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 9 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		1956	schtasks.exe
		4800	schtasks.exe
		2752	schtasks.exe
		64	schtasks.exe
		3504	schtasks.exe
		3488	schtasks.exe
		4520	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
		2288	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 8 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	2288	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2752	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	64	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1956	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4800	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3504	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3488	2524	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4520	2524	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b69-10.dat	dcrat
behavioral2/memory/1344-13-0x0000000000B00000-0x0000000000BEA000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WinsessionBrokernetIntohost.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
1344	WinsessionBrokernetIntohost.exe
1508	dwm.exe

Adds Run key to start application 2 TTPs 8 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\\BdeHdCfgLib\\RuntimeBroker.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\Windows.UI.Xaml.Resources.win8rtm\\dwm.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Documents and Settings\\conhost.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\InputHost\\dwm.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Users\\Default\\Favorites\\WmiPrvSE.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\cmstp\\fontdrvhost.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\TrustedSignalCredProv\\spoolsv.exe\""	WinsessionBrokernetIntohost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinsessionBrokernetIntohost = "\"C:\\Windows\\IME\\WinsessionBrokernetIntohost.exe\""	WinsessionBrokernetIntohost.exe

Drops file in System32 directory 10 IoCs

description	ioc	Process
File created	C:\Windows\System32\cmstp\fontdrvhost.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\cmstp\5b884080fd4f94e2695da25c503f9e33b9605b83	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\Windows.UI.Xaml.Resources.win8rtm\6cb0b6c459d5d3455a3da700e713f2e2529862ff	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\InputHost\dwm.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\InputHost\6cb0b6c459d5d3455a3da700e713f2e2529862ff	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\TrustedSignalCredProv\spoolsv.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\TrustedSignalCredProv\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\BdeHdCfgLib\RuntimeBroker.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\BdeHdCfgLib\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	WinsessionBrokernetIntohost.exe
File created	C:\Windows\System32\Windows.UI.Xaml.Resources.win8rtm\dwm.exe	WinsessionBrokernetIntohost.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\IME\WinsessionBrokernetIntohost.exe	WinsessionBrokernetIntohost.exe
File opened for modification	C:\Windows\IME\WinsessionBrokernetIntohost.exe	WinsessionBrokernetIntohost.exe
File created	C:\Windows\IME\6802d49560e6967b6f231d6e1692a9775cc05560	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

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	WinsessionBrokernetIntohost.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 8 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2288	schtasks.exe
2752	schtasks.exe
64	schtasks.exe
1956	schtasks.exe
4800	schtasks.exe
3504	schtasks.exe
3488	schtasks.exe
4520	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1344	WinsessionBrokernetIntohost.exe
1508	dwm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1344	WinsessionBrokernetIntohost.exe
Token: SeDebugPrivilege	1508	dwm.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3592 wrote to memory of 2928	3592	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	83
PID 3592 wrote to memory of 2928	3592	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	83
PID 3592 wrote to memory of 2928	3592	JaffaCakes118_f67e9c9915e81bd08ebb0e2b57909677.exe	83
PID 2928 wrote to memory of 5044	2928	WScript.exe	93
PID 2928 wrote to memory of 5044	2928	WScript.exe	93
PID 2928 wrote to memory of 5044	2928	WScript.exe	93
PID 5044 wrote to memory of 1344	5044	cmd.exe	95
PID 5044 wrote to memory of 1344	5044	cmd.exe	95
PID 1344 wrote to memory of 3252	1344	WinsessionBrokernetIntohost.exe	104
PID 1344 wrote to memory of 3252	1344	WinsessionBrokernetIntohost.exe	104
PID 3252 wrote to memory of 376	3252	cmd.exe	106
PID 3252 wrote to memory of 376	3252	cmd.exe	106
PID 3252 wrote to memory of 1508	3252	cmd.exe	112
PID 3252 wrote to memory of 1508	3252	cmd.exe	112

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
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3592
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\ufqa67DL2gtzgC.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2928
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\vxdOo.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:5044
  - - C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe
      "C:\Users\Admin\AppData\Roaming\WinsessionBrokernet\WinsessionBrokernetIntohost.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1344
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Jcrk07F19t.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3252
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:376
      - C:\Windows\System32\Windows.UI.Xaml.Resources.win8rtm\dwm.exe
        
        "C:\Windows\System32\Windows.UI.Xaml.Resources.win8rtm\dwm.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WinsessionBrokernetIntohost" /sc ONLOGON /tr "'C:\Windows\IME\WinsessionBrokernetIntohost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2288

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\BdeHdCfgLib\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\Windows.UI.Xaml.Resources.win8rtm\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:64

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Documents and Settings\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\InputHost\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Users\Default\Favorites\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\cmstp\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3488

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\TrustedSignalCredProv\spoolsv.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4520

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

2

T1012

System Information Discovery

2

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\Jcrk07F19t.bat

Filesize
225B

MD5
179c3e8e3cafe3e0d38f0e72bfa7f427

SHA1
965e2ff7c18b7042e32c573b56c7b3b28ccf8e67

SHA256
3b7dcf66079034acc823328422b974eb179b081f8e8e2b9571dff6f1852ee8ff

SHA512
e86e72552abbc08fbe0bdff0ffc38a1ae9f1b6bdc2c92d6000a83e8c9b8618a291fc85863ccc45a4b6f4e00c3d14a28b2229da55a1065fe55630d23a614d7270

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/1344-12-0x00007FFB52483000-0x00007FFB52485000-memory.dmp

Filesize
8KB

Download
memory/1344-13-0x0000000000B00000-0x0000000000BEA000-memory.dmp

Filesize
936KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads