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 6 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	2020	1468	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4936	1468	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3440	1468	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3300	1468	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	8	1468	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1220	1468	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000c000000023b5a-15.dat	dcrat
behavioral2/memory/4908-34-0x0000000000F00000-0x0000000000F96000-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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	savesbrokerDriverSavesbroker.exe

Executes dropped EXE 3 IoCs

pid	Process
4908	savesbrokerDriverSavesbroker.exe
3424	FPS Booster 2.0.7.exe
712	RuntimeBroker.exe

Loads dropped DLL 2 IoCs

pid	Process
3424	FPS Booster 2.0.7.exe
3424	FPS Booster 2.0.7.exe

Adds Run key to start application 2 TTPs 6 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\sysmon = "\"C:\\Windows\\PFRO\\sysmon.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Recovery\\WindowsRE\\RuntimeBroker.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files (x86)\\Reference Assemblies\\Microsoft\\Framework\\v3.0\\de\\csrss.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\Windows.Security.Integrity\\RuntimeBroker.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\savesbrokerDriverSavesbroker = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\msedge_installer\\savesbrokerDriverSavesbroker.exe\""	savesbrokerDriverSavesbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Program Files\\Windows Defender\\en-US\\sppsvc.exe\""	savesbrokerDriverSavesbroker.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\Windows.Security.Integrity\RuntimeBroker.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\System32\Windows.Security.Integrity\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	savesbrokerDriverSavesbroker.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1852 set thread context of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\csrss.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\886983d96e3d3e31032c679b2d4ea91b6c05afef	savesbrokerDriverSavesbroker.exe
File created	C:\Program Files\Windows Defender\en-US\sppsvc.exe	savesbrokerDriverSavesbroker.exe
File created	C:\Program Files\Windows Defender\en-US\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	savesbrokerDriverSavesbroker.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\PFRO\121e5b5079f7c0e46d90f99b3864022518bbbda9	savesbrokerDriverSavesbroker.exe
File created	C:\Windows\PFRO\sysmon.exe	savesbrokerDriverSavesbroker.exe
File opened for modification	C:\Windows\PFRO\sysmon.exe	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
2388	1852	WerFault.exe	82

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

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
8	schtasks.exe
1220	schtasks.exe
2020	schtasks.exe
4936	schtasks.exe
3440	schtasks.exe
3300	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4908	savesbrokerDriverSavesbroker.exe
4908	savesbrokerDriverSavesbroker.exe
4908	savesbrokerDriverSavesbroker.exe
712	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe
Token: SeDebugPrivilege	4908	savesbrokerDriverSavesbroker.exe
Token: SeDebugPrivilege	712	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 1852 wrote to memory of 2028	1852	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	83
PID 2028 wrote to memory of 4908	2028	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	87
PID 2028 wrote to memory of 4908	2028	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	87
PID 2028 wrote to memory of 3424	2028	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	88
PID 2028 wrote to memory of 3424	2028	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	88
PID 2028 wrote to memory of 3424	2028	854b586f8d0cad52a042ccee32691dc9c30e6a32bd3805024934f43e169325af.exe	88
PID 4908 wrote to memory of 712	4908	savesbrokerDriverSavesbroker.exe	96
PID 4908 wrote to memory of 712	4908	savesbrokerDriverSavesbroker.exe	96

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:1852
- 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:2028
- - 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:4908
  - - C:\Windows\System32\Windows.Security.Integrity\RuntimeBroker.exe
      "C:\Windows\System32\Windows.Security.Integrity\RuntimeBroker.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:712
- - 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:3424
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1852 -s 952
  2⤵
  - Program crash
  PID:2388

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1852 -ip 1852
1⤵
PID:2000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\PFRO\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\de\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\Windows.Security.Integrity\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "savesbrokerDriverSavesbroker" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\msedge_installer\savesbrokerDriverSavesbroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:8

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Windows Defender\en-US\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1220

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\nsj9144.tmp\System.dll

Filesize
11KB

MD5
bf712f32249029466fa86756f5546950

SHA1
75ac4dc4808ac148ddd78f6b89a51afbd4091c2e

SHA256
7851cb12fa4131f1fee5de390d650ef65cac561279f1cfe70ad16cc9780210af

SHA512
13f69959b28416e0b8811c962a49309dca3f048a165457051a28a3eb51377dcaf99a15e86d7eee8f867a9e25ecf8c44da370ac8f530eeae7b5252eaba64b96f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsj9144.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/712-74-0x000000001B780000-0x000000001B78A000-memory.dmp

Filesize
40KB

Download
memory/712-73-0x000000001B770000-0x000000001B77C000-memory.dmp

Filesize
48KB

Download
memory/1852-2-0x0000000004D50000-0x0000000004DEC000-memory.dmp

Filesize
624KB

Download
memory/1852-5-0x0000000005560000-0x0000000005B04000-memory.dmp

Filesize
5.6MB

Download
memory/1852-9-0x00000000027E0000-0x00000000027E8000-memory.dmp

Filesize
32KB

Download
memory/1852-4-0x0000000004DF0000-0x0000000004EB4000-memory.dmp

Filesize
784KB

Download
memory/1852-0-0x00000000746EE000-0x00000000746EF000-memory.dmp

Filesize
4KB

Download
memory/1852-3-0x00000000746E0000-0x0000000074E90000-memory.dmp

Filesize
7.7MB

Download
memory/1852-49-0x00000000746E0000-0x0000000074E90000-memory.dmp

Filesize
7.7MB

Download
memory/1852-1-0x00000000001E0000-0x00000000002FA000-memory.dmp

Filesize
1.1MB

Download
memory/2028-10-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/2028-32-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/2028-8-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/2028-6-0x0000000000400000-0x00000000004C5000-memory.dmp

Filesize
788KB

Download
memory/4908-34-0x0000000000F00000-0x0000000000F96000-memory.dmp

Filesize
600KB

Download
memory/4908-30-0x00007FFD67273000-0x00007FFD67275000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads