dcrat | 854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af

General

Target

854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.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 4 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	2052	1128	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4508	1128	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1576	1128	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2336	1128	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000b000000023b8f-15.dat	dcrat
behavioral2/memory/3240-34-0x0000000000450000-0x00000000004E6000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	savesbrokerDriverSavesbroker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe

Executes dropped EXE 3 IoCs

pid	Process
3240	savesbrokerDriverSavesbroker.exe
1964	FPS Booster 2.0.7.exe
3576	sysmon.exe

Loads dropped DLL 2 IoCs

pid	Process
1964	FPS Booster 2.0.7.exe
1964	FPS Booster 2.0.7.exe

Adds Run key to start application 2 TTPs 4 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\System = "\"C:\\Recovery\\WindowsRE\\System.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:\\Documents and Settings\\TextInputHost.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\RestartNowPower_80.contrast-white\\lsass.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\Windows\\SysmonDrv\\sysmon.exe\""	savesbrokerDriverSavesbroker.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\System32\RestartNowPower_80.contrast-white\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\RestartNowPower_80.contrast-white\lsass.exe	savesbrokerDriverSavesbroker.exe
File opened for modification	C:\Windows\System32\RestartNowPower_80.contrast-white\lsass.exe	savesbrokerDriverSavesbroker.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4792 set thread context of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysmonDrv\sysmon.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\SysmonDrv\121e5b5079f7c0e46d90f99b3864022518bbbda9	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

pid	pid_target	Process	procid_target
4860	4792	WerFault.exe	81

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	FPS Booster 2.0.7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	savesbrokerDriverSavesbroker.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2052	schtasks.exe
4508	schtasks.exe
1576	schtasks.exe
2336	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3240	savesbrokerDriverSavesbroker.exe
3576	sysmon.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
Token: SeDebugPrivilege	3240	savesbrokerDriverSavesbroker.exe
Token: SeDebugPrivilege	3576	sysmon.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4792 wrote to memory of 4432	4792	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	82
PID 4432 wrote to memory of 3240	4432	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	85
PID 4432 wrote to memory of 3240	4432	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	85
PID 4432 wrote to memory of 1964	4432	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	86
PID 4432 wrote to memory of 1964	4432	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	86
PID 4432 wrote to memory of 1964	4432	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	86
PID 3240 wrote to memory of 2848	3240	savesbrokerDriverSavesbroker.exe	93
PID 3240 wrote to memory of 2848	3240	savesbrokerDriverSavesbroker.exe	93
PID 2848 wrote to memory of 2376	2848	cmd.exe	95
PID 2848 wrote to memory of 2376	2848	cmd.exe	95
PID 2848 wrote to memory of 4736	2848	cmd.exe	96
PID 2848 wrote to memory of 4736	2848	cmd.exe	96
PID 2848 wrote to memory of 3576	2848	cmd.exe	100
PID 2848 wrote to memory of 3576	2848	cmd.exe	100

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\854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
"C:\Users\Admin\AppData\Local\Temp\854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4792
- C:\Users\Admin\AppData\Local\Temp\854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
  "C:\Users\Admin\AppData\Local\Temp\854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4432
- - 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 Windows directory
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3240
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\wVchVVrtg1.bat"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2848
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:2376
    - - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        
        PID:4736
    - - C:\Windows\SysmonDrv\sysmon.exe
        
        "C:\Windows\SysmonDrv\sysmon.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3576
- - 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:1964
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4792 -s 956
  2⤵
  - Program crash
  PID:4860

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4792 -ip 4792
1⤵
PID:3584

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\RestartNowPower_80.contrast-white\lsass.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 "sysmon" /sc ONLOGON /tr "'C:\Windows\SysmonDrv\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4508

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:1576

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Documents and Settings\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2336

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\nso8415.tmp\System.dll

Filesize
11KB

MD5
bf712f32249029466fa86756f5546950

SHA1
75ac4dc4808ac148ddd78f6b89a51afbd4091c2e

SHA256
7851cb12fa4131f1fee5de390d650ef65cac561279f1cfe70ad16cc9780210af

SHA512
13f69959b28416e0b8811c962a49309dca3f048a165457051a28a3eb51377dcaf99a15e86d7eee8f867a9e25ecf8c44da370ac8f530eeae7b5252eaba64b96f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nso8415.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
C:\Users\Admin\AppData\Local\Temp\wVchVVrtg1.bat

Filesize
207B

MD5
b5782cf4ca8b8279031a712a21b7aee7

SHA1
98c300e07b7d7ee1cb70d3ea505c07bf8b28e927

SHA256
d07ab3aad6c23858ef56f6a9015bff21bb0b9668af0e69dcabdda564795afc06

SHA512
c221865d55a84e64ce7dfbbf43ee120cd644c3c25243a276a32ff50d2ec40f0f5186101b3cb51265fcccc9a55f987fd8830223fa4c10e5afd02f067b615eaaf7

Download Submit
memory/3240-38-0x00007FF82BE50000-0x00007FF82C911000-memory.dmp

Filesize
10.8MB

Download
memory/3240-64-0x00007FF82BE50000-0x00007FF82C911000-memory.dmp

Filesize
10.8MB

Download
memory/3240-32-0x00007FF82BE53000-0x00007FF82BE55000-memory.dmp

Filesize
8KB

Download
memory/3240-34-0x0000000000450000-0x00000000004E6000-memory.dmp

Filesize
600KB

Download
memory/3576-70-0x0000000002710000-0x000000000271A000-memory.dmp

Filesize
40KB

Download
memory/3576-69-0x0000000000F40000-0x0000000000F4C000-memory.dmp

Filesize
48KB

Download
memory/4432-10-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/4432-6-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/4432-8-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/4432-33-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/4792-5-0x0000000005860000-0x0000000005E04000-memory.dmp

Filesize
5.6MB

Download
memory/4792-3-0x00000000752E0000-0x0000000075A90000-memory.dmp

Filesize
7.7MB

Download
memory/4792-2-0x0000000005050000-0x00000000050EC000-memory.dmp

Filesize
624KB

Download
memory/4792-52-0x00000000752E0000-0x0000000075A90000-memory.dmp

Filesize
7.7MB

Download
memory/4792-0-0x00000000752EE000-0x00000000752EF000-memory.dmp

Filesize
4KB

Download
memory/4792-1-0x0000000000460000-0x000000000057A000-memory.dmp

Filesize
1.1MB

Download
memory/4792-4-0x00000000050F0000-0x00000000051B4000-memory.dmp

Filesize
784KB

Download
memory/4792-9-0x0000000004F90000-0x0000000004F98000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads