dcrat | 705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

General

Target

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Size

547KB
MD5

637920e868b2367c5e6517ee4744d3c9
SHA1

09f66f5db717cf9df695bb89d8e2643229379969
SHA256

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622
SHA512

92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443
SSDEEP

12288:xqnO30tV2lZu09sR2ia1OgdDG3cSIksYEkQlrBt:x+O3rvZDiUx5r

Score

10^/10

dcrat 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 8 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	4216	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3788	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4252	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	756	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2024	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1084	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3220	4460	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2168	4460	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4148-1-0x00000000002E0000-0x0000000000370000-memory.dmp	dcrat
behavioral2/files/0x0007000000023c72-11.dat	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Executes dropped EXE 1 IoCs

pid	Process
2636	csrss.exe

Adds Run key to start application 2 TTPs 8 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\taskhostw = "\"C:\\Windows\\System32\\elshyph\\taskhostw.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\computelibeventlog\\backgroundTaskHost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft_Windows_Desktop_Runtime_-_6.0.27_(x64)_20241007092158_003_windowsdesktop_runtime_6.0.27_win_x64.msi\\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhostw = "\"C:\\Recovery\\WindowsRE\\taskhostw.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sihost = "\"C:\\Windows\\System32\\windows.applicationmodel.conversationalagent.proxystub\\sihost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\Windows\\BitLockerDiscoveryVolumeContents\\sysmon.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Users\\All Users\\Microsoft\\Vault\\AC658CB4-9126-49BD-B877-31EEDAB3F204\\csrss.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Windows\\System32\\WMVENCOD\\SppExtComObj.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in System32 directory 8 IoCs

description	ioc	Process
File created	C:\Windows\System32\elshyph\taskhostw.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\elshyph\ea9f0e6c9e2dcd4dfacdaf29ba21541fb815a988	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\computelibeventlog\backgroundTaskHost.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\computelibeventlog\eddb19405b7ce1152b3e19997f2b467f0b72b3d3	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\windows.applicationmodel.conversationalagent.proxystub\sihost.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\windows.applicationmodel.conversationalagent.proxystub\66fc9ff0ee96c2b21f0cfded48750ae9e3032bf3	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\WMVENCOD\SppExtComObj.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\WMVENCOD\e1ef82546f0b02b7e974f28047f3788b1128cce1	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\BitLockerDiscoveryVolumeContents\sysmon.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\BitLockerDiscoveryVolumeContents\121e5b5079f7c0e46d90f99b3864022518bbbda9	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 8 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
756	schtasks.exe
2024	schtasks.exe
1084	schtasks.exe
3220	schtasks.exe
2168	schtasks.exe
4216	schtasks.exe
3788	schtasks.exe
4252	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
2636	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Token: SeDebugPrivilege	2636	csrss.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4148 wrote to memory of 2636	4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	92
PID 4148 wrote to memory of 2636	4148	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	92

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\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
"C:\Users\Admin\AppData\Local\Temp\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4148
- C:\Users\All Users\Microsoft\Vault\AC658CB4-9126-49BD-B877-31EEDAB3F204\csrss.exe
  "C:\Users\All Users\Microsoft\Vault\AC658CB4-9126-49BD-B877-31EEDAB3F204\csrss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\Microsoft_Windows_Desktop_Runtime_-_6.0.27_(x64)_20241007092158_003_windowsdesktop_runtime_6.0.27_win_x64.msi\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\windows.applicationmodel.conversationalagent.proxystub\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft\Vault\AC658CB4-9126-49BD-B877-31EEDAB3F204\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\WMVENCOD\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Windows\System32\elshyph\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\computelibeventlog\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2168

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\Microsoft\Vault\AC658CB4-9126-49BD-B877-31EEDAB3F204\csrss.exe

Filesize
547KB

MD5
637920e868b2367c5e6517ee4744d3c9

SHA1
09f66f5db717cf9df695bb89d8e2643229379969

SHA256
705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

SHA512
92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443

Download Submit
memory/2636-30-0x000000001AF80000-0x000000001AF8C000-memory.dmp

Filesize
48KB

Download
memory/2636-32-0x000000001AF90000-0x000000001AF9C000-memory.dmp

Filesize
48KB

Download
memory/2636-33-0x000000001AFA0000-0x000000001AFAE000-memory.dmp

Filesize
56KB

Download
memory/4148-0-0x00007FF98BF23000-0x00007FF98BF25000-memory.dmp

Filesize
8KB

Download
memory/4148-1-0x00000000002E0000-0x0000000000370000-memory.dmp

Filesize
576KB

Download
memory/4148-4-0x00007FF98BF20000-0x00007FF98C9E1000-memory.dmp

Filesize
10.8MB

Download
memory/4148-31-0x00007FF98BF20000-0x00007FF98C9E1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads