dcrat | 36fce76e89c0c4e4798956b61abad0e5e28e0732763699ce3c5003518b643496

General

Target

150550DF367F8D6334843DEEE8DE66A3.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	2768	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3064	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2580	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2540	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3012	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1852	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1032	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1716	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	304	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1756	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1704	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	796	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	540	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2052	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2520	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1268	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2028	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2800	2748	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2996	2748	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00060000000186f2-10.dat	dcrat
behavioral1/memory/1700-13-0x0000000000200000-0x00000000002D6000-memory.dmp	dcrat
behavioral1/memory/2396-36-0x0000000001310000-0x00000000013E6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1700	blockport.exe
2396	spoolsv.exe

Loads dropped DLL 2 IoCs

pid	Process
2736	cmd.exe
2736	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe	blockport.exe
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\f3b6ecef712a24	blockport.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\Downloaded Program Files\cc11b995f2a76d	blockport.exe
File created	C:\Windows\Microsoft.NET\sppsvc.exe	blockport.exe
File created	C:\Windows\Microsoft.NET\0a1fd5f707cd16	blockport.exe
File created	C:\Windows\Downloaded Program Files\winlogon.exe	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	150550DF367F8D6334843DEEE8DE66A3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
2600	schtasks.exe
1032	schtasks.exe
2052	schtasks.exe
2520	schtasks.exe
2028	schtasks.exe
2712	schtasks.exe
2580	schtasks.exe
2624	schtasks.exe
1852	schtasks.exe
1816	schtasks.exe
3064	schtasks.exe
3012	schtasks.exe
1716	schtasks.exe
304	schtasks.exe
1704	schtasks.exe
2032	schtasks.exe
2800	schtasks.exe
2996	schtasks.exe
2768	schtasks.exe
1756	schtasks.exe
796	schtasks.exe
540	schtasks.exe
1268	schtasks.exe
2540	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
1700	blockport.exe
1700	blockport.exe
1700	blockport.exe
1700	blockport.exe
1700	blockport.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe
2396	spoolsv.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2396	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1700	blockport.exe
Token: SeDebugPrivilege	2396	spoolsv.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2832 wrote to memory of 2320	2832	150550DF367F8D6334843DEEE8DE66A3.exe	31
PID 2832 wrote to memory of 2320	2832	150550DF367F8D6334843DEEE8DE66A3.exe	31
PID 2832 wrote to memory of 2320	2832	150550DF367F8D6334843DEEE8DE66A3.exe	31
PID 2832 wrote to memory of 2320	2832	150550DF367F8D6334843DEEE8DE66A3.exe	31
PID 2320 wrote to memory of 2736	2320	WScript.exe	32
PID 2320 wrote to memory of 2736	2320	WScript.exe	32
PID 2320 wrote to memory of 2736	2320	WScript.exe	32
PID 2320 wrote to memory of 2736	2320	WScript.exe	32
PID 2736 wrote to memory of 1700	2736	cmd.exe	34
PID 2736 wrote to memory of 1700	2736	cmd.exe	34
PID 2736 wrote to memory of 1700	2736	cmd.exe	34
PID 2736 wrote to memory of 1700	2736	cmd.exe	34
PID 1700 wrote to memory of 2396	1700	blockport.exe	60
PID 1700 wrote to memory of 2396	1700	blockport.exe	60
PID 1700 wrote to memory of 2396	1700	blockport.exe	60

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\150550DF367F8D6334843DEEE8DE66A3.exe
"C:\Users\Admin\AppData\Local\Temp\150550DF367F8D6334843DEEE8DE66A3.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2832
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontrefPerfmonitor\C7WmfIuC8zQxx.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2320
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\FontrefPerfmonitor\6xajXYt4OYp.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2736
  - - C:\FontrefPerfmonitor\blockport.exe
      "C:\FontrefPerfmonitor\blockport.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1700
    - - C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe
        
        "C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:2396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:\Users\Default User\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\Default User\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2580

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Windows\Downloaded Program Files\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\Downloaded Program Files\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\Windows\Downloaded Program Files\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Users\Default User\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 13 /tr "'C:\FontrefPerfmonitor\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\FontrefPerfmonitor\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 7 /tr "'C:\FontrefPerfmonitor\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 12 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 13 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:\Windows\Microsoft.NET\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\Microsoft.NET\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 14 /tr "'C:\Windows\Microsoft.NET\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1268

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2996

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

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:\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/1700-13-0x0000000000200000-0x00000000002D6000-memory.dmp

Filesize
856KB

Download
memory/2396-36-0x0000000001310000-0x00000000013E6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads