dcrat | 22d63d9860fa09c5f5c6a6900aee81a8f0bdaf0647892d300d949c7116ebc354

General

Target

c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Size

1.1MB
MD5

c76615b8f581aaaf477d84be98e8ea7c
SHA1

b5c19a63af315762dee75232fc29862255ef87a9
SHA256

22d63d9860fa09c5f5c6a6900aee81a8f0bdaf0647892d300d949c7116ebc354
SHA512

2d159441ca886fbb35e1a1c6acb6203c5efe4944759d87e157f7507967eb1b1f0a0fb14fd27c280f45c1a715212aa7c5fc9e87606ec9420efbf5b3510a92dc2c
SSDEEP

24576:foVOdgE22Jlx52AdzNYBO7X6zOTYqVJ7dmnhRVxOWF0+4:1gqx5rgO790e8Dn

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat 13 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		3640	schtasks.exe
		1084	schtasks.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\v3.0\\ja\\csrss.exe\""		c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
		4112	schtasks.exe
File created	C:\Windows\System32\Windows.Networking.UX.EapRequestHandler\RuntimeBroker.exe		c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\Windows.Networking.UX.EapRequestHandler\\RuntimeBroker.exe\""		c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
		4800	schtasks.exe
		4404	schtasks.exe
		492	schtasks.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Program Files\\Mozilla Firefox\\browser\\features\\dllhost.exe\""		c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\Snooze_80.contrast-black\\lsass.exe\""		c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
		2068	schtasks.exe
		2896	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	1084	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4404	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	492	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4112	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4800	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2068	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3640	2724	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2896	2724	schtasks.exe	82

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1960-1-0x0000000000120000-0x0000000000238000-memory.dmp	dcrat
behavioral2/files/0x0009000000023c28-19.dat	dcrat

Checks computer location settings 2 TTPs 2 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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe

Executes dropped EXE 1 IoCs

pid	Process
4704	unsecapp.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\unsecapp = "\"C:\\Documents and Settings\\unsecapp.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\Win32_EncryptableVolumeUninstall\\WmiPrvSE.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Recovery\\WindowsRE\\lsass.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Documents and Settings\\csrss.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\Windows.Networking.UX.EapRequestHandler\\RuntimeBroker.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\v3.0\\ja\\csrss.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Program Files\\Mozilla Firefox\\browser\\features\\dllhost.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\Snooze_80.contrast-black\\lsass.exe\""	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\Snooze_80.contrast-black\lsass.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Windows\System32\Snooze_80.contrast-black\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Windows\System32\wbem\Win32_EncryptableVolumeUninstall\WmiPrvSE.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Windows\System32\wbem\Win32_EncryptableVolumeUninstall\24dbde2999530ef5fd907494bc374d663924116c	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Windows\System32\Windows.Networking.UX.EapRequestHandler\RuntimeBroker.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File opened for modification	C:\Windows\System32\Windows.Networking.UX.EapRequestHandler\RuntimeBroker.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Windows\System32\Windows.Networking.UX.EapRequestHandler\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Mozilla Firefox\browser\features\5940a34987c99120d96dace90a3f93f329dcad63	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\ja\csrss.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\ja\886983d96e3d3e31032c679b2d4ea91b6c05afef	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
File created	C:\Program Files\Mozilla Firefox\browser\features\dllhost.exe	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.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
4404	schtasks.exe
492	schtasks.exe
4112	schtasks.exe
4800	schtasks.exe
2068	schtasks.exe
3640	schtasks.exe
2896	schtasks.exe
1084	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
2516	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
4704	unsecapp.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Token: SeDebugPrivilege	2516	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
Token: SeDebugPrivilege	4704	unsecapp.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1696	1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe	87
PID 1960 wrote to memory of 1696	1960	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe	87
PID 1696 wrote to memory of 1804	1696	cmd.exe	89
PID 1696 wrote to memory of 1804	1696	cmd.exe	89
PID 1696 wrote to memory of 2440	1696	cmd.exe	90
PID 1696 wrote to memory of 2440	1696	cmd.exe	90
PID 1696 wrote to memory of 2516	1696	cmd.exe	91
PID 1696 wrote to memory of 2516	1696	cmd.exe	91
PID 2516 wrote to memory of 444	2516	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe	98
PID 2516 wrote to memory of 444	2516	c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe	98
PID 444 wrote to memory of 3892	444	cmd.exe	100
PID 444 wrote to memory of 3892	444	cmd.exe	100
PID 444 wrote to memory of 460	444	cmd.exe	101
PID 444 wrote to memory of 460	444	cmd.exe	101
PID 444 wrote to memory of 4704	444	cmd.exe	104
PID 444 wrote to memory of 4704	444	cmd.exe	104

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\c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe"
1⤵
- DcRat
- Checks computer location settings
- 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:1960
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Gc7QmPFxW5.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1696
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:1804
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2440
- - C:\Users\Admin\AppData\Local\Temp\c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe
    "C:\Users\Admin\AppData\Local\Temp\c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe"
    3⤵
    - Checks computer location settings
    - Adds Run key to start application
    - Drops file in System32 directory
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2516
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\uRKTj1oKgu.bat"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:444
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:3892
    - - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        
        PID:460
    - - C:\Documents and Settings\unsecapp.exe
        
        "C:\Documents and Settings\unsecapp.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\Windows.Networking.UX.EapRequestHandler\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\ja\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\browser\features\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:492

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\Snooze_80.contrast-black\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Documents and Settings\unsecapp.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:\Windows\System32\wbem\Win32_EncryptableVolumeUninstall\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Documents and Settings\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2896

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\c76615b8f581aaaf477d84be98e8ea7c_JaffaCakes118.exe.log

Filesize
1KB

MD5
b7c0c43fc7804baaa7dc87152cdc9554

SHA1
1bab62bd56af745678d4e967d91e1ccfdeed4038

SHA256
46386a61f3aaf1b1c2e6efc9fc7e9e9ff16cd13ae58b8d856835771fedb6d457

SHA512
9fda3dd00a3406137e0113f13f78e77b20a76512b35820d38df696842cbbf2e2ebabfb99a3846c9637ecb54af858ec1551521187e379872973006426a253f769

Download Submit
C:\Users\Admin\AppData\Local\Temp\Gc7QmPFxW5.bat

Filesize
300B

MD5
e0df6527b115d6e905456a613ade2117

SHA1
0ba89422ebb807115d05b63741099d6fcc7cc6fe

SHA256
378056ab1558e451a257f4b4eedb6e4f99ba650468f8301ea00dff18324043af

SHA512
3a0cc9a7106dee87107aeadddac74c19ceefa9d3b6e4d33fe9b12455fd3e353895e41f682ca8a1c14c5f44a54079529b19b7b0c92e4c27681349eb7a0a862b70

Download Submit
C:\Users\Admin\AppData\Local\Temp\uRKTj1oKgu.bat

Filesize
254B

MD5
9b4045501d8844e456d8ae8b7a568f98

SHA1
60e35d32892ecd16dd70d82747c2604003044485

SHA256
65243c3d2bcf83934720ddf93ba42311f7d5a3deccdbe742256b7d05dd18fad4

SHA512
df37cd05d996ffed678a6cbd39a133f83ecfdde2930ca0c78a556deb457bd6e32c55e09e7f66451f3d9ee9bb82061c694b210a3de3e2f43901306acba95ac3d5

Download Submit
C:\Users\unsecapp.exe

Filesize
1.1MB

MD5
c76615b8f581aaaf477d84be98e8ea7c

SHA1
b5c19a63af315762dee75232fc29862255ef87a9

SHA256
22d63d9860fa09c5f5c6a6900aee81a8f0bdaf0647892d300d949c7116ebc354

SHA512
2d159441ca886fbb35e1a1c6acb6203c5efe4944759d87e157f7507967eb1b1f0a0fb14fd27c280f45c1a715212aa7c5fc9e87606ec9420efbf5b3510a92dc2c

Download Submit
memory/1960-0-0x00007FFC0E1E3000-0x00007FFC0E1E5000-memory.dmp

Filesize
8KB

Download
memory/1960-1-0x0000000000120000-0x0000000000238000-memory.dmp

Filesize
1.1MB

Download
memory/1960-2-0x00007FFC0E1E0000-0x00007FFC0ECA1000-memory.dmp

Filesize
10.8MB

Download
memory/1960-16-0x00007FFC0E1E0000-0x00007FFC0ECA1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads