dcrat | e0b451a5258bdacc66d22f0e7b45b67cb35a5bb7acab07aac122bd472e5a0827

General

Target

JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe
Size

1.2MB
MD5

3381479bab1dcacfbb8a7e4a4537f5f9
SHA1

771087a449813a1ab214aec8447122d28d772bfd
SHA256

e0b451a5258bdacc66d22f0e7b45b67cb35a5bb7acab07aac122bd472e5a0827
SHA512

a062dc024ba2effa2373790775f103cc8a14662ce444280b631656c816832f4e173f4e943c1efa0e8f39a0e66c77a2ccfe47df25970944bba47610f02932af73
SSDEEP

24576:s2G/nvxW3WvpSbNLEJxpseQihFqfmVPOBBD+4L:sbA3WM9MxBTZ3m

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
		100	schtasks.exe
		4608	schtasks.exe
		1424	schtasks.exe
		4672	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe
		3084	schtasks.exe
		4248	schtasks.exe
		1760	schtasks.exe
		3044	schtasks.exe
		1996	schtasks.exe
		3172	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	3084	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	100	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4248	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1760	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3044	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4608	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1996	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3172	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1424	2408	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4672	2408	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023cb9-9.dat	dcrat
behavioral2/memory/2040-13-0x00000000006C0000-0x00000000007AC000-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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	FontwinintoRefdllNet.exe

Executes dropped EXE 2 IoCs

pid	Process
2040	FontwinintoRefdllNet.exe
2020	RuntimeBroker.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\dwm = "\"C:\\Windows\\System32\\pku2u\\dwm.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Recovery\\WindowsRE\\OfficeClickToRun.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\Wdf01000Uninstall\\unsecapp.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\SharedPerformance\\OfficeClickToRun.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\Windows.Media.Ocr\\fontdrvhost.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\PerfLogs\\fontdrvhost.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\MDMAppProv\\unsecapp.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\FontwinintoRefdllNet = "\"C:\\Users\\Admin\\AppData\\Roaming\\Fontwininto\\Q8Jl1DujYt\\FontwinintoRefdllNet.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\PerfLogs\\RuntimeBroker.exe\""	FontwinintoRefdllNet.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\ResourcePolicyServer\\RuntimeBroker.exe\""	FontwinintoRefdllNet.exe

Drops file in System32 directory 11 IoCs

description	ioc	Process
File created	C:\Windows\System32\wbem\MDMAppProv\unsecapp.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\ResourcePolicyServer\RuntimeBroker.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\ResourcePolicyServer\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\pku2u\dwm.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\Windows.Media.Ocr\fontdrvhost.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\Windows.Media.Ocr\5b884080fd4f94e2695da25c503f9e33b9605b83	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\wbem\Wdf01000Uninstall\unsecapp.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\wbem\Wdf01000Uninstall\29c1c3cc0f76855c7e7456076a4ffc27e4947119	FontwinintoRefdllNet.exe
File opened for modification	C:\Windows\System32\wbem\MDMAppProv\unsecapp.exe	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\wbem\MDMAppProv\29c1c3cc0f76855c7e7456076a4ffc27e4947119	FontwinintoRefdllNet.exe
File created	C:\Windows\System32\pku2u\6cb0b6c459d5d3455a3da700e713f2e2529862ff	FontwinintoRefdllNet.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\SharedPerformance\OfficeClickToRun.exe	FontwinintoRefdllNet.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\SharedPerformance\e6c9b481da804f07baff8eff543b0a1441069b5d	FontwinintoRefdllNet.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	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	FontwinintoRefdllNet.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
4672	schtasks.exe
3084	schtasks.exe
100	schtasks.exe
4248	schtasks.exe
3044	schtasks.exe
1996	schtasks.exe
1424	schtasks.exe
1760	schtasks.exe
4608	schtasks.exe
3172	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2040	FontwinintoRefdllNet.exe
2040	FontwinintoRefdllNet.exe
2040	FontwinintoRefdllNet.exe
2020	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2040	FontwinintoRefdllNet.exe
Token: SeDebugPrivilege	2020	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4200 wrote to memory of 3512	4200	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe	84
PID 4200 wrote to memory of 3512	4200	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe	84
PID 4200 wrote to memory of 3512	4200	JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe	84
PID 3512 wrote to memory of 2192	3512	WScript.exe	85
PID 3512 wrote to memory of 2192	3512	WScript.exe	85
PID 3512 wrote to memory of 2192	3512	WScript.exe	85
PID 2192 wrote to memory of 2040	2192	cmd.exe	87
PID 2192 wrote to memory of 2040	2192	cmd.exe	87
PID 2040 wrote to memory of 3484	2040	FontwinintoRefdllNet.exe	99
PID 2040 wrote to memory of 3484	2040	FontwinintoRefdllNet.exe	99
PID 3484 wrote to memory of 532	3484	cmd.exe	101
PID 3484 wrote to memory of 532	3484	cmd.exe	101
PID 3484 wrote to memory of 2020	3484	cmd.exe	102
PID 3484 wrote to memory of 2020	3484	cmd.exe	102

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_3381479bab1dcacfbb8a7e4a4537f5f9.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_3381479bab1dcacfbb8a7e4a4537f5f9.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4200
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Fontwininto\WsMKGuTKQDoUceIpFc.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3512
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Fontwininto\Q8Jl1DujYt.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2192
  - - C:\Users\Admin\AppData\Roaming\Fontwininto\FontwinintoRefdllNet.exe
      "C:\Users\Admin\AppData\Roaming\Fontwininto\FontwinintoRefdllNet.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2040
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\UK3abNEhRk.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3484
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:532
      - C:\Windows\System32\ResourcePolicyServer\RuntimeBroker.exe
        
        "C:\Windows\System32\ResourcePolicyServer\RuntimeBroker.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\MDMAppProv\unsecapp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "FontwinintoRefdllNet" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Roaming\Fontwininto\Q8Jl1DujYt\FontwinintoRefdllNet.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\PerfLogs\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\ResourcePolicyServer\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\pku2u\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\SharedPerformance\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1996

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\Windows.Media.Ocr\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3172

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\PerfLogs\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\Wdf01000Uninstall\unsecapp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4672

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\UK3abNEhRk.bat

Filesize
222B

MD5
41e0f5377e9cafda9d8bb068e42ea380

SHA1
948e9c9db62b6e92a562317e7df26911565fb652

SHA256
dfde3cefe9244d06df79aaf590dd3aa2679a57e9c079921e35cf9a3699d7d9ad

SHA512
b33e792102f276b19c92bdec5d74fea22887d4494222e778fe259d8cab70feaef54865860901cb4d955c5850d5ccc42c825362b3f6b12fd8a486a5754b39c02d

Download Submit
C:\Users\Admin\AppData\Roaming\Fontwininto\FontwinintoRefdllNet.exe

Filesize
912KB

MD5
1ec0ef270ff4b08fa5b6436ab0ed39d0

SHA1
363e5655608be17b3ba57bf54cd2de3be943afb4

SHA256
98372c461f60eb37116d1a876433e4d333126ddbec61cfafa7e4ed64a9f7a844

SHA512
0d08cf20e83e876b82baf7bb04b829f67fe0afab262685a25012f3789541e484fb893647ede9ff2dc48d617c647564ef1533cdd54ecfe5c9838344b072b22bd9

Download Submit
C:\Users\Admin\AppData\Roaming\Fontwininto\Q8Jl1DujYt.bat

Filesize
48B

MD5
97e115a1bf240df8c7e2fc4af9bb2f19

SHA1
431d2f966b8c228ffaf52ca94ed47506ece641ec

SHA256
caac133a0bc69373d7a39ccf8be005d00873e91be6909c3d61f446798ba70360

SHA512
a7a3c5250af1a1df5d78d30edc96521a659764c4aece6d4b6238b5bca431e4e976ccd204697e177a337587c3cf960e5f9c0d39a031e4660cfd7d5897e24fced5

Download Submit
C:\Users\Admin\AppData\Roaming\Fontwininto\WsMKGuTKQDoUceIpFc.vbe

Filesize
205B

MD5
02a82d3b9ba301e2021ae64c83fb6ae5

SHA1
07436b2f55fc4cf70e880ea1b5372e012d68df8a

SHA256
d7d37b4bcea8754e1a3d11aec318ad00b0d2ec9c46818be98dc608282a204582

SHA512
d6cbd89ecfe65647274cbc476f15beeb624f274afdfa4fc78ef92a1ad000b72bf94174c56e63da24a1d36d1f2e851f7cdf59ee330b19344d26b818f92ede3613

Download Submit
memory/2040-12-0x00007FFE58A43000-0x00007FFE58A45000-memory.dmp

Filesize
8KB

Download
memory/2040-13-0x00000000006C0000-0x00000000007AC000-memory.dmp

Filesize
944KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads