dcrat | 45790bd0bb5eef4380c93de089dd9bf9b137a70bdc2f78e976919b6dd4b6bb2b

General

Target

JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
Size

1.2MB
MD5

f67e9c9915e81bd08ebb0e2b57909677
SHA1

9fd3f0658a7c285d6bdcd6f5b25d3995045a5b88
SHA256

45790bd0bb5eef4380c93de089dd9bf9b137a70bdc2f78e976919b6dd4b6bb2b
SHA512

c71df4adc7b5bc534b74a25e2b7aadefb1ca0e6c8d9380785f4012bb0974df8f382a8fa3ba21ca8f91a3cbc338821fc7f7e5d3d7ab9e1b2b4ce1e0e4d1fec0fe
SSDEEP

24576:B2G/nvxW3W0nme0wCtsOkpS8BUvLlR5RevPxsJT2xdHM+4b:BbA3Huw/H08qRqvJsJTkH+

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 11 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		1688	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
		3040	schtasks.exe
		2872	schtasks.exe
		2692	schtasks.exe
		2552	schtasks.exe
		1864	schtasks.exe
		1728	schtasks.exe
		2756	schtasks.exe
		2028	schtasks.exe
		1944	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 10 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	3040	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2872	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2692	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2552	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1728	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1864	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2756	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2028	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1688	2816	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1944	2816	schtasks.exe	35

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000018bdd-12.dat	dcrat
behavioral1/memory/2968-13-0x0000000000C00000-0x0000000000CEA000-memory.dmp	dcrat
behavioral1/memory/1992-28-0x0000000000040000-0x000000000012A000-memory.dmp	dcrat
behavioral1/memory/1692-47-0x00000000009B0000-0x0000000000A9A000-memory.dmp	dcrat

Executes dropped EXE 3 IoCs

pid	Process
2968	WinsessionBrokernetIntohost.exe
1992	WinsessionBrokernetIntohost.exe
1692	dllhost.exe

Loads dropped DLL 2 IoCs

pid	Process
2828	cmd.exe
2828	cmd.exe

Adds Run key to start application 2 TTPs 10 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\sppsvc = "\"C:\\Windows\\System32\\wisptis\\sppsvc.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\qprocess\\services.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\MSOCache\\All Users\\{90140000-0115-0409-0000-0000000FF1CE}-C\\1033\\dllhost.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\portabledeviceapi\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\rasphone\\spoolsv.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\MSOCache\\All Users\\{90140000-0116-0409-1000-0000000FF1CE}-C\\Idle.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Program Files (x86)\\Microsoft Sync Framework\\v1.0\\Runtime\\x86\\explorer.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Users\\Default\\Links\\smss.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\sppwmi\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\wmipdskq\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe

Drops file in System32 directory 14 IoCs

description	ioc	Process
File created	C:\Windows\System32\wisptis\sppsvc.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\sppwmi\24dbde2999530ef5fd907494bc374d663924116c	WinsessionBrokernetIntohost.exe
File opened for modification	C:\Windows\System32\wbem\wmipdskq\WmiPrvSE.exe	WinsessionBrokernetIntohost.exe
File opened for modification	C:\Windows\System32\wisptis\sppsvc.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\sppwmi\WmiPrvSE.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\wmipdskq\WmiPrvSE.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\rasphone\spoolsv.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\portabledeviceapi\24dbde2999530ef5fd907494bc374d663924116c	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\rasphone\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wisptis\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\wmipdskq\24dbde2999530ef5fd907494bc374d663924116c	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\qprocess\services.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\qprocess\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\wbem\portabledeviceapi\WmiPrvSE.exe	WinsessionBrokernetIntohost.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Runtime\x86\explorer.exe	WinsessionBrokernetIntohost.exe
File created	C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Runtime\x86\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	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	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.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 10 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3040	schtasks.exe
2872	schtasks.exe
2692	schtasks.exe
1864	schtasks.exe
2756	schtasks.exe
1688	schtasks.exe
2552	schtasks.exe
1728	schtasks.exe
2028	schtasks.exe
1944	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2968	WinsessionBrokernetIntohost.exe
1992	WinsessionBrokernetIntohost.exe
1692	dllhost.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2968	WinsessionBrokernetIntohost.exe
Token: SeDebugPrivilege	1992	WinsessionBrokernetIntohost.exe
Token: SeDebugPrivilege	1692	dllhost.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2636 wrote to memory of 2352	2636	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	30
PID 2636 wrote to memory of 2352	2636	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	30
PID 2636 wrote to memory of 2352	2636	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	30
PID 2636 wrote to memory of 2352	2636	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	30
PID 2352 wrote to memory of 2828	2352	WScript.exe	32
PID 2352 wrote to memory of 2828	2352	WScript.exe	32
PID 2352 wrote to memory of 2828	2352	WScript.exe	32
PID 2352 wrote to memory of 2828	2352	WScript.exe	32
PID 2828 wrote to memory of 2968	2828	cmd.exe	34
PID 2828 wrote to memory of 2968	2828	cmd.exe	34
PID 2828 wrote to memory of 2968	2828	cmd.exe	34
PID 2828 wrote to memory of 2968	2828	cmd.exe	34
PID 2968 wrote to memory of 2340	2968	WinsessionBrokernetIntohost.exe	40
PID 2968 wrote to memory of 2340	2968	WinsessionBrokernetIntohost.exe	40
PID 2968 wrote to memory of 2340	2968	WinsessionBrokernetIntohost.exe	40
PID 2340 wrote to memory of 656	2340	cmd.exe	42
PID 2340 wrote to memory of 656	2340	cmd.exe	42
PID 2340 wrote to memory of 656	2340	cmd.exe	42
PID 2340 wrote to memory of 1992	2340	cmd.exe	43
PID 2340 wrote to memory of 1992	2340	cmd.exe	43
PID 2340 wrote to memory of 1992	2340	cmd.exe	43
PID 1992 wrote to memory of 1692	1992	WinsessionBrokernetIntohost.exe	50
PID 1992 wrote to memory of 1692	1992	WinsessionBrokernetIntohost.exe	50
PID 1992 wrote to memory of 1692	1992	WinsessionBrokernetIntohost.exe	50

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\JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2636
- 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:2352
- - 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:2828
  - - 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:2968
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\j3gTZGu6ZK.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2340
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:656
      - C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe
        
        "C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Drops file in System32 directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1992
        
        C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\dllhost.exe
        
        "C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\dllhost.exe"
        7⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\wisptis\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Sync Framework\v1.0\Runtime\x86\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Users\Default\Links\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\sppwmi\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\wmipdskq\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1728

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\qprocess\services.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\portabledeviceapi\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\rasphone\spoolsv.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\Idle.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1944

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\j3gTZGu6ZK.bat

Filesize
246B

MD5
f43da31abfb27dc3de296834872e30be

SHA1
bc3e31b3b8b98fc6b145ce32dd09808cad59b24a

SHA256
6db173c8a3a08d5ad17ebae842068c9bfd419df78c5926f345d75ea46b36c04d

SHA512
42b3fd68a97a9f89b26b60f707db5274041322ceb3e78630cce7edd67103cf8790845278f32b63dcac134a2de1939e753dd55e16f7536a02b04b6f7712cb9b24

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

Filesize
910KB

MD5
3c0e66c07059d17b9dec156ae1f99fcf

SHA1
a9cf63368c43a839590f55a4896d503909d4ea76

SHA256
bd10ea4eeb2a7f1e9b3157ce51752336fe3d6dc56fb49bdc736bbe0ea34f5936

SHA512
4a7d7555e6cf982c62fe7185f7b147c959a82b3be5e33aeec7bc9f22ab8adcdf4cf9ca10a2a7be50a7f98c19402f8bde9fff22ff8de3e3727a8a35604767ab39

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
memory/1692-47-0x00000000009B0000-0x0000000000A9A000-memory.dmp

Filesize
936KB

Download
memory/1992-28-0x0000000000040000-0x000000000012A000-memory.dmp

Filesize
936KB

Download
memory/2968-13-0x0000000000C00000-0x0000000000CEA000-memory.dmp

Filesize
936KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads