dcrat | 8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c

General

Target

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Size

682KB
MD5

054590792d65d5db6a5270d6ad965b93
SHA1

bd04bb88a8ee09284e3e0eba53677f6b999d1b46
SHA256

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c
SHA512

818e9a0ee0fa54874b811cd6fd5f61fc014508c84ec8f09f4d53b52a1f12a15a1b1cc516c35189352bc328c2cde659f969dfc6741b1319ba91689a2a19dce07e
SSDEEP

12288:RqnO3mwJNoGFAgHCRvp1i/fjqJRYFInDrX/xTU3JgXDV6blx1wgtra7B:R+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 7 IoCs

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

Processes:

schtasks.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	2572	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2704	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	760	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2112	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1780	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2224	2596	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1992	2596	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

Processes:

dwm.exe8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/2696-1-0x0000000000E30000-0x0000000000EE2000-memory.dmp	dcrat
behavioral1/files/0x000500000001a07b-17.dat	dcrat
behavioral1/memory/2408-117-0x0000000000DE0000-0x0000000000E92000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

dwm.exe

pid	Process
2408	dwm.exe

Adds Run key to start application 2 TTPs 7 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\PerfLogs\\Admin\\dllhost.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\normnfc\\spoolsv.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\eudcedit\\lsm.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Users\\Public\\Music\\Sample Music\\dwm.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Program Files (x86)\\Uninstall Information\\taskhost.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Documents and Settings\\sppsvc.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\quser\\services.exe\""	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exedwm.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe

Drops file in System32 directory 15 IoCs

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

description	ioc	Process
File created	C:\Windows\System32\quser\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\eudcedit\RCX870.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\eudcedit\lsm.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Windows\System32\normnfc\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Windows\System32\eudcedit\101b941d020240259ca4912829b53995ad543df6	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Windows\System32\quser\services.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\normnfc\RCX66C.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\eudcedit\RCX871.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Windows\System32\eudcedit\lsm.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\normnfc\spoolsv.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\quser\RCX11CA.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\quser\RCX11CB.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Windows\System32\normnfc\spoolsv.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\normnfc\RCX66B.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Windows\System32\quser\services.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

Drops file in Program Files directory 5 IoCs

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Uninstall Information\RCXCE6.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Program Files (x86)\Uninstall Information\RCXCE7.tmp	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File opened for modification	C:\Program Files (x86)\Uninstall Information\taskhost.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Program Files (x86)\Uninstall Information\taskhost.exe	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
File created	C:\Program Files (x86)\Uninstall Information\b75386f1303e64d8139363b71e44ac16341adf4e	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.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 7 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.exe

pid	Process
760	schtasks.exe
2112	schtasks.exe
1780	schtasks.exe
2224	schtasks.exe
1992	schtasks.exe
2572	schtasks.exe
2704	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exedwm.exe

pid	Process
2696	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
2408	dwm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exedwm.exe

description	pid	Process
Token: SeDebugPrivilege	2696	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Token: SeDebugPrivilege	2408	dwm.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.execmd.exe

description	pid	Process	procid_target
PID 2696 wrote to memory of 2072	2696	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe	38
PID 2696 wrote to memory of 2072	2696	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe	38
PID 2696 wrote to memory of 2072	2696	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe	38
PID 2072 wrote to memory of 2272	2072	cmd.exe	40
PID 2072 wrote to memory of 2272	2072	cmd.exe	40
PID 2072 wrote to memory of 2272	2072	cmd.exe	40
PID 2072 wrote to memory of 2408	2072	cmd.exe	41
PID 2072 wrote to memory of 2408	2072	cmd.exe	41
PID 2072 wrote to memory of 2408	2072	cmd.exe	41

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

Processes:

8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exedwm.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.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\8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe
"C:\Users\Admin\AppData\Local\Temp\8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c.exe"
1⤵
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2696
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\3lYyUGgIBs.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2072
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2272
- - C:\Users\Public\Music\Sample Music\dwm.exe
    "C:\Users\Public\Music\Sample Music\dwm.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:2408

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\PerfLogs\Admin\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\normnfc\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\eudcedit\lsm.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 "dwm" /sc ONLOGON /tr "'C:\Users\Public\Music\Sample Music\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Uninstall Information\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Documents and Settings\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2224

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\quser\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1992

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

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files (x86)\Uninstall Information\taskhost.exe

Filesize
682KB

MD5
054590792d65d5db6a5270d6ad965b93

SHA1
bd04bb88a8ee09284e3e0eba53677f6b999d1b46

SHA256
8b0b1728b6bcac3675b0e14ec262c061252bb9be0ac121d4342ac790ac96d51c

SHA512
818e9a0ee0fa54874b811cd6fd5f61fc014508c84ec8f09f4d53b52a1f12a15a1b1cc516c35189352bc328c2cde659f969dfc6741b1319ba91689a2a19dce07e

Download Submit
C:\Users\Admin\AppData\Local\Temp\3lYyUGgIBs.bat

Filesize
206B

MD5
0fbcfb80fab5945c6dd0f2bb05d1125a

SHA1
d4fc826cf19fb85da5ded0abf1a595183d5f1960

SHA256
4bb726fcbc53e2758ce0a88b637f192256cc3defa3fb68bd087c3edefa207322

SHA512
3e3433c8c1288614bf739b0c4e334fcb5b756ad6337d06f0c86ff6f29b363bbc141a5c0ce00249c9035c7cc2e35c8d02c539ab2c07773cf2be0ee8914117fb37

Download Submit
memory/2408-117-0x0000000000DE0000-0x0000000000E92000-memory.dmp

Filesize
712KB

Download
memory/2696-3-0x0000000000150000-0x0000000000160000-memory.dmp

Filesize
64KB

Download
memory/2696-4-0x0000000000160000-0x000000000016C000-memory.dmp

Filesize
48KB

Download
memory/2696-5-0x0000000000170000-0x000000000017C000-memory.dmp

Filesize
48KB

Download
memory/2696-6-0x00000000003E0000-0x00000000003EA000-memory.dmp

Filesize
40KB

Download
memory/2696-8-0x0000000000570000-0x000000000057C000-memory.dmp

Filesize
48KB

Download
memory/2696-7-0x00000000003D0000-0x00000000003D8000-memory.dmp

Filesize
32KB

Download
memory/2696-0-0x000007FEF66F3000-0x000007FEF66F4000-memory.dmp

Filesize
4KB

Download
memory/2696-2-0x000007FEF66F0000-0x000007FEF70DC000-memory.dmp

Filesize
9.9MB

Download
memory/2696-114-0x000007FEF66F0000-0x000007FEF70DC000-memory.dmp

Filesize
9.9MB

Download
memory/2696-1-0x0000000000E30000-0x0000000000EE2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads