dcrat | c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78

Analysis

max time kernel
18s
max time network
16s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08-01-2025 07:03

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General

Target

c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe
Size

1.3MB
MD5

f3041cba53d0b7300f3b4301f4debd38
SHA1

a629e35f972a00051cf86020f113be26ea95462c
SHA256

c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78
SHA512

8e285ceebeb6c3bde8cb240d3703b1d5744ca70d3b19ae6a44b03666293363a6122ab9dc58899693dda907c00813f09ee1d366901a1eea3dc15ea9ebfdd37c88
SSDEEP

24576:U2G/nvxW3Ww0t6TnzGmVBDh4+aknuRRZJND0gFJ4rD/IjCR:UbA30GnzV/q+DnsXg3

Score

10^/10

dcrat discovery execution 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 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	2760	2664	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	984	2664	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2668	2664	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2536	2664	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2556	2664	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	2664	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000018bf3-10.dat	dcrat
behavioral1/memory/2792-13-0x0000000000DD0000-0x0000000000EE0000-memory.dmp	dcrat
behavioral1/memory/1704-45-0x0000000000D70000-0x0000000000E80000-memory.dmp	dcrat

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2580	powershell.exe
2528	powershell.exe
2560	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2792	DllCommonsvc.exe
1704	spoolsv.exe

Loads dropped DLL 2 IoCs

pid	Process
864	cmd.exe
864	cmd.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\AppCompat\Programs\spoolsv.exe	DllCommonsvc.exe
File opened for modification	C:\Windows\AppCompat\Programs\spoolsv.exe	DllCommonsvc.exe
File created	C:\Windows\AppCompat\Programs\f3b6ecef712a24	DllCommonsvc.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.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
2760	schtasks.exe
984	schtasks.exe
2668	schtasks.exe
2536	schtasks.exe
2556	schtasks.exe
2508	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2792	DllCommonsvc.exe
2560	powershell.exe
2580	powershell.exe
2528	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2792	DllCommonsvc.exe
Token: SeDebugPrivilege	2560	powershell.exe
Token: SeDebugPrivilege	2580	powershell.exe
Token: SeDebugPrivilege	2528	powershell.exe
Token: SeDebugPrivilege	1704	spoolsv.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2388	2280	c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe	30
PID 2280 wrote to memory of 2388	2280	c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe	30
PID 2280 wrote to memory of 2388	2280	c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe	30
PID 2280 wrote to memory of 2388	2280	c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe	30
PID 2388 wrote to memory of 864	2388	WScript.exe	31
PID 2388 wrote to memory of 864	2388	WScript.exe	31
PID 2388 wrote to memory of 864	2388	WScript.exe	31
PID 2388 wrote to memory of 864	2388	WScript.exe	31
PID 864 wrote to memory of 2792	864	cmd.exe	33
PID 864 wrote to memory of 2792	864	cmd.exe	33
PID 864 wrote to memory of 2792	864	cmd.exe	33
PID 864 wrote to memory of 2792	864	cmd.exe	33
PID 2792 wrote to memory of 2528	2792	DllCommonsvc.exe	41
PID 2792 wrote to memory of 2528	2792	DllCommonsvc.exe	41
PID 2792 wrote to memory of 2528	2792	DllCommonsvc.exe	41
PID 2792 wrote to memory of 2560	2792	DllCommonsvc.exe	42
PID 2792 wrote to memory of 2560	2792	DllCommonsvc.exe	42
PID 2792 wrote to memory of 2560	2792	DllCommonsvc.exe	42
PID 2792 wrote to memory of 2580	2792	DllCommonsvc.exe	43
PID 2792 wrote to memory of 2580	2792	DllCommonsvc.exe	43
PID 2792 wrote to memory of 2580	2792	DllCommonsvc.exe	43
PID 2792 wrote to memory of 288	2792	DllCommonsvc.exe	47
PID 2792 wrote to memory of 288	2792	DllCommonsvc.exe	47
PID 2792 wrote to memory of 288	2792	DllCommonsvc.exe	47
PID 288 wrote to memory of 1244	288	cmd.exe	49
PID 288 wrote to memory of 1244	288	cmd.exe	49
PID 288 wrote to memory of 1244	288	cmd.exe	49
PID 288 wrote to memory of 1704	288	cmd.exe	51
PID 288 wrote to memory of 1704	288	cmd.exe	51
PID 288 wrote to memory of 1704	288	cmd.exe	51

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\c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe
"C:\Users\Admin\AppData\Local\Temp\c9fb18f99fe5ec760114c23a3645ceba3686687e88a795031ae982f51e657c78.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2388
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\providercommon\1zu9dW.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:864
  - - C:\providercommon\DllCommonsvc.exe
      "C:\providercommon\DllCommonsvc.exe"
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2792
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\providercommon\DllCommonsvc.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2528
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\AppCompat\Programs\spoolsv.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2560
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\providercommon\taskhost.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2580
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\yAg1i3HYFu.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:288
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1244
      - C:\Windows\AppCompat\Programs\spoolsv.exe
        
        "C:\Windows\AppCompat\Programs\spoolsv.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:1704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Windows\AppCompat\Programs\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\AppCompat\Programs\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Windows\AppCompat\Programs\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 8 /tr "'C:\providercommon\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2536

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\providercommon\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 6 /tr "'C:\providercommon\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2508

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\yAg1i3HYFu.bat

Filesize
206B

MD5
7aaf7c1b7238a1f98e337d0115e065c7

SHA1
263c4b02b480237838ed7c7b2d3f66cfe6eb076c

SHA256
6642a18b8335328f067794d0e3e49846ef77664ea29c8c79d2cd86a36a540fab

SHA512
9901f63effc55c149e9ec3c8046ce881b17ae104b9abbaa6dcabc017aecc479e1c76d2eef2d0d1f9da2b12505fa0cafc2c2bd5a1f4f64160888f16995f09ed3f

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
22f706c37b7f5431a32ee8963019396d

SHA1
8d5462519a1608ed0669aba217429e6899e5ad5b

SHA256
9533c1e7ec34f18140e9449079f14f6dda8bc1cf97c6dccb722afb8056331553

SHA512
b7804585241bdfe595652d30b18c1d127d3763c733090356dcf78aae9150ddb80c82b5ce99d870572cb18edfe0b4b4df526c5372398c9f6752ceabd7f9f54ad0

Download Submit
C:\providercommon\1zu9dW.bat

Filesize
36B

MD5
6783c3ee07c7d151ceac57f1f9c8bed7

SHA1
17468f98f95bf504cc1f83c49e49a78526b3ea03

SHA256
8ab782f0f327a2021530e7230d3aee8abbecb7eed59482a3a46e78b9e3862322

SHA512
c6012d4bfac1ed14d0fd9f0eabd0e1c3d647b343db292a907b246271d52a4b7469c809db43910ddba2e8c5045f9cb3d24d0af62d363281e6cb8b39ee94a183e8

Download Submit
C:\providercommon\DllCommonsvc.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe

Filesize
197B

MD5
8088241160261560a02c84025d107592

SHA1
083121f7027557570994c9fc211df61730455bb5

SHA256
2072cc9a4a3b84d4c5178ab41c5588eea7d0103e3928e34d64f17bf97f3d1cc1

SHA512
20d9369dd359315848ea30144383a0bb479d86059fdbc3b3256ac84f998193512feb3b1799ab663619920c99fe7e0ebba33ada31a3855094b956fcd351c90478

Download Submit
memory/1704-45-0x0000000000D70000-0x0000000000E80000-memory.dmp

Filesize
1.1MB

Download
memory/2560-42-0x00000000028F0000-0x00000000028F8000-memory.dmp

Filesize
32KB

Download
memory/2580-40-0x000000001B760000-0x000000001BA42000-memory.dmp

Filesize
2.9MB

Download
memory/2792-13-0x0000000000DD0000-0x0000000000EE0000-memory.dmp

Filesize
1.1MB

Download
memory/2792-17-0x0000000000180000-0x000000000018C000-memory.dmp

Filesize
48KB

Download
memory/2792-16-0x0000000000160000-0x000000000016C000-memory.dmp

Filesize
48KB

Download
memory/2792-15-0x0000000000170000-0x000000000017C000-memory.dmp

Filesize
48KB

Download
memory/2792-14-0x0000000000150000-0x0000000000162000-memory.dmp

Filesize
72KB

Download