dcrat | e0663c567d2eb0a820e22f4f2cf2a728c911e14dbb5aa054e6d24904b4e3ca4e

General

Target

buildchecker1.exe
Size

1.1MB
MD5

ee4839dcc8cf148ce959f4d238f5d696
SHA1

ea27026af975bf81febf24f872b722c19544c0be
SHA256

e0663c567d2eb0a820e22f4f2cf2a728c911e14dbb5aa054e6d24904b4e3ca4e
SHA512

65cbba7b3c2f89a95a38e9e21386084d6fb57162ed34010feae03cb00051537663cfc78475810b123427db6e063a53a9b08170f5aed869d34fd4295c84021093
SSDEEP

12288:aRZ+IoG/n9IQxW3OBsee2X+t4Rbi0tJzEkissVIoXor9ayjhvegiVW9mSYG1sP+c:U2G/nvxW3Ww0tFwkismobjwSYGqAa

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

Process spawned unexpected child process 18 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	2856	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2904	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2796	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2740	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2592	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2720	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2216	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2304	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1428	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1568	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1980	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1756	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2028	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1940	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1736	2760	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1532	2760	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0007000000018736-10.dat	dcrat
behavioral1/memory/1964-13-0x0000000000F60000-0x0000000001036000-memory.dmp	dcrat
behavioral1/memory/1720-33-0x0000000001340000-0x0000000001416000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1964	bridgecontainerRef.exe
1720	Idle.exe

Loads dropped DLL 2 IoCs

pid	Process
2928	cmd.exe
2928	cmd.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\wininit.exe	bridgecontainerRef.exe
File created	C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\56085415360792	bridgecontainerRef.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\debug\WIA\System.exe	bridgecontainerRef.exe
File created	C:\Windows\debug\WIA\27d1bcfc3c54e0	bridgecontainerRef.exe
File created	C:\Windows\ServiceProfiles\NetworkService\Videos\wininit.exe	bridgecontainerRef.exe
File opened for modification	C:\Windows\ServiceProfiles\NetworkService\Videos\wininit.exe	bridgecontainerRef.exe
File created	C:\Windows\ServiceProfiles\NetworkService\Videos\56085415360792	bridgecontainerRef.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	buildchecker1.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2304	schtasks.exe
1568	schtasks.exe
1756	schtasks.exe
2856	schtasks.exe
2712	schtasks.exe
1532	schtasks.exe
2592	schtasks.exe
2216	schtasks.exe
1940	schtasks.exe
1736	schtasks.exe
2904	schtasks.exe
2796	schtasks.exe
2740	schtasks.exe
2720	schtasks.exe
1428	schtasks.exe
1980	schtasks.exe
2032	schtasks.exe
2028	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1964	bridgecontainerRef.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe
1720	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1964	bridgecontainerRef.exe
Token: SeDebugPrivilege	1720	Idle.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 2320	2968	buildchecker1.exe	30
PID 2968 wrote to memory of 2320	2968	buildchecker1.exe	30
PID 2968 wrote to memory of 2320	2968	buildchecker1.exe	30
PID 2968 wrote to memory of 2320	2968	buildchecker1.exe	30
PID 2320 wrote to memory of 2928	2320	WScript.exe	32
PID 2320 wrote to memory of 2928	2320	WScript.exe	32
PID 2320 wrote to memory of 2928	2320	WScript.exe	32
PID 2320 wrote to memory of 2928	2320	WScript.exe	32
PID 2928 wrote to memory of 1964	2928	cmd.exe	34
PID 2928 wrote to memory of 1964	2928	cmd.exe	34
PID 2928 wrote to memory of 1964	2928	cmd.exe	34
PID 2928 wrote to memory of 1964	2928	cmd.exe	34
PID 1964 wrote to memory of 1988	1964	bridgecontainerRef.exe	54
PID 1964 wrote to memory of 1988	1964	bridgecontainerRef.exe	54
PID 1964 wrote to memory of 1988	1964	bridgecontainerRef.exe	54
PID 1988 wrote to memory of 1920	1988	cmd.exe	56
PID 1988 wrote to memory of 1920	1988	cmd.exe	56
PID 1988 wrote to memory of 1920	1988	cmd.exe	56
PID 1988 wrote to memory of 1720	1988	cmd.exe	57
PID 1988 wrote to memory of 1720	1988	cmd.exe	57
PID 1988 wrote to memory of 1720	1988	cmd.exe	57

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\buildchecker1.exe
"C:\Users\Admin\AppData\Local\Temp\buildchecker1.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2968
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Containernet\r3KdEjt.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2320
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Containernet\RF2hvkHZrszbP0k.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2928
  - - C:\Containernet\bridgecontainerRef.exe
      "C:\Containernet\bridgecontainerRef.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:1964
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ITcwZ43zXP.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1988
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1920
      - C:\MSOCache\All Users\Idle.exe
        
        "C:\MSOCache\All Users\Idle.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Windows\ServiceProfiles\NetworkService\Videos\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\ServiceProfiles\NetworkService\Videos\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2904

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Windows\ServiceProfiles\NetworkService\Videos\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2740

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2592

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 9 /tr "'C:\Containernet\OSPPSVC.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Containernet\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 14 /tr "'C:\Containernet\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\Windows\debug\WIA\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1428

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\debug\WIA\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Windows\debug\WIA\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\MSOCache\All Users\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\MSOCache\All Users\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\Recovery\2b7a8ca2-3d6d-11ef-81ce-f2a3cf4ad94f\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\2b7a8ca2-3d6d-11ef-81ce-f2a3cf4ad94f\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 13 /tr "'C:\Recovery\2b7a8ca2-3d6d-11ef-81ce-f2a3cf4ad94f\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1532

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Containernet\RF2hvkHZrszbP0k.bat

Filesize
40B

MD5
a85467e4f1d1f99e96e9590c355d42f2

SHA1
398ac3ea16a11a8a2957a5ef4143d472e5cfc294

SHA256
046e64c151f66ef0f72682fa16c83309790478eeaa0d7621ea324b4221e85903

SHA512
1a718a6040863d596326d1a7e0f81307d69d1287c4b03767f1a83ebf31f860b3e2a545b44f358a47cac4500b4ecdf9e9c15f8ec46de7335606eaa72b7eaf672a

Download Submit
C:\Containernet\bridgecontainerRef.exe

Filesize
828KB

MD5
6afa3e281b7634f49b96825bb400bc5a

SHA1
fee8aa25a2db0a2eec530345a3955ab5c16050bf

SHA256
29e76ed158c096cd29f1b2d5fcfc838e1034ca2ea35ed66c51490f9bf409a7b1

SHA512
913cecf27e7b99c2b0326c1647a25ce71dd31af8f4e1854b6dc4acd4f87125455b7288b7f9e59d44512bc713a0e2941ddcf6395922af011a3aa71fb48ae2e605

Download Submit
C:\Containernet\r3KdEjt.vbe

Filesize
204B

MD5
8952fed62096fc946fc4ff2231ae0277

SHA1
437591c439dc3da24fbb7ca97cc57e2b37027183

SHA256
54c44a2c1291a654f1fe103fb47ba51e164a7d36221b28282ec01eba06ec5aa4

SHA512
5fd0750db4a66187736760347987108ba81caa3771d8c20dee3fec57b133c1b5b892a65c3e78b6e88958c308d7e98011ac4cb6af63c345b29882f72f75de3d12

Download Submit
C:\Users\Admin\AppData\Local\Temp\ITcwZ43zXP.bat

Filesize
195B

MD5
82b349e0e3b1cfe75888a22dd6e6e88a

SHA1
6194c63498b1f4d4621576a2982ffcc2c7372b78

SHA256
853ed580710cdd3d9fc596c4cbdd657bb5e778faff92a3d394d6e32dafd3b3e0

SHA512
2cfcfee7fef756fac94b3b6307cb8cd19550ea1f505fa493dd754cc38165d9d94ca39305ca21752b10f57b5c27b5eb9cc7eee475cfda45e40e70216f43338deb

Download Submit
memory/1720-33-0x0000000001340000-0x0000000001416000-memory.dmp

Filesize
856KB

Download
memory/1964-13-0x0000000000F60000-0x0000000001036000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads