dcrat | 0ea1a8292aca1e59f3e6ac577ed72e2be6a6ed29ac8f45a702e13add14348776

General

Target

36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe
Size

1.1MB
MD5

150550df367f8d6334843deee8de66a3
SHA1

8edcd7ff34e8c4a6cbc74fe57c831e5c400783f4
SHA256

36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496
SHA512

427afc1255c109d47c1b879ba84c98225becd644cea03a4b926679381a73aeb6760bd974af558f667fd2588077ba701e8193a20c788bfd5a601dfa5f4712438c
SSDEEP

24576:U2G/nvxW3Ww0tWumqZzVuY4G+bGGnHkUeaC6qEKKH8:UbA30iyuY4GEHkZ2KF

Score

10^/10

dcrat discovery infostealer rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Dcrat family
dcrat

Process spawned unexpected child process 24 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	2136	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2900	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4760	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4032	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3776	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4640	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3032	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3176	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4860	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4184	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3988	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5068	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4264	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1808	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1316	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1072	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1148	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	696	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3152	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1528	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4988	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	440	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	812	216	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2380	216	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b91-10.dat	dcrat
behavioral2/memory/376-13-0x0000000000090000-0x0000000000166000-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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	blockport.exe

Executes dropped EXE 2 IoCs

pid	Process
376	blockport.exe
1676	sysmon.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files\Mozilla Firefox\dllhost.exe	blockport.exe
File created	C:\Program Files\Mozilla Firefox\5940a34987c991	blockport.exe
File created	C:\Program Files\Windows Security\upfc.exe	blockport.exe
File created	C:\Program Files\Windows Security\ea1d8f6d871115	blockport.exe
File created	C:\Program Files\Windows Media Player\en-US\explorer.exe	blockport.exe
File created	C:\Program Files\Windows Media Player\en-US\7a0fd90576e088	blockport.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	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.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 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2136	schtasks.exe
3176	schtasks.exe
3988	schtasks.exe
1808	schtasks.exe
1316	schtasks.exe
1148	schtasks.exe
4988	schtasks.exe
812	schtasks.exe
2900	schtasks.exe
4760	schtasks.exe
4640	schtasks.exe
4184	schtasks.exe
5068	schtasks.exe
2380	schtasks.exe
696	schtasks.exe
3152	schtasks.exe
4032	schtasks.exe
3776	schtasks.exe
3032	schtasks.exe
4860	schtasks.exe
1072	schtasks.exe
4264	schtasks.exe
1528	schtasks.exe
440	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
376	blockport.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe
1676	sysmon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1676	sysmon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	376	blockport.exe
Token: SeDebugPrivilege	1676	sysmon.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2224 wrote to memory of 3956	2224	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe	83
PID 2224 wrote to memory of 3956	2224	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe	83
PID 2224 wrote to memory of 3956	2224	36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe	83
PID 3956 wrote to memory of 4708	3956	WScript.exe	84
PID 3956 wrote to memory of 4708	3956	WScript.exe	84
PID 3956 wrote to memory of 4708	3956	WScript.exe	84
PID 4708 wrote to memory of 376	4708	cmd.exe	86
PID 4708 wrote to memory of 376	4708	cmd.exe	86
PID 376 wrote to memory of 1676	376	blockport.exe	113
PID 376 wrote to memory of 1676	376	blockport.exe	113

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\36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe
"C:\Users\Admin\AppData\Local\Temp\36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2224
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontrefPerfmonitor\C7WmfIuC8zQxx.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3956
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\FontrefPerfmonitor\6xajXYt4OYp.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4708
  - - C:\FontrefPerfmonitor\blockport.exe
      "C:\FontrefPerfmonitor\blockport.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:376
    - - C:\Recovery\WindowsRE\sysmon.exe
        
        "C:\Recovery\WindowsRE\sysmon.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2136

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\en-US\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\en-US\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Media Player\en-US\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4184

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3988

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Mozilla Firefox\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Program Files\Mozilla Firefox\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Security\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1072

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files\Windows Security\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Security\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:696

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\FontrefPerfmonitor\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3152

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\FontrefPerfmonitor\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\FontrefPerfmonitor\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4988

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\blockport.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockport" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "blockportb" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\blockport.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2380

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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:\FontrefPerfmonitor\6xajXYt4OYp.bat

Filesize
37B

MD5
ce8d79d29a7f61ae455fbd0c51c15979

SHA1
bf8b31f3c60f4476bd8d4a332349fa44d207cfcd

SHA256
0282418c33a1d8ffd54f1bfd91c9ba3a5a9dcd94f8010cdb4ac6288b8b6e40a3

SHA512
f6b6ee7b1a1b6cebcce206195e90914022bb4c462c670e8f86f282df639b30dd75dec2e10e450162f20a58460fa19da9397c577ec108f7cca3bcb09137964f07

Download Submit
C:\FontrefPerfmonitor\C7WmfIuC8zQxx.vbe

Filesize
206B

MD5
3db2d6374a93b64353f37f61b091fa26

SHA1
94bf44c5b3687ada88a193b97ecbf9ff50350f65

SHA256
3b1c7f9549b2d3a4c9053f5d17b85388828351633b827849a12056bfdc4db0b7

SHA512
10edee575fb1c8c3b7769c66898b2164eb9c4bcda85ffdac55bc674b1692bffd4537eb336dc1d599dae50b16efe0382a568175f2c2a88eebd676a3bd55642e6d

Download Submit
C:\FontrefPerfmonitor\blockport.exe

Filesize
829KB

MD5
78a0654a256451e953d47049aaa60200

SHA1
85eba2ba3f585a889380841c991937448ba61066

SHA256
271009f132fc388837832a08962ff48c1e76372e047b31cce3db4ad047746855

SHA512
71cd1ddf7defc16a65db41aa0f93c55690e7c0dbbee04df8bc7efcffa251c9bbbeb6a471e02c621fc1767c19861d787d53bddfdab36d57d081cf875348b636b3

Download Submit
memory/376-12-0x00007FFCD3AB3000-0x00007FFCD3AB5000-memory.dmp

Filesize
8KB

Download
memory/376-13-0x0000000000090000-0x0000000000166000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads