD5
c3cee006f04ced272e358e677b242cda

SHA1
ceb426dfc6b82c682b09cc36f4f36ab682a2f91e

SHA256
18c13e1593ec3f55d65dea8c082cebd7156597dcd38f2127e7a152f25a8696ff

SHA512
dfe80e5f56c9325637cc7d68f3c4ed1da4d5cc086d11c993c79099b680cfe9af5d6054553e510fd248a65e3bc2c500fdf9b81d92e4480d6c1ede33b92fad4ff4

Download Submit
C:\Windows\tracing\OfficeClickToRun.exe

Filesize
1.8MB

MD5
5d232371c6b04bf6e609ee14fc06f3f6

SHA1
d6b7e0e98b0bd964ce6b2256f7c3f52ea2ec39ba

SHA256
05c4814add59df3a27d840a1494002ac0b0e49aa9348229bd9f438d87e3e56c1

SHA512
18b7ae05853bbe0109b3f00861b97951a7963036bbe021b3a2ae178c810257033e249613e522c3a4c16ceaa415f3358b8a052c28f321c6128228f38367991cc6

Download Submit
memory/1952-12-0x000000001C880000-0x000000001CDA8000-memory.dmp

Filesize
5.2MB

Download
memory/1952-5-0x0000000003140000-0x0000000003190000-memory.dmp

Filesize
320KB

Download
memory/1952-13-0x000000001BB90000-0x000000001BB9C000-memory.dmp

Filesize
48KB

Download
memory/1952-4-0x0000000001810000-0x000000000182C000-memory.dmp

Filesize
112KB

Download
memory/1952-7-0x00000000017B0000-0x00000000017B8000-memory.dmp

Filesize
32KB

Download
memory/1952-6-0x00000000030F0000-0x0000000003106000-memory.dmp

Filesize
88KB

Download
memory/1952-8-0x0000000001830000-0x0000000001842000-memory.dmp

Filesize
72KB

Download
memory/1952-9-0x0000000003130000-0x0000000003140000-memory.dmp

Filesize
64KB

Download
memory/1952-15-0x000000001BBB0000-0x000000001BBB8000-memory.dmp

Filesize
32KB

Download
memory/1952-11-0x0000000003120000-0x0000000003132000-memory.dmp

Filesize
72KB

Download
memory/1952-0-0x00007FFB99D13000-0x00007FFB99D15000-memory.dmp

Filesize
8KB

Download
memory/1952-3-0x0000000001790000-0x000000000179E000-memory.dmp

Filesize
56KB

Download
memory/1952-10-0x0000000003110000-0x000000000311A000-memory.dmp

Filesize
40KB

Download
memory/1952-14-0x000000001BBA0000-0x000000001BBAE000-memory.dmp

Filesize
56KB

Download
memory/1952-16-0x000000001BBC0000-0x000000001BBCE000-memory.dmp

Filesize
56KB

Download
memory/1952-17-0x000000001BBD0000-0x000000001BBDC000-memory.dmp

Filesize
48KB

Download
memory/1952-18-0x000000001BBE0000-0x000000001BBEC000-memory.dmp

Filesize
48KB

Download
memory/1952-2-0x00007FFB99D10000-0x00007FFB9A7D1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-44-0x00007FFB99D10000-0x00007FFB9A7D1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-1-0x0000000000CC0000-0x0000000000E8C000-memory.dmp

Filesize
1.8MB

Download
memory/3012-49-0x000000001CDD0000-0x000000001CDE2000-memory.dmp

Filesize
72KB

Download
memory/3012-50-0x000000001CDE0000-0x000000001CDF2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads