dcrat | 4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148

General

Target

4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe
Size

1.2MB
MD5

fd7254eaa1f74120831e100852a67077
SHA1

03974b230e17665e275b1f684251456ab563b0d5
SHA256

4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148
SHA512

18d77b7853a7f2788fbe27b9ba6c1bdf529379ee0cdcce580db994ff7413ddce15464481224f1174e3769b6263d576d1da5ad88510a50399b646b23acbafc82a
SSDEEP

24576:B2G/nvxW3W0nme0wCtsOkpS8BUvLlR5RevPxsJT2xdHM+4B:BbA3Huw/H08qRqvJsJTkHq

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 10 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

description	ioc	pid	Process
		2656	schtasks.exe
		2188	schtasks.exe
		2688	schtasks.exe
		1672	schtasks.exe
		1900	schtasks.exe
		1980	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe
		2568	schtasks.exe
		2992	schtasks.exe
		396	schtasks.exe

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	2656	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2188	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2568	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2688	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2992	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1672	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	396	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1900	2792	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1980	2792	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00060000000186c8-9.dat	dcrat
behavioral1/memory/3056-13-0x0000000001290000-0x000000000137A000-memory.dmp	dcrat
behavioral1/memory/1348-39-0x0000000000BE0000-0x0000000000CCA000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
3056	WinsessionBrokernetIntohost.exe
1348	sppsvc.exe

Loads dropped DLL 2 IoCs

pid	Process
2660	cmd.exe
2660	cmd.exe

Adds Run key to start application 2 TTPs 9 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\dllhost = "\"C:\\Windows\\System32\\drt\\dllhost.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Documents and Settings\\smss.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\ProgramData\\Package Cache\\{BF08E976-B92E-4336-B56F-2171179476C4}v14.30.30704\\packages\\vcRuntimeAdditional_x86\\csrss.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\System32\\C_1140\\sppsvc.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\v3.0\\SubsetList\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Program Files (x86)\\Mozilla Maintenance Service\\logs\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Recovery\\1a287102-69f6-11ef-b2ff-62cb582c238c\\smss.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\licmgr10\\taskhost.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Program Files (x86)\\Mozilla Maintenance Service\\logs\\wininit.exe\""	WinsessionBrokernetIntohost.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\C_1140\sppsvc.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\C_1140\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\drt\dllhost.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\drt\5940a34987c99120d96dace90a3f93f329dcad63	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\licmgr10\taskhost.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\licmgr10\b75386f1303e64d8139363b71e44ac16341adf4e	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\C_1140\sppsvc.exe	WinsessionBrokernetIntohost.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\SubsetList\24dbde2999530ef5fd907494bc374d663924116c	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\WmiPrvSE.exe	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\24dbde2999530ef5fd907494bc374d663924116c	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\wininit.exe	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\560854153607923c4c5f107085a7db67be01f252	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\SubsetList\WmiPrvSE.exe	WinsessionBrokernetIntohost.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	4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
2188	schtasks.exe
2688	schtasks.exe
2992	schtasks.exe
1672	schtasks.exe
1980	schtasks.exe
2656	schtasks.exe
2568	schtasks.exe
396	schtasks.exe
1900	schtasks.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
1348	sppsvc.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3056	WinsessionBrokernetIntohost.exe
1348	sppsvc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3056	WinsessionBrokernetIntohost.exe
Token: SeDebugPrivilege	1348	sppsvc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2008 wrote to memory of 2084	2008	4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe	30
PID 2008 wrote to memory of 2084	2008	4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe	30
PID 2008 wrote to memory of 2084	2008	4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe	30
PID 2008 wrote to memory of 2084	2008	4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe	30
PID 2084 wrote to memory of 2660	2084	WScript.exe	31
PID 2084 wrote to memory of 2660	2084	WScript.exe	31
PID 2084 wrote to memory of 2660	2084	WScript.exe	31
PID 2084 wrote to memory of 2660	2084	WScript.exe	31
PID 2660 wrote to memory of 3056	2660	cmd.exe	33
PID 2660 wrote to memory of 3056	2660	cmd.exe	33
PID 2660 wrote to memory of 3056	2660	cmd.exe	33
PID 2660 wrote to memory of 3056	2660	cmd.exe	33
PID 3056 wrote to memory of 2476	3056	WinsessionBrokernetIntohost.exe	45
PID 3056 wrote to memory of 2476	3056	WinsessionBrokernetIntohost.exe	45
PID 3056 wrote to memory of 2476	3056	WinsessionBrokernetIntohost.exe	45
PID 2476 wrote to memory of 1076	2476	cmd.exe	47
PID 2476 wrote to memory of 1076	2476	cmd.exe	47
PID 2476 wrote to memory of 1076	2476	cmd.exe	47
PID 2476 wrote to memory of 1348	2476	cmd.exe	48
PID 2476 wrote to memory of 1348	2476	cmd.exe	48
PID 2476 wrote to memory of 1348	2476	cmd.exe	48
PID 2476 wrote to memory of 1348	2476	cmd.exe	48
PID 2476 wrote to memory of 1348	2476	cmd.exe	48

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\4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe
"C:\Users\Admin\AppData\Local\Temp\4f397836d46f499ed2e76b1d3df48a3327732dcc5c5f88b566add627932ad148.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2008
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\ufqa67DL2gtzgC.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2084
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\vxdOo.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2660
  - - C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe
      "C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3056
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\J2QPpXHnoX.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2476
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1076
      - C:\Windows\System32\C_1140\sppsvc.exe
        
        "C:\Windows\System32\C_1140\sppsvc.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: CmdExeWriteProcessMemorySpam
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\C_1140\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\drt\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Documents and Settings\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\SubsetList\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ProgramData\Package Cache\{BF08E976-B92E-4336-B56F-2171179476C4}v14.30.30704\packages\vcRuntimeAdditional_x86\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\licmgr10\taskhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1980

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

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\J2QPpXHnoX.bat

Filesize
201B

MD5
9babe745731f266382afffc1a92a0fdc

SHA1
da9207e890d8b2157db1e69fa055cac26cfe1a07

SHA256
02629bea3886d0ba02e35275e21eaccd351ecd3de742e7cc306b27e3b781f2d7

SHA512
567ed342cb9d0dc31df341acb82df21b754340f5d0318918c0669e6be0fea6b7ef589fd80dfc270b4fd8b414751c4b1d68d14773901f40117b1f4b90aacbc450

Download Submit
C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\ufqa67DL2gtzgC.vbe

Filesize
208B

MD5
79ec3118b469d48b8b3b6a1c0b330fb5

SHA1
9ef874c6a1ca3af5e07e83260dee0dc6ff7e3816

SHA256
b3bbe75c2eed62015193612b19c38eabb1c7a7b51797ad9ffa26b1eb7485839f

SHA512
0d085322c07d4553cbe7303a1a88ec329845a25ba07efe83989f912ab4e311f7ef891c2c071e87adb2de2b8b2c4e4ef5a2673b02ad8b45444e6663ead1fd0580

Download Submit
C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\vxdOo.bat

Filesize
63B

MD5
ea5bc8528b06faf92eaa4f0d6194365b

SHA1
734509caf332eeffcdfea6d079b45653876e221d

SHA256
e1d8b03b08fd259e5a9cda84dc3f646bd68701ae82586e48072b62107dfb0f7a

SHA512
11cc2fd1bd98468908a197944fbd133c23899284fb745159b140d9e1f477d8c96a03c167a229814089fdc31ceed18d32992f05dd96369cbed290b3004d298edb

Download Submit
\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe

Filesize
910KB

MD5
3c0e66c07059d17b9dec156ae1f99fcf

SHA1
a9cf63368c43a839590f55a4896d503909d4ea76

SHA256
bd10ea4eeb2a7f1e9b3157ce51752336fe3d6dc56fb49bdc736bbe0ea34f5936

SHA512
4a7d7555e6cf982c62fe7185f7b147c959a82b3be5e33aeec7bc9f22ab8adcdf4cf9ca10a2a7be50a7f98c19402f8bde9fff22ff8de3e3727a8a35604767ab39

Download Submit
memory/1348-39-0x0000000000BE0000-0x0000000000CCA000-memory.dmp

Filesize
936KB

Download
memory/3056-13-0x0000000001290000-0x000000000137A000-memory.dmp

Filesize
936KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads