dcrat | d28b646c459395738563e52b8ec7e831da311cb91c7b627aa5c9268117c32337

General

Target

e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
Size

1.4MB
MD5

e9b76dd40f3d6b54aeb329467f261094
SHA1

f9c949ff9fee524fb7eefa3ce816adce0c1d78fd
SHA256

d28b646c459395738563e52b8ec7e831da311cb91c7b627aa5c9268117c32337
SHA512

3fb509e2b042d3abc89a3c72d3df7a45561461eeb4f39e1cce1f2c1d939b6206a898507a0074d2c1c24a80fb18e12b4e4c555a2dea5e8b3c563c6ea2e0bdee04
SSDEEP

24576:W2G/nvxW3W12U3WE31ghc4xzo3WdXRupmYvjfk19F37MSxTi/DJlT+4n:WbA3CWVCh3WLkmYrfKg/DiI

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 8 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		2628	schtasks.exe
		2012	schtasks.exe
		2180	schtasks.exe
		1632	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
		2736	schtasks.exe
		2644	schtasks.exe
		2888	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 7 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	2736	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2644	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2888	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2628	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2012	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2180	2744	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1632	2744	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0007000000015cdc-12.dat	dcrat
behavioral1/memory/2300-13-0x00000000002F0000-0x0000000000406000-memory.dmp	dcrat
behavioral1/memory/1680-34-0x0000000000E70000-0x0000000000F86000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2300	RuntimeperfnetDriversavesdll.exe
1680	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2148	cmd.exe
2148	cmd.exe

Adds Run key to start application 2 TTPs 7 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\csrss = "\"C:\\ProgramData\\Microsoft Help\\csrss.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\bthci\\winlogon.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Program Files\\Windows Media Player\\es-ES\\WmiPrvSE.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\MSOCache\\All Users\\{90140000-0016-0409-0000-0000000FF1CE}-C\\cmd.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\sqlceoledb30\\dwm.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Windows Defender\\ja-JP\\csrss.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\osppobjs-spp-plugin-manifest-signed\\OSPPSVC.exe\""	RuntimeperfnetDriversavesdll.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\System32\sqlceoledb30\6cb0b6c459d5d3455a3da700e713f2e2529862ff	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\System32\bthci\winlogon.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\System32\bthci\cc11b995f2a76da408ea6a601e682e64743153ad	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\System32\sqlceoledb30\dwm.exe	RuntimeperfnetDriversavesdll.exe
File opened for modification	C:\Windows\System32\sqlceoledb30\dwm.exe	RuntimeperfnetDriversavesdll.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Defender\ja-JP\csrss.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Program Files (x86)\Windows Defender\ja-JP\886983d96e3d3e31032c679b2d4ea91b6c05afef	RuntimeperfnetDriversavesdll.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\osppobjs-spp-plugin-manifest-signed\OSPPSVC.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\osppobjs-spp-plugin-manifest-signed\1610b97d3ab4a74cd8ae104b51bea7bfcc5b9c6f	RuntimeperfnetDriversavesdll.exe
File created	C:\Program Files\Windows Media Player\es-ES\WmiPrvSE.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Program Files\Windows Media Player\es-ES\24dbde2999530ef5fd907494bc374d663924116c	RuntimeperfnetDriversavesdll.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

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

pid	Process
2736	schtasks.exe
2644	schtasks.exe
2888	schtasks.exe
2628	schtasks.exe
2012	schtasks.exe
2180	schtasks.exe
1632	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2300	RuntimeperfnetDriversavesdll.exe
1680	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2300	RuntimeperfnetDriversavesdll.exe
Token: SeDebugPrivilege	1680	csrss.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 1992	2368	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	30
PID 2368 wrote to memory of 1992	2368	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	30
PID 2368 wrote to memory of 1992	2368	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	30
PID 2368 wrote to memory of 1992	2368	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	30
PID 1992 wrote to memory of 2148	1992	WScript.exe	32
PID 1992 wrote to memory of 2148	1992	WScript.exe	32
PID 1992 wrote to memory of 2148	1992	WScript.exe	32
PID 1992 wrote to memory of 2148	1992	WScript.exe	32
PID 2148 wrote to memory of 2300	2148	cmd.exe	34
PID 2148 wrote to memory of 2300	2148	cmd.exe	34
PID 2148 wrote to memory of 2300	2148	cmd.exe	34
PID 2148 wrote to memory of 2300	2148	cmd.exe	34
PID 2300 wrote to memory of 1680	2300	RuntimeperfnetDriversavesdll.exe	43
PID 2300 wrote to memory of 1680	2300	RuntimeperfnetDriversavesdll.exe	43
PID 2300 wrote to memory of 1680	2300	RuntimeperfnetDriversavesdll.exe	43

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\e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2368
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Runtimeperfnet\1syNKYwmRXGdL3fLPtIqT.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1992
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Runtimeperfnet\ZSSFBj4h8UyaWrgI.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2148
  - - C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.exe
      "C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.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:2300
    - - C:\ProgramData\Microsoft Help\csrss.exe
        
        "C:\ProgramData\Microsoft Help\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\sqlceoledb30\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\osppobjs-spp-plugin-manifest-signed\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2888

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\ProgramData\Microsoft Help\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\bthci\winlogon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\es-ES\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2180

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1632

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:\Runtimeperfnet\1syNKYwmRXGdL3fLPtIqT.vbe

Filesize
207B

MD5
37cf337b8f57bdb83988391601c164fd

SHA1
3addd11c005d3f111b5158b114b0dc8b9ee9836e

SHA256
c91a015ddbed9ee199867730961b1ee293cf257b0abc260d35e53dc23b8a87af

SHA512
d3a2c40786628a01b37c93e20f9d82512a5c53881b7f6db5e5babd4f7e92893526a794dc5652f3cf342bed40eb3a4a56e2404b0198f7b24093958ac825b49451

Download Submit
C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.exe

Filesize
1.1MB

MD5
8169d77b386f287c2a82e16b4946eec3

SHA1
40d37a341d757efa9f3bdccecd76d7bd4aa76827

SHA256
12215f07467ec46ec06d2a1c734dc0dc40d66c3b27bcebaebbdc3f0f0792c450

SHA512
9d82106531ddf6d452b229977956aa719b1f0ad7b20fdc328ec6b0bcd7e7915a132df12087f1c87e835808d4c8763e167f7ee9462ec1e53e3099fd4b34d18639

Download Submit
C:\Runtimeperfnet\ZSSFBj4h8UyaWrgI.bat

Filesize
52B

MD5
324b5e03c3a74a39afd97c6021786a36

SHA1
68e090d02ddef65f18fc7539cfca1851e3aee226

SHA256
ce90253c373590ee106fdf14419dbac112d81955c57c9194029bd462bd90d3ec

SHA512
8f6f45347b682baa3aa4e5307586f6c29dc6d6fb557427e887950bf947bde2bab3cecedfd70caabfa6ec5d22041988c59a096fce3224bb0d71bc3d8afcef28bd

Download Submit
memory/1680-34-0x0000000000E70000-0x0000000000F86000-memory.dmp

Filesize
1.1MB

Download
memory/2300-13-0x00000000002F0000-0x0000000000406000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads