dcrat | c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3

Analysis

max time kernel
119s
max time network
125s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
25-11-2024 04:58

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General

Target

11DA048860021B6C22E171032E48B023.exe
Size

1.1MB
MD5

11da048860021b6c22e171032e48b023
SHA1

b3b636a8bd17223454b4522fdbdb4863e0c4a565
SHA256

c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3
SHA512

09b8bc3f1fa034d28a14e0fc5e44722ee84cfd9b32dc7887674100d967b3c9232d7ae42156c8d45050ea781ba87a3ee29a54bfc04bef98c6e5f6d9123444509f
SSDEEP

24576:U2G/nvxW3Ww0tpI7rd5XFM2cxARnZ0S/J1:UbA30pILXZjv

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 27 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	2660	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2692	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1072	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2224	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1032	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3012	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2228	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	392	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2360	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3032	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2956	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3008	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2232	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2740	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2016	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1664	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2004	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2104	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	756	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2040	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2324	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2408	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2444	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2468	1856	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1732	1856	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x000900000001660b-9.dat	dcrat
behavioral1/memory/1508-13-0x0000000000940000-0x0000000000A16000-memory.dmp	dcrat
behavioral1/memory/936-38-0x0000000001360000-0x0000000001436000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1508	chainMonitor.exe
936	Idle.exe

Loads dropped DLL 2 IoCs

pid	Process
2804	cmd.exe
2804	cmd.exe

Drops file in Program Files directory 12 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\Publisher\Backgrounds\886983d96e3d3e	chainMonitor.exe
File created	C:\Program Files (x86)\Windows Mail\conhost.exe	chainMonitor.exe
File created	C:\Program Files\VideoLAN\VLC\Idle.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\dwm.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Uninstall Information\b75386f1303e64	chainMonitor.exe
File created	C:\Program Files (x86)\Reference Assemblies\audiodg.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Reference Assemblies\42af1c969fbb7b	chainMonitor.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\6cb0b6c459d5d3	chainMonitor.exe
File created	C:\Program Files (x86)\Microsoft Office\CLIPART\Publisher\Backgrounds\csrss.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Windows Mail\088424020bedd6	chainMonitor.exe
File created	C:\Program Files\VideoLAN\VLC\6ccacd8608530f	chainMonitor.exe
File created	C:\Program Files (x86)\Uninstall Information\taskhost.exe	chainMonitor.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\TAPI\conhost.exe	chainMonitor.exe
File created	C:\Windows\TAPI\088424020bedd6	chainMonitor.exe
File created	C:\Windows\TAPI\conhost.exe	chainMonitor.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	11DA048860021B6C22E171032E48B023.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 27 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2224	schtasks.exe
3012	schtasks.exe
2740	schtasks.exe
2040	schtasks.exe
2408	schtasks.exe
3008	schtasks.exe
2360	schtasks.exe
2324	schtasks.exe
1732	schtasks.exe
2016	schtasks.exe
1032	schtasks.exe
392	schtasks.exe
2600	schtasks.exe
3032	schtasks.exe
2956	schtasks.exe
2232	schtasks.exe
2660	schtasks.exe
756	schtasks.exe
2444	schtasks.exe
2032	schtasks.exe
2468	schtasks.exe
2228	schtasks.exe
1072	schtasks.exe
2004	schtasks.exe
2692	schtasks.exe
2104	schtasks.exe
1664	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1508	chainMonitor.exe
936	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1508	chainMonitor.exe
Token: SeDebugPrivilege	936	Idle.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 2744	1852	11DA048860021B6C22E171032E48B023.exe	30
PID 1852 wrote to memory of 2744	1852	11DA048860021B6C22E171032E48B023.exe	30
PID 1852 wrote to memory of 2744	1852	11DA048860021B6C22E171032E48B023.exe	30
PID 1852 wrote to memory of 2744	1852	11DA048860021B6C22E171032E48B023.exe	30
PID 2744 wrote to memory of 2804	2744	WScript.exe	31
PID 2744 wrote to memory of 2804	2744	WScript.exe	31
PID 2744 wrote to memory of 2804	2744	WScript.exe	31
PID 2744 wrote to memory of 2804	2744	WScript.exe	31
PID 2804 wrote to memory of 1508	2804	cmd.exe	33
PID 2804 wrote to memory of 1508	2804	cmd.exe	33
PID 2804 wrote to memory of 1508	2804	cmd.exe	33
PID 2804 wrote to memory of 1508	2804	cmd.exe	33
PID 1508 wrote to memory of 936	1508	chainMonitor.exe	62
PID 1508 wrote to memory of 936	1508	chainMonitor.exe	62
PID 1508 wrote to memory of 936	1508	chainMonitor.exe	62

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\11DA048860021B6C22E171032E48B023.exe
"C:\Users\Admin\AppData\Local\Temp\11DA048860021B6C22E171032E48B023.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1852
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockrefSessionBrokerDll\5sVJrvWE.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2744
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2804
  - - C:\blockrefSessionBrokerDll\chainMonitor.exe
      "C:\blockrefSessionBrokerDll\chainMonitor.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1508
    - - C:\Program Files\VideoLAN\VLC\Idle.exe
        
        "C:\Program Files\VideoLAN\VLC\Idle.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 10 /tr "'C:\Windows\TAPI\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\TAPI\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 10 /tr "'C:\Windows\TAPI\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1072

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 13 /tr "'C:\Program Files\VideoLAN\VLC\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2224

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 13 /tr "'C:\Program Files\VideoLAN\VLC\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Uninstall Information\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Uninstall Information\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Uninstall Information\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Reference Assemblies\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2360

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Reference Assemblies\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2740

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 7 /tr "'C:\blockrefSessionBrokerDll\lsm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsml" /sc MINUTE /mo 5 /tr "'C:\blockrefSessionBrokerDll\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2004

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Microsoft Office\CLIPART\Publisher\Backgrounds\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Office\CLIPART\Publisher\Backgrounds\csrss.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 "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft Office\CLIPART\Publisher\Backgrounds\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Mail\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2408

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Mail\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2444

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\MSOCache\All Users\{90140000-00BA-0409-0000-0000000FF1CE}-C\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1732

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

Replay Monitor

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Downloads

C:\blockrefSessionBrokerDll\5sVJrvWE.vbe

Filesize
229B

MD5
7533c94864b144aa157dbd00f03e9871

SHA1
807bad6d8cb143e2fac7ec32a6e07a4016af308d

SHA256
1dceabad90f9b4e74e59d62eebbc86662708d2c28761074e8b4fd73aa73f60aa

SHA512
3d536e931dadb7d6efc079fc9ff336ee4f2c7a291fcd1df7139c565e74d73e4c12745b886dbb746f060cd46c36cb3d774bc2b9f3a5407a737cb94ac44ed70f8c

Download Submit
C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat

Filesize
46B

MD5
6f0b3744c91bc8641c6cef0ae9be66b5

SHA1
5e45aef1422d839f27a9e73b395c58eeab7ae476

SHA256
6442de1cdf0bf9500de8b74c00506a7d84193b3780f9242f55497335526aad5c

SHA512
97089e966a4969391aa2fa10d0693c103a16eea70bfbc01481ecda46ae6953e3a25abf3034500e275cc60e0e8de6f95435b2ba2c9df2cda5bf58685af4cba8e0

Download Submit
\blockrefSessionBrokerDll\chainMonitor.exe

Filesize
828KB

MD5
f6b809fa6bd0e72435fab78e9744ccd7

SHA1
52749158484cf20a6511fcd36fda0e8100ebe316

SHA256
af8a81f4387ba5ebe96f5111d56b65585c194602e5bd147997eab1b6e28ae7b2

SHA512
12c63edcd1f347b519da80c814fcf3640294fdbd2482a7be4da4d20f8f5d785d2e97f784df39ad28b317d2db3cc43d904c5584fc9eea2c1f1df01b999362adf9

Download Submit
memory/936-38-0x0000000001360000-0x0000000001436000-memory.dmp

Filesize
856KB

Download
memory/1508-13-0x0000000000940000-0x0000000000A16000-memory.dmp

Filesize
856KB

Download