dcrat | e54e6afbb7aef8a09455ad1c546fda176e67037fe95869bb1d0967db2d937617

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/01/2025, 04:11

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General

Target
7a34fd70f9aaf568795500ef7481687e.exe
Size 2.6MB
Sample250102-erxt5asnew
SHA256 e54e6afbb7aef8a09455ad1c546fda176e67037fe95869bb1d0967db2d937617
MD5 7a34fd70f9aaf568795500ef7481687e
SHA1 96a77428eb50cacab16202f171b6903bcd736e64
SHA512 2c689bae167b0e4b20fba5cb31f4dbf0cb851a240c3645f422c8f05a49fae97436ef69b383753aa86742477ed8da5d5392fa790e7abe93ff2c57dc06fd62a9f7
SSDEEP 49152:ubA3juOjdB7VDb7/xJACAXTTrTlo3KU9VM2LNn:ubiRB7VDH/fP2rRo3M2LNn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat discovery 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 9 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	3456	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4940	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	780	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1676	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3000	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3136	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1352	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2196	2344	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3864	2344	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0008000000023bb7-10.dat	dcrat
behavioral2/memory/4476-13-0x0000000000A00000-0x0000000000C4A000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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	7a34fd70f9aaf568795500ef7481687e.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	comdll.exe

Executes dropped EXE 2 IoCs

pid	Process
4476	comdll.exe
1128	spoolsv.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
22	ipinfo.io
23	ipinfo.io

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Common Files\spoolsv.exe	comdll.exe
File opened for modification	C:\Program Files (x86)\Common Files\spoolsv.exe	comdll.exe
File created	C:\Program Files (x86)\Common Files\f3b6ecef712a24	comdll.exe
File created	C:\Program Files\ModifiableWindowsApps\RuntimeBroker.exe	comdll.exe
File created	C:\Program Files\Windows Sidebar\Gadgets\sysmon.exe	comdll.exe
File created	C:\Program Files\Windows Sidebar\Gadgets\121e5b5079f7c0	comdll.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	7a34fd70f9aaf568795500ef7481687e.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	7a34fd70f9aaf568795500ef7481687e.exe
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	comdll.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4940	schtasks.exe
2196	schtasks.exe
3864	schtasks.exe
3456	schtasks.exe
780	schtasks.exe
1676	schtasks.exe
3000	schtasks.exe
3136	schtasks.exe
1352	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
4476	comdll.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe
1128	spoolsv.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1128	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4476	comdll.exe
Token: SeDebugPrivilege	1128	spoolsv.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1520 wrote to memory of 220	1520	7a34fd70f9aaf568795500ef7481687e.exe	82
PID 1520 wrote to memory of 220	1520	7a34fd70f9aaf568795500ef7481687e.exe	82
PID 1520 wrote to memory of 220	1520	7a34fd70f9aaf568795500ef7481687e.exe	82
PID 220 wrote to memory of 3256	220	WScript.exe	83
PID 220 wrote to memory of 3256	220	WScript.exe	83
PID 220 wrote to memory of 3256	220	WScript.exe	83
PID 3256 wrote to memory of 4476	3256	cmd.exe	85
PID 3256 wrote to memory of 4476	3256	cmd.exe	85
PID 4476 wrote to memory of 2372	4476	comdll.exe	96
PID 4476 wrote to memory of 2372	4476	comdll.exe	96
PID 2372 wrote to memory of 1964	2372	cmd.exe	98
PID 2372 wrote to memory of 1964	2372	cmd.exe	98
PID 2372 wrote to memory of 1128	2372	cmd.exe	102
PID 2372 wrote to memory of 1128	2372	cmd.exe	102

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\7a34fd70f9aaf568795500ef7481687e.exe
"C:\Users\Admin\AppData\Local\Temp\7a34fd70f9aaf568795500ef7481687e.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1520
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockSurrogateServerref\dgJVBcBuQvMObcs.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:220
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\blockSurrogateServerref\JMo9q0kcHiaTG6PDHGxFRU1HETIk.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3256
  - - C:\blockSurrogateServerref\comdll.exe
      "C:\blockSurrogateServerref\comdll.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4476
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\qK9JvzzoEm.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2372
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1964
      - C:\Program Files (x86)\Common Files\spoolsv.exe
        
        "C:\Program Files (x86)\Common Files\spoolsv.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1128

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Common Files\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files (x86)\Common Files\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Common Files\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3136

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Sidebar\Gadgets\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Program Files\Windows Sidebar\Gadgets\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2196

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Sidebar\Gadgets\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

qK9JvzzoEm.bat

Path C:\Users\Admin\AppData\Local\Temp\qK9JvzzoEm.bat
Size 212B
SHA256 fecfa6d4ba3f254e2dd9344478ad594ad48ef3c6d53f3f335ddb33e24cd0e579
MD5 aada3b69327e0d3896a0d5e13092680f
SHA1 61abb893d39f13e84f16652178bba7378ca92908
SHA512 11952077d34ba5b92ca555d5f76941d09f1da26c14e875cfa1b52a62a02ebf9c7c5d4d031e87ae4744c59c16debf22280cbd39bb3676ed6309449af25daf5aa4
MD5 SHA1 SHA512

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JMo9q0kcHiaTG6PDHGxFRU1HETIk.bat

Path C:\blockSurrogateServerref\JMo9q0kcHiaTG6PDHGxFRU1HETIk.bat
Size 39B
SHA256 613141fb9336f992ecc0fd895fb04b7b2776022e9274e90dbbdbbae4b4aa647b
MD5 fc6f56372200d0f5198a608c88337a25
SHA1 1b55fc2ea6fe0a4524202c37349333951f9ed404
SHA512 7d7cedcf8578eed9b2f12f60ca8c20fb2ae88365ed02967716188a9dd09ddb3821a4411ee8d37e0927e7fa759ef60ac8191cf16b7f8ffe457ea15d3d9ca66216
MD5 SHA1 SHA512

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comdll.exe

Path C:\blockSurrogateServerref\comdll.exe
Size 2.3MB
SHA256 492986fe3adc7bbbeb8a6c4a542fd4f555bb8a05b95e5768d2322c41ddac4886
MD5 98bc76700770c6e40c097065993de02a
SHA1 cf8dbb65771f6cd294c1417c42bf828daffd1a8f
SHA512 c212810090f2018b083d4cee3277a8f29177a3db4069c97821345bccb3506fc7faa957bb3d11387df416606b89633ad107f931d71562255ad6142e72076e1c2a
SSDEEP 49152:iOjdB7VDb7/xJACAXTTrTlo3KU9VM2LN:zRB7VDH/fP2rRo3M2LN
MD5 SHA1 SHA512 SSDEEP

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dgJVBcBuQvMObcs.vbe

Path C:\blockSurrogateServerref\dgJVBcBuQvMObcs.vbe
Size 225B
SHA256 61ccf4240a03621e197fc0e2c808bead052541a5af3360abf16f1110b839cbf0
MD5 5e9f3c9cdff0ebbc7bcddf471ff824ea
SHA1 589af233efbda892d7038d4da2aefaaefa18507f
SHA512 82236439c6c893f95f1badf33346741ed55996972bee589b2a5bcf2e1b98fbc55f0ce490760b8c9f9c6148c7e902d78bc5b046fd892051ab3eb847bbb6149c2a
MD5 SHA1 SHA512

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memory/1128-38-0x000000001DC50000-0x000000001E178000-memory.dmp

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memory/1128-37-0x000000001D250000-0x000000001D412000-memory.dmp

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memory/4476-17-0x000000001BE50000-0x000000001BEA6000-memory.dmp

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memory/4476-16-0x0000000002DA0000-0x0000000002DB6000-memory.dmp

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memory/4476-15-0x0000000002E00000-0x0000000002E50000-memory.dmp

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memory/4476-18-0x0000000002C60000-0x0000000002C6E000-memory.dmp

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memory/4476-19-0x0000000002DC0000-0x0000000002DCE000-memory.dmp

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memory/4476-20-0x0000000002DD0000-0x0000000002DD8000-memory.dmp

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memory/4476-21-0x0000000002DE0000-0x0000000002DE8000-memory.dmp

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memory/4476-14-0x0000000002D80000-0x0000000002D9C000-memory.dmp

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memory/4476-13-0x0000000000A00000-0x0000000000C4A000-memory.dmp

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memory/4476-12-0x00007FFCED2A3000-0x00007FFCED2A5000-memory.dmp

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