dcrat | 854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af

General

Target

1C40D9E61FBBD5D9054638B98B10E1CF.exe
Size

1.1MB
MD5

1c40d9e61fbbd5d9054638b98b10e1cf
SHA1

145119e649cabc6c60200643b3cc347fc4b164cc
SHA256

854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af
SHA512

970eade0dce9dfaf5acdaf88721e55071fc48c4570c9a9b78c875d81fba54b047aed93412e331466a461662e065020f189b1dc1ec324b9394dd531ab2e3b3cf1
SSDEEP

24576:TE9h8YY4mB7WnMSTdTvX+5pdKj30HZQHEGP:TeGYDmBcBpvEpdKj3W/i

Score

10^/10

dcrat discovery infostealer persistence 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 7 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3252	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	664	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5108	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2364	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3412	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	952	216	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	544	216	schtasks.exe	91

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/files/0x0008000000023c84-15.dat	dcrat
behavioral2/memory/2356-30-0x0000000000130000-0x00000000001C6000-memory.dmp	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

Processes:

1C40D9E61FBBD5D9054638B98B10E1CF.exesavesbrokerDriverSavesbroker.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	1C40D9E61FBBD5D9054638B98B10E1CF.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	savesbrokerDriverSavesbroker.exe

Executes dropped EXE 3 IoCs

Processes:

savesbrokerDriverSavesbroker.exeFPS Booster 2.0.7.exedwm.exe

pid	Process
2356	savesbrokerDriverSavesbroker.exe
1312	FPS Booster 2.0.7.exe
4964	dwm.exe

Loads dropped DLL 2 IoCs

Processes:

FPS Booster 2.0.7.exe

pid	Process
1312	FPS Booster 2.0.7.exe
1312	FPS Booster 2.0.7.exe

Adds Run key to start application 2 TTPs 7 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

savesbrokerDriverSavesbroker.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\eapputil\\dllhost.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sihost = "\"C:\\Windows\\System32\\ChatApis\\sihost.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:\\Windows\\SystemApps\\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\\InputApp\\TextInput\\TextInputHost.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Program Files (x86)\\Windows Portable Devices\\Idle.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\PackageStateChangeHandler\\RuntimeBroker.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\ProgramData\\Start Menu\\dwm.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\PerfLogs\\sysmon.exe\""	savesbrokerDriverSavesbroker.exe

Drops file in System32 directory 7 IoCs

Processes:

savesbrokerDriverSavesbroker.exe

description	ioc	Process
File created	C:\Windows\System32\ChatApis\66fc9ff0ee96c2b21f0cfded48750ae9e3032bf3	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\PackageStateChangeHandler\RuntimeBroker.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\PackageStateChangeHandler\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\eapputil\dllhost.exe	savesbrokerDriverSavesbroker.exe
File opened for modification	C:\Windows\System32\eapputil\dllhost.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\eapputil\5940a34987c99120d96dace90a3f93f329dcad63	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\ChatApis\sihost.exe	savesbrokerDriverSavesbroker.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

1C40D9E61FBBD5D9054638B98B10E1CF.exe

description	pid	Process	procid_target
PID 1608 set thread context of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85

Drops file in Program Files directory 2 IoCs

Processes:

savesbrokerDriverSavesbroker.exe

description	ioc	Process
File created	C:\Program Files (x86)\Windows Portable Devices\Idle.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Program Files (x86)\Windows Portable Devices\6ccacd8608530fba3a93e87ae2225c7032aa18c1	savesbrokerDriverSavesbroker.exe

Drops file in Windows directory 2 IoCs

Processes:

savesbrokerDriverSavesbroker.exe

description	ioc	Process
File created	C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInput\TextInputHost.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInput\22eafd247d37c30fed3795ee41d259ec72bb351c	savesbrokerDriverSavesbroker.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
3160	1608	WerFault.exe	84

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

Processes:

1C40D9E61FBBD5D9054638B98B10E1CF.exe1C40D9E61FBBD5D9054638B98B10E1CF.exeFPS Booster 2.0.7.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1C40D9E61FBBD5D9054638B98B10E1CF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1C40D9E61FBBD5D9054638B98B10E1CF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	FPS Booster 2.0.7.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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
544	schtasks.exe
3252	schtasks.exe
664	schtasks.exe
5108	schtasks.exe
2364	schtasks.exe
3412	schtasks.exe
952	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

savesbrokerDriverSavesbroker.exedwm.exe

pid	Process
2356	savesbrokerDriverSavesbroker.exe
2356	savesbrokerDriverSavesbroker.exe
2356	savesbrokerDriverSavesbroker.exe
4964	dwm.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

1C40D9E61FBBD5D9054638B98B10E1CF.exesavesbrokerDriverSavesbroker.exedwm.exe

description	pid	Process
Token: SeDebugPrivilege	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe
Token: SeDebugPrivilege	2356	savesbrokerDriverSavesbroker.exe
Token: SeDebugPrivilege	4964	dwm.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

1C40D9E61FBBD5D9054638B98B10E1CF.exe1C40D9E61FBBD5D9054638B98B10E1CF.exesavesbrokerDriverSavesbroker.exe

description	pid	Process	procid_target
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1608 wrote to memory of 1376	1608	1C40D9E61FBBD5D9054638B98B10E1CF.exe	85
PID 1376 wrote to memory of 2356	1376	1C40D9E61FBBD5D9054638B98B10E1CF.exe	86
PID 1376 wrote to memory of 2356	1376	1C40D9E61FBBD5D9054638B98B10E1CF.exe	86
PID 1376 wrote to memory of 1312	1376	1C40D9E61FBBD5D9054638B98B10E1CF.exe	87
PID 1376 wrote to memory of 1312	1376	1C40D9E61FBBD5D9054638B98B10E1CF.exe	87
PID 1376 wrote to memory of 1312	1376	1C40D9E61FBBD5D9054638B98B10E1CF.exe	87
PID 2356 wrote to memory of 4964	2356	savesbrokerDriverSavesbroker.exe	99
PID 2356 wrote to memory of 4964	2356	savesbrokerDriverSavesbroker.exe	99

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\1C40D9E61FBBD5D9054638B98B10E1CF.exe
"C:\Users\Admin\AppData\Local\Temp\1C40D9E61FBBD5D9054638B98B10E1CF.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1608
- C:\Users\Admin\AppData\Local\Temp\1C40D9E61FBBD5D9054638B98B10E1CF.exe
  "C:\Users\Admin\AppData\Local\Temp\1C40D9E61FBBD5D9054638B98B10E1CF.exe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1376
- - C:\Users\Admin\AppData\Local\Temp\savesbrokerDriverSavesbroker.exe
    "C:\Users\Admin\AppData\Local\Temp\savesbrokerDriverSavesbroker.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - Drops file in Windows directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2356
  - - C:\ProgramData\Start Menu\dwm.exe
      "C:\ProgramData\Start Menu\dwm.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4964
- - C:\Users\Admin\AppData\Local\Temp\FPS Booster 2.0.7.exe
    "C:\Users\Admin\AppData\Local\Temp\FPS Booster 2.0.7.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    PID:1312
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1608 -s 952
  2⤵
  - Program crash
  PID:3160

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1608 -ip 1608
1⤵
PID:1632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\eapputil\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\ChatApis\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInput\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5108

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\PackageStateChangeHandler\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3412

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\ProgramData\Start Menu\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\PerfLogs\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:544

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\FPS Booster 2.0.7.exe

Filesize
429KB

MD5
74be806e27a351565f2ec136dcb5232c

SHA1
0ec9fc48c5c290014958c05940bc340eed942e15

SHA256
33b5e6ff81c482b3b62f8ed847fd25e39724dc6eb6c2a3881b1004dc75c170b6

SHA512
0ece93924e569718eb7dca19474f2cde1199bac8ead206a01a65dcf33e7718fcc7c668d6d891dd164f011ae9fb53272003bbc5db54ebe6de62c3b01d4986dd4d

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsiC015.tmp\System.dll

Filesize
11KB

MD5
bf712f32249029466fa86756f5546950

SHA1
75ac4dc4808ac148ddd78f6b89a51afbd4091c2e

SHA256
7851cb12fa4131f1fee5de390d650ef65cac561279f1cfe70ad16cc9780210af

SHA512
13f69959b28416e0b8811c962a49309dca3f048a165457051a28a3eb51377dcaf99a15e86d7eee8f867a9e25ecf8c44da370ac8f530eeae7b5252eaba64b96f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsiC015.tmp\nsDialogs.dll

Filesize
9KB

MD5
4ccc4a742d4423f2f0ed744fd9c81f63

SHA1
704f00a1acc327fd879cf75fc90d0b8f927c36bc

SHA256
416133dd86c0dff6b0fcaf1f46dfe97fdc85b37f90effb2d369164a8f7e13ae6

SHA512
790c5eb1f8b297e45054c855b66dfc18e9f3f1b1870559014dbefa3b9d5b6d33a993a9e089202e70f51a55d859b74e8605c6f633386fd9189b6f78941bf1bfdb

Download Submit
C:\Users\Admin\AppData\Local\Temp\savesbrokerDriverSavesbroker.exe

Filesize
572KB

MD5
222edc84e2d32948f2639554b23e7b04

SHA1
22cedf83a69b08259db3c2f3618df067dd7c7522

SHA256
55ab1b21734f31815058fa1e2841e8b62e6e4f04e635a4b51ebea3fde646e920

SHA512
95dd51cf8be6461955b867b853d58eab7bf6ac363e9f99f5c8c8f13046daa373ed845db3531e9f765515e43f8955955ec4ea83f19807a2b3c04f2c1f6a0c6855

Download Submit
memory/1376-10-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/1376-34-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/1376-6-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/1376-8-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/1608-5-0x00000000059F0000-0x0000000005F94000-memory.dmp

Filesize
5.6MB

Download
memory/1608-2-0x00000000051E0000-0x000000000527C000-memory.dmp

Filesize
624KB

Download
memory/1608-0-0x00000000745BE000-0x00000000745BF000-memory.dmp

Filesize
4KB

Download
memory/1608-64-0x00000000745B0000-0x0000000074D60000-memory.dmp

Filesize
7.7MB

Download
memory/1608-9-0x00000000051A0000-0x00000000051A8000-memory.dmp

Filesize
32KB

Download
memory/1608-4-0x0000000005280000-0x0000000005344000-memory.dmp

Filesize
784KB

Download
memory/1608-3-0x00000000745B0000-0x0000000074D60000-memory.dmp

Filesize
7.7MB

Download
memory/1608-1-0x0000000000640000-0x000000000075A000-memory.dmp

Filesize
1.1MB

Download
memory/2356-30-0x0000000000130000-0x00000000001C6000-memory.dmp

Filesize
600KB

Download
memory/2356-35-0x00007FFAF29E0000-0x00007FFAF34A1000-memory.dmp

Filesize
10.8MB

Download
memory/2356-29-0x00007FFAF29E3000-0x00007FFAF29E5000-memory.dmp

Filesize
8KB

Download
memory/2356-77-0x00007FFAF29E0000-0x00007FFAF34A1000-memory.dmp

Filesize
10.8MB

Download
memory/4964-78-0x0000000001B00000-0x0000000001B0C000-memory.dmp

Filesize
48KB

Download
memory/4964-79-0x0000000001B10000-0x0000000001B1A000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads